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Effects of pre-precipitation of Cr_2N on microstructures and properties of high nitrogen stainless steel 被引量:5
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作者 李静媛 刘慧男 黄佩武 《Journal of Central South University》 SCIE EI CAS 2012年第5期1189-1195,共7页
Aging precipitation and solid solution heat treatment were carried out on three steels which have chromium content of 18%, manganese content of 12%, 15%, 18%, and nitrogen content of 0.43%, 0.53%, 0.67%, respectively.... Aging precipitation and solid solution heat treatment were carried out on three steels which have chromium content of 18%, manganese content of 12%, 15%, 18%, and nitrogen content of 0.43%, 0.53%, 0.67%, respectively. The mechanisms of precipitation and solid solution of high nitrogen anstenitic stainless steel were studied using the scanning electron microscopy, transmission electron microscopy, electron probe micro analysis and mechanical testing. The results show that, Cr2N is the primary precipitate in the tested stainless steels instead of Cr23C6. Cr2N nucleates at austenitic grain boundaries and grows towards inner grains with a lameUar morphology. By means of pre-precipitation of Cr2N at 800 ~C, the microstructure of the steels at solid solution state can be refined, thus improving the strength and plasticity. After the proposed treatment, the tensile strength, the proof strength and the elongation of the tested steel reach 881 MPa, 542 MPa and 54%, respectively. 展开更多
关键词 Cr2N PRECIPITATION REFINEMENT high nitrogen stainless steel (HNSS)
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Gas metal arc welding of high nitrogen stainless steel with AreN_(2)-O_(2)ternary shielding gas 被引量:2
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作者 Zeng Liu Cheng-lei Fan +5 位作者 Zhu Ming Chao Chen Ang Liu Chun-li Yang San-bao Lin Lang-ping Wang 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第3期923-931,共9页
High nitrogen stainless steel with nitrogen content of 0.75%was welded by gas metal arc welding with Ar-N_(2)-O_(2)ternary shielding gas.The effect of the ternary shielding gas on the retention and improvement of nitr... High nitrogen stainless steel with nitrogen content of 0.75%was welded by gas metal arc welding with Ar-N_(2)-O_(2)ternary shielding gas.The effect of the ternary shielding gas on the retention and improvement of nitrogen content in the weld was identified.Surfacing test was conducted first to compare the ability of O_(2)and CO_(2)in prompting nitrogen dissolution.The nitrogen content of the surfacing metal with O_(2)is slightly higher than CO_(2).And then AreN_(2)-O_(2)shielding gas was applied to weld high nitrogen stainless steel.After using N_(2)-containing shielding gas,the nitrogen content of the weld was improved by 0.1 wt%.As N_(2)continued to increase,the increment of nitrogen content was not obvious,but the ferrite decreased from the top to the bottom.When the proportion of N_(2)reached 20%,a full austenitic weld was obtained and the tensile strength was improved by 8.7%.Combined with the results of surfacing test and welding test,it is concluded that the main effect of N_(2)is to inhibit the escape of nitrogen and suppress the nitrogen diffusion from bottom to the top in the molten pool. 展开更多
关键词 high nitrogen stainless steel AreN2-O2 shielding gas Action mechanism
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Welding of nickel free high nitrogen stainless steel: Microstructure and mechanical properties 被引量:14
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作者 Raffi Mohammed G.Madhusudhan Reddy K.Srinivasa Rao 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2017年第2期59-71,共13页
High nitrogen stainless steel(HNS) is a nickel free austenitic stainless steel that is used as a structural component in defence applications for manufacturing battle tanks as a replacement of the existing armour grad... High nitrogen stainless steel(HNS) is a nickel free austenitic stainless steel that is used as a structural component in defence applications for manufacturing battle tanks as a replacement of the existing armour grade steel owing to its low cost, excellent mechanical properties and better corrosion resistance.Conventional fusion welding causes problems like nitrogen desorption, solidification cracking in weld zone, liquation cracking in heat affected zone, nitrogen induced porosity and poor mechanical properties.The above problems can be overcome by proper selection and procedure of joining process. In the present work, an attempt has been made to correlate the microstructural changes with mechanical properties of fusion and solid state welds of high nitrogen steel. Shielded metal arc welding(SMAW), gas tungsten arc welding(GTAW), electron beam welding(EBW) and friction stir welding(FSW) processes were used in the present work. Optical microscopy, scanning electron microscopy and electron backscatter diffraction were used to characterize microstructural changes. Hardness, tensile and bend tests were performed to evaluate the mechanical properties of welds. The results of the present investigation established that fully austenitic dendritic structure was found in welds of SMAW. Reverted austenite pools in the martensite matrix in weld zone and unmixed zones near the fusion boundary were observed in GTA welds. Discontinuous ferrite network in austenite matrix was observed in electron beam welds.Fine recrystallized austenite grain structure was observed in the nugget zone of friction stir welds.Improved mechanical properties are obtained in friction stir welds when compared to fusion welds. This is attributed to the refined microstructure consisting of equiaxed and homogenous austenite grains. 展开更多
关键词 high nitrogen AUSTENITIC stainless steel(HNS) Shielded metal ARC WELDING (SMAW) Gas tungsten ARC WELDING (GTAW) Electron beam WELDING (EBW) Friction stir WELDING (FSW)
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Microstructure and pitting corrosion of shielded metal arc welded high nitrogen stainless steel 被引量:8
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作者 RAFFI MOHAMMED G.MADHUSUDHAN REDDY K.SRINIVASA RAO 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2015年第3期237-243,共7页
The present work is aimed at studying the microstructure and pitting corrosion behaviour of shielded metal arc welded high nitrogen steel made of Cromang-N electrode. Basis for selecting this electrode is to increase ... The present work is aimed at studying the microstructure and pitting corrosion behaviour of shielded metal arc welded high nitrogen steel made of Cromang-N electrode. Basis for selecting this electrode is to increase the solubility of nitrogen in weld metal due to high chromium and manganese content. Microscopic studies were carried out using optical microscopy(OM) and field emission scanning electron microscopy(FESEM). Energy back scattered diffraction(EBSD) method was used to determine the phase analysis, grain size and orientation image mapping. Potentio-dynamic polarization testing was carried out to study the pitting corrosion resistance in aerated 3.5% NaCl environment using a GillAC electrochemical system. The investigation results showed that the selected Cr-Mn-N type electrode resulted in a maximum reduction in delta-ferrite and improvement in pitting corrosion resistance of the weld zone was attributed to the coarse austenite grains owing to the reduction in active sites of the austenite/delta ferrite interface and the decrease in galvanic interaction between austenite and delta-ferrite. 展开更多
关键词 耐点蚀性能 高氮不锈钢 焊缝金属 电弧焊接 研究组织 屏蔽 场发射扫描电子显微镜 奥氏体晶粒
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Pitting corrosion and crevice corrosion behaviors of high nitrogen austenitic stainless steels 被引量:16
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作者 Hua-bing Li Zhou-hua Jiang Yan Yang Yang Cao Zu-rui Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第5期517-524,共8页
Pitting corrosion and crevice corrosion behaviors of high nitrogen austenitic stainless steels (HNSS) were investigated by electrochemical and immersion testing methods in chloride solution, respectively. The chemic... Pitting corrosion and crevice corrosion behaviors of high nitrogen austenitic stainless steels (HNSS) were investigated by electrochemical and immersion testing methods in chloride solution, respectively. The chemical constitution and composition in the depth of passive films formed on HNSS were analyzed by X-ray photoelectron spectrum (XPS). HNSS has excellent pitting and crevice corrosion resistance compared to 316L stainless steel. With increasing the nitrogen content in steels, pitting potentials and critical pitting temperature (CPT) increase, and the maximum, average pit depths and average weight loss decrease. The CPT of HNSS is correlated with the alloying element content through the measure of alloying for resistance to corrosion (MARC). The MARC can be expressed as an equation of CPT=2.55MARC-29. XPS results show that HNSS exhibiting excellent corrosion resistance is attributed to the enrichment of nitrogen on the surface of passive films, which forms ammonium ions increasing the local pH value and facilitating repassivation, and the synergistic effects of molybdenum and nitrogen. 展开更多
关键词 high nitrogen austenitic stainless steel pitting corrosion crevice corrosion nitrogen critical pitting temperature syner-gistic effect
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High Nitrogen Austenitic Stainless Steels Manufactured by Nitrogen Gas Alloying and Adding Nitrided Ferroalloys 被引量:15
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作者 LI Hua-bing JIANG Zhou-hua SHEN Ming-hui YOU Xiang-mi 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2007年第3期63-68,共6页
A simple and feasible method for the production of high nitrogen austenitic stainless steels involves nitrogen gas alloying and adding nitrided ferroalloys under normal atmospheric conditions. Alloying by nitrogen gas... A simple and feasible method for the production of high nitrogen austenitic stainless steels involves nitrogen gas alloying and adding nitrided ferroalloys under normal atmospheric conditions. Alloying by nitrogen gas bubbling in Fe-Cr-Mn-Mo series alloys was carried out in MoSi2 resistance furnace and air induction furnace under normal atmospheric conditions. The results showed that nitrogen alloying could be accelerated by increasing nitrogen gas flow rate, prolonging residence time of bubbles, increasing gas/molten steel interfaces, and decreasing the sulphur and oxygen contents in molten steel. Nitrogen content of 0.69% in 18Crl8Mn was obtained using air induction furnace by bubbling of nitrogen gas from porous plug. In addition, the nickel-free, high nitrogen austenitic stainless steels with sound and compact macrostructure had been produced in the laboratory using vacuum induction furnace and electroslag remelting furnace under nitrogen atmosphere by the addition of nitrided alloy with the maximum nitrogen content of 0.81%. Pores were observed in the ingots obtained by melting and casting in vacuum induction furnace with the addition of nitrided ferroalloys and under nitrogen atmosphere. After electroslag remelting of the cast ingots, they were all sound and were free of pores. The yield of nitrogen increased with the decrease of melting rate in the ESR process. Due to electroslag remelting under nitrogen atmosphere and the consequential addition of aluminum as deoxidizer to the slag, the loss of manganese decreased obviously. There existed mainly irregular Al2O3 inclusions and MnS inclusions in ESR ingots, and the size of most of the inclusions was less than 5 um. After homogenization of the hot rolled plate at 1 150℃ × 1 h followed by water quenching, the microstructure consisted of homogeneous austenite. 展开更多
关键词 nitrogen gas alloying nitrided ferroalloy high nitrogen austenitic stainless steel vacuum induction melting electroslag remelting
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Fabrication of high nitrogen austenitic stainless steels with excellent mechanical and pitting corrosion properties 被引量:11
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作者 Hua-bing Li Zhou-hua Jiang Yang Cao Zu-rui Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第4期387-392,共6页
A series of high nitrogen austenitic stainless steels were successfully developed with a pressurized electroslag remelting furnace. Nitride additives and deoxidizer were packed into the stainless steel pipes, and then... A series of high nitrogen austenitic stainless steels were successfully developed with a pressurized electroslag remelting furnace. Nitride additives and deoxidizer were packed into the stainless steel pipes, and then the stainless steel pipes were welded on the surface of an electrode with low nitrogen content to prepare a compound electrode. Using Si3N4 as a nitrogen alloying source, the silicon contents in the ingots were prone to be out of the specification range, the electric current fluctuated greatly and the surface qualities of the ingots were poor. The surface qualities of the ingots were improved with FeCrN as a nitrogen alloying source. The sound and compact macrostructure ingot with the maximum nitrogen content of 1.21wt% can be obtained. The 18Cr18Mn2Mo0.9N high nitrogen austenitic stainless steel exhibits high strength and good ductility at room temperature. The steel shows typical ductile-brittle transition behavior and excellent pitting corrosion resistance properties. 展开更多
关键词 high nitrogen austenitic stainless steels electroslag remelting nitrogen alloying ductile-brittle transition pitting corrosion resistance
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Intergranular corrosion behavior of high nitrogen austenitic stainless steel 被引量:6
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作者 Hua-bing Li Zhou-hua Jiang Zu-rui Zhang Yang Cao Yan Yang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第6期654-660,共7页
The intergranular corrosion (IGC) behavior of high nitrogen austenitic stainless steel (HNSS) sensitization treated at 650-950℃ was investigated by the double loop electrochemical potentiodynamic reactivation (D... The intergranular corrosion (IGC) behavior of high nitrogen austenitic stainless steel (HNSS) sensitization treated at 650-950℃ was investigated by the double loop electrochemical potentiodynamic reactivation (DL-EPR) method. The effects of the electrolytes, scan rate, sensitizing temperature on the susceptibility to IGC of HNSS were examined. The results show that the addi-tion of NaCl is an effective way to improve the formation of the cracking of a passive film in chromium-depleted zones during the reactivation scan. Decreasing the scan rate exhibits an obvious effect on the breakdown of the passive film. A solution with 2 mol/L H2SO4+1 mol/L NaCl+0.01 mol/L KSCN is suitable to check the susceptibility to IGC of HNSS at a sensitizing temperature of 650-950℃ at a suitable scan rate of 1.667 mV/s. Chromium depletion of HNSS is attributed to the precipitation of Cr2N which results in the susceptibility to IGC. The synergistic effect of Mo and N is suggested to play an important role in stabilizing the passive film to prevent the attack of IGC. 展开更多
关键词 intergranular corrosion high nitrogen austenitic stainless steel SENSITIZATION passive film chromium depletion
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Effect of heat-input on pitting corrosion behavior of friction stir welded high nitrogen stainless steel 被引量:8
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作者 H.Zhang P.Xue +4 位作者 D.Wang L.H.Wu D.R.Ni B.L.Xiao Z.Y.Ma 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第7期1278-1283,共6页
In this study, different welding param eters were selected to investigate the effects of heat-in put on the microstructure and corrosion resistance of the friction stir welded high nitrogen stainless steel joints. The... In this study, different welding param eters were selected to investigate the effects of heat-in put on the microstructure and corrosion resistance of the friction stir welded high nitrogen stainless steel joints. The results show ed that, the welding speed had major influence on the duration at elevated tem perature rather than the peak tem perature. The hardness distribution and tensile properties of the nugget zones (NZs) for various joints were very similar while the pitting corrosion behavior of various NZs showed major differences. Large heat-input resulted in the ferrite bands being the pitting location, while tool wear bands were sensitive to pitting corrosion in the low heat-input joints. Cr diffusion and tool wear were the main reasons for pitting. The mechanisms of pitting corrosion in the NZs were analyzed in detail. 展开更多
关键词 high nitrogen stainless steel FRICTION STIR welding Mechanical properties Corrosion resistance Heat-input
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Effects of cold rolling deformation on microstructure,hardness,and creep behavior of high nitrogen austenitic stainless steel 被引量:2
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作者 孙世成 孙贵训 +3 位作者 江忠浩 季长涛 刘家安 连建设 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第2期379-384,共6页
Effects of cold rolling deformation on the microstructure, hardness, and creep behavior of high nitrogen austenitic stainless steel (HNASS) are investigated. Microstructure characterization shows that 70% cold rolli... Effects of cold rolling deformation on the microstructure, hardness, and creep behavior of high nitrogen austenitic stainless steel (HNASS) are investigated. Microstructure characterization shows that 70% cold rolling deformation results in significant refinement of the microstructure of this steel, with its average twin thickness reducing from 6.4 μm to 14 nm. Nanoindentation tests at different strain rates demonstrate that the hardness of the steel with nano-scale twins (nt-HNASS) is about 2 times as high as that of steel with micro-scale twins (mt-HNASS). The hardness of nt-HNASS exhibits a pronounced strain rate dependence with a strain rate sensitivity (m value) of 0.0319, which is far higher than that of mt-HNASS (m = 0.0029). nt-HNASS shows more significant load plateaus and a higher creep rate than mt-HNASS. Analysis reveals that higher hardness and larger m value of nt-HNASS arise from stronger strain hardening role, which is caused by the higher storage rate of dislocations and the interactions between dislocations and high density twins. The more significant load plateaus and higher creep rates of nt-HNASS are due to the rapid relaxation of the dislocation structures generated during loading. 展开更多
关键词 high nitrogen austenitic stainless steel cold deformation nanoindentation tests creep behavior
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Precipitates in an isothermally aged Fe-18Cr-12Mn-0.04C-0.48N high-nitrogen austenitic stainless steel 被引量:1
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作者 SHI Feng,WANG Lijun,CUI Wenfang,REN Yuping,LI Hongxiao,and LIU Chunming School of Materials & Metallurgy,Northeastern University,Shenyang 110004,China 《Rare Metals》 SCIE EI CAS CSCD 2007年第S1期185-190,共6页
Vertical section of Fe-18Cr-12Mn-0.04C-N system phase diagram varying with nitrogen content at 1×105 Pa was calculated using Thermo-Calc software and thermodynamic database.The morphology and crystallography info... Vertical section of Fe-18Cr-12Mn-0.04C-N system phase diagram varying with nitrogen content at 1×105 Pa was calculated using Thermo-Calc software and thermodynamic database.The morphology and crystallography information of precipitates in Fe-18Cr-12Mn-0.04C-0.48N high-nitrogen austenitic stainless steel during isothermal aging at 800 ℃ after austenization was investigated using optical microscopy(OM),and transmission electron microscopy(TEM) with energy distribution spectrum(EDS).The experimental results show that three precipitates,(Cr,Fe,Mn)2(N,C),(Cr,Fe,Mn)23(C,N)6 and σ phase exist in this steel,which is consistent with the thermodynamic calculation,indicating that thermodynamic calculation can provide instructions for alloy composition design,heat treatment and prediction of precipitation sequence in Fe-18Cr-12Mn-0.04C-N system. 展开更多
关键词 PRECIPITATE isothermal aging thermodynamic calculation phase diagram high nitrogen austenitic stainless steel
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Influence of chemical composition and cold deformation on aging precipitation behavior of high nitrogen austenitic stainless steels 被引量:1
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作者 李花兵 姜周华 +2 位作者 冯浩 朱红春 张祖瑞 《Journal of Central South University》 SCIE EI CAS 2013年第12期3354-3362,共9页
The influence of chemical composition and cold deformation on aging precipitation behavior of 18Cr-16Mn-2Mo-I.IN (HNS-A), 18Cr-16Mn-I.3N (HNS-B), 18Cr-18Mn-2Mo-0.96N (HNS-C) and 18Cr-18Mn-2Mo-0.77N (I-INS-D) h... The influence of chemical composition and cold deformation on aging precipitation behavior of 18Cr-16Mn-2Mo-I.IN (HNS-A), 18Cr-16Mn-I.3N (HNS-B), 18Cr-18Mn-2Mo-0.96N (HNS-C) and 18Cr-18Mn-2Mo-0.77N (I-INS-D) high nitrogen austenitic stainless steels was investigated. The results show that the "nose" temperatures and incubation periods of the initial time-temperature-precipitation (TTP) curves of aged HNSs are found to be 850 ℃, 60 s; 850 ℃, 45 s; 850 ℃, 60 s and 900 ℃, 90 s, respectively. Based on the analysis of SAD patterns, the coarse cellular Cr2N precipitate which presents a lamellar structure has a hexagonal structure of a=0.478 nm and c=0.444 nm. The Z phase corresponding to a composition of Fe36Cr^2Mo10, is determined to be a body-centered cubic structure ofa=0.892 nm. The precipitating sensitivity presents no more difference with the nitrogen content increasing from 0.77% to 0.96%, but exhibits so obviously that the cellular precipitates nearly overspread the whole field. The addition of Mo element can restrain the TTP curves moving left and down, which means decreasing the sensitivity of aging precipitation. With increasing the cold deformation, the sensitivity of precipitation increases obviously. 展开更多
关键词 high nitrogen austenitic stainless steel aging precipitation time-temperature-precipitation curve chemical composition cold deformation
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PRECIPITATION BEHAVIOR OF M_(2)N IN A HIGH-NITROGEN AUSTENITIC STAINLESS STEEL DURING ISOTHERMAL AGING 被引量:6
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作者 F. Shi L.J. Wang W.F. Cui C.M. Liu 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2007年第2期95-101,共7页
The precipitation behavior of M2N and the microstructural evolution in a Cr-Mn austenitic stainless steel with a high nitrogen content of 0.43mass% during isothermal aging has been investigated using optical microsco... The precipitation behavior of M2N and the microstructural evolution in a Cr-Mn austenitic stainless steel with a high nitrogen content of 0.43mass% during isothermal aging has been investigated using optical microscopy ( OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The aging treatments have led to the decomposition of nitrogen supersaturated austenitic matrix through discontinuous cellular precipitation. The precipitated cells comprise alternate lamellae of M2N precipitate and austenitic matrix. This kind of precipitate morphology is similar to that of pearlite. However, owing to the non-eutectoidic mechanism of the reaction, the growth characteristic of the cellular precipitates is different from that of pearlite in Fe-C binary alloys. M2N precipitate in the cell possesses a hexagonal crystal structure with the parameters a = 0.4752nm and c = 0.4429nm, and the orientation relationship between the M2V precipitates and austenite determined from the SADP is [01^-10]M2N//[101]γ, [2^-1^-10]M2N//[010]γ. 展开更多
关键词 austenitic stainless steel high nitrogen microstructureisothermal aging PRECIPITATION
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On the Plasma (ion) Carburized Layer of High Nitrogen Austenitic Stainless Steel 被引量:1
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作者 Y. Ueda N. Kanayama +2 位作者 K. Ichii T. Oishi H. Miyake 《材料热处理学报》 EI CAS CSCD 北大核心 2004年第5期375-377,共3页
The manganese concentration of austenitic stainless steel decreases from the inner layer towards the surface of the plasma (ion) carburized layer due to the evaporation of manganese from the specimen surface. The carb... The manganese concentration of austenitic stainless steel decreases from the inner layer towards the surface of the plasma (ion) carburized layer due to the evaporation of manganese from the specimen surface. The carbon concentration in the carburized layer is influenced by alloyed elements such as Cr, Ni, Si, and Mo, as well as Nitrogen. This study examined the effects of nitrogen on the properties of the carburized layer of high nitrogen stainless steel. Plasma (ion) carburizing was carried out for 14.4 ks at 1303 K in an atmosphere of CH4+H2 gas mixtures under a pressure of 350 Pa. The plasma carburized layer of the high nitrogen stainless steel was thinner than that of an austentric stainless steel containing no nitrogen. This suggested that the nitrogen raised the activity of carbon in the plasma carburized layer, GDOES measurement indicated that the nitrogen level in the layer did not vary after plasma (ion) carburizing. 展开更多
关键词 等离子渗碳 高氮不锈钢 奥氏体 GDOES
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Aging precipitation and recrystallization in high-nitrogen austenitic stainless steel 被引量:1
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作者 石锋 王立军 +2 位作者 崔文芳 祁阳 刘春明 《中国有色金属学会会刊:英文版》 CSCD 2009年第S3期569-572,共4页
The interaction between precipitation and recrystallization in cold deformed Fe-18Cr-12Mn-0.48N high-nitrogen austenitic stainless steel was investigated by means of hardness test, optical microscopy (OM) and transmis... The interaction between precipitation and recrystallization in cold deformed Fe-18Cr-12Mn-0.48N high-nitrogen austenitic stainless steel was investigated by means of hardness test, optical microscopy (OM) and transmission electron microscopy (TEM). The results show that the recrystallization of the steel begins at about 750℃ . When aging at 750℃ , the precipitation occurs prior to recrystallization. Large numbers of the second phases nucleate in dislocation, grain boundary and subgrain boundary. Precipitation of the second-phase particles hinders the formation of recrystallization nucleus. 展开更多
关键词 high-nitrogen AUSTENITIC stainless steel aging precipitation RECRYSTALLIZATION
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Preparation of high nitrogen and nickel-free austenitic stainless steel by powder injection molding 被引量:2
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作者 Dawei Cui Junsheng Jiang +2 位作者 Guangming Cao Enzhong Xiao Xuanhui Qu 《Journal of University of Science and Technology Beijing》 CSCD 2008年第2期150-154,共5页
High nitrogen and nickel-free austenitic stainless steel has received much recognition worldwide because it can solve the problem of "nickel-allergy" and has outstanding mechanical and physical properties. In this a... High nitrogen and nickel-free austenitic stainless steel has received much recognition worldwide because it can solve the problem of "nickel-allergy" and has outstanding mechanical and physical properties. In this article, 0Cr17Mn11Mo3N was prepared by powder injection molding (PIM) technique accompanied with solid-nitriding. The results show that the critical solid loading can achieve up to 64vol% by use of gas-atomized powders with the average size of 17.4 μm. The optimized sintefing conditions are determined to be 1300℃,2 h in flowing nitrogen atmosphere, at which the relative density reaches to 99% and the N content is as high as 0.78wt%. After solution annealing at 1150℃for 90 rain and water quench, the 0.2% yield strength, ultimate tensile strength (UTS), elongation, reduction in area, and hardness can reach as high as 580 MPa, 885 MPa, 26.0%, 29.1%, and Hv 222, respectively. 展开更多
关键词 high nitrogen steel powder injection molding (PIM) stainless steel mechanical properties
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Strain rate and cold rolling dependence of tensile strength and ductility in high nitrogen nickel-free austenitic stainless steel 被引量:1
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作者 孙贵训 江月 +4 位作者 张晓茹 孙世成 江忠浩 王文权 连建设 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第9期341-349,共9页
The tensile strength and ductility of a high nitrogen nickel-free austenitic stainless steel with solution and cold rolling treatment were investigated by performing tensile tests at different strain rates and at room... The tensile strength and ductility of a high nitrogen nickel-free austenitic stainless steel with solution and cold rolling treatment were investigated by performing tensile tests at different strain rates and at room temperature. The tensile tests demonstrated that this steel exhibits a significant strain rate and cold rolling dependence of the tensile strength and ductility.With the increase of the strain rate from 10^-4s^-1to 1 s^-1, the yield strength and ultimate tensile strength increase and the uniform elongation and total elongation decrease. The analysis of the double logarithmic stress–strain curves showed that this steel exhibits a two-stage strain hardening behavior, which can be well examined and analyzed by using the Ludwigson equation. The strain hardening exponents at low and high strain regions(n2and n1) and the transition strain(εL) decrease with increasing strain rate and the increase of cold rolling RA. Based on the analysis results of the stress–strain curves, the transmission electron microscopy characterization of the microstructure and the scanning electron microscopy observation of the deformation surfaces, the significant strain rate and cold rolling dependence of the strength and ductility of this steel were discussed and connected with the variation in the work hardening and dislocation activity with strain rate and cold rolling. 展开更多
关键词 high nitrogen nickel-free austenitic stainless steel cold rolling Ludwigson equation tensile strength and ductility
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Mechanical Properties and Microstructure Evolution of Cold-deformed High-nitrogen Nickel-free Austenitic Stainless Steel during Annealing
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作者 徐明舟 刘春明 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第5期830-835,共6页
The mechanical properties and microstructure evolution of cold-deformed CrMnN austenitic stainless steel annealed in a temperature ranging from 50 ℃ to 650 ℃ for 90 min and at 550 ℃ for different time were investig... The mechanical properties and microstructure evolution of cold-deformed CrMnN austenitic stainless steel annealed in a temperature ranging from 50 ℃ to 650 ℃ for 90 min and at 550 ℃ for different time were investigated by tensile test, micro hardness test, and Transmission Electron Microscope (TEM). The steel was strengthened when it got annealed at temperatures ranging from 100 ℃ to 550 ℃, while it was softened when it got annealed at temperatures ranging from 550 ℃ to 650 ℃. Annealing temperature had stronger effect on mechanical properties than annealing time. TEM observations showed that nano-sized precipitates formed when the steel was annealed at 150 ℃ for 90 min, but the size and density of precipitates had no noticeable change with annealing temperature and time. Recrystallization occurred when the steel was annealed at temperatures above 550 ℃ for 90 min, and its scale increased with annealing temperature. Nano-sized annealing twins were observed. The mechanisms that controlled the mechanical behaviors of the steel were discussed. 展开更多
关键词 annealing mechanical property microstructure twinning high nitrogen austenitic stainless steel
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Effect of the heat input on microstructure and properties of submerged arc welded joint of 08Cr19MnNi3Cu2N stainless steel 被引量:6
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作者 Dai Hong Xia Xiwei +2 位作者 Fang Naiwen Ma Qingjun Chang Jingshu 《China Welding》 EI CAS 2019年第3期48-53,共6页
SAW308L submerged arc welding wire and SJ601A submerged arc welding flux were selected to weld the 12 mm 08Cr19MnNi3Cu2N low nickel and high nitrogen austenitic stainless steel plates with three different welding heat... SAW308L submerged arc welding wire and SJ601A submerged arc welding flux were selected to weld the 12 mm 08Cr19MnNi3Cu2N low nickel and high nitrogen austenitic stainless steel plates with three different welding heat input,and microstructure,tensile properties,microhardness and corrosion properties of the welded joints were studied.The results show that no defects are found in the three groups of welded joints,and the welded joints have better performance.The tensile strength of 08Cr19MnNi3Cu2N stainless steel welded joints with different heat input is slightly lower than that of the base metal,and fracture occurs in the weld zone,and the hardness of the weld zone is lower than that of the base metal.The weld microstructure of stainless steel welded joints with different heat input is composed of austenite+δferrite,and ferrite is uniformly distributed in austenite.With the increase of the welding heat input,the ferrite content in the weld zone decrease gradually,the grain size in the thermal affected zone increase gradually,and the impact toughness reduce. 展开更多
关键词 heat input submerged arc welding low nickel and high nitrogen austenitic stainless steel microstructure property
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高氮不锈钢光丝同轴激光增材组织与性能研究
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作者 丁建祥 张伟 +2 位作者 程远 彭勇 王克鸿 《电焊机》 2024年第11期105-112,共8页
为研究光丝同轴激光增材技术在制备高氮不锈钢块体材料中的应用潜力,采用直径1.2 mm、氮含量为0.71 wt.%的高氮钢丝材,通过光丝同轴激光增材技术进行多道多层增材试验。利用工业CT扫描、氮含量分析、组织形貌观察、物相分析及力学性能... 为研究光丝同轴激光增材技术在制备高氮不锈钢块体材料中的应用潜力,采用直径1.2 mm、氮含量为0.71 wt.%的高氮钢丝材,通过光丝同轴激光增材技术进行多道多层增材试验。利用工业CT扫描、氮含量分析、组织形貌观察、物相分析及力学性能测试等方法,对增材块体的内部质量、氮含量、微观组织及力学性能进行了系统研究。结果表明,增材块体中存在少量未熔合缺陷,主要分布在底部,且一般出现于每一层的前两道附近,等效直径主要分布于200~300μm。内部存在大量细小孔洞状低密度缺陷,其体积占比为0.073%,其中约90%的等效直径区间为1.5~7.5μm。中部和顶部的氮含量都在0.66 wt.%以上,氮损失均低于7.5%;底部氮含量降至0.58 wt.%,氮损失为19%。物相分析表明,增材块体主要为奥氏体γ-Fe相,通过SEM和EDS可发现基体材料中存在少量α-Fe枝晶和Mn的氧化物。金相观察发现,增材块体主要由细小的柱状晶和等轴晶组成。增材块体底部力学性能较好,中部各向异性较小。其增材方向上的硬度分布为315~355 HV,且底部明显高于中部和顶部。块体中部增材方向抗拉强度875 MPa,屈服强度为679 MPa,延伸率为50%;行进方向抗拉强度为908 MPa,屈服强度为685 MPa,延伸率为34%。此外,块体底部行进方向的抗拉强度为997 MPa,屈服强度为770 MPa,延伸率为43%。本研究证实了光丝同轴激光增材技术制备高氮不锈钢块体材料的可行性,为高氮不锈钢增材制造技术的开发和应用提供了重要的理论依据和技术支持。 展开更多
关键词 高氮不锈钢 光丝同轴激光增材技术 缺陷检测 微观组织 力学性能
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