期刊文献+
共找到49篇文章
< 1 2 3 >
每页显示 20 50 100
EFFECT OF COPPER AND BORON CONTENT ON STRAIN-INDUCED Nb(C,N) PRECIPITATION IN ULCB STEELS AT HOT DEFORMATION TEMPERATURE 被引量:16
1
作者 G.F. Zhou, M. B. Wen, P. H. Li and X. L. He 1) National Enterprise Technology Center, Wuhan Iron & Steel Group Co., Wuhan 430080, China 2) University of Science and Technology Beijing, Beijing 100083, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第2期623-628,共6页
The stress relaxation curves of Ultra-Low Carbon Bainitic(ULCB) steels with different Cu and B contents were measured by using Gleeble-1500 dynamic thermal-mechanical simulator. The results show that Cu and B added ca... The stress relaxation curves of Ultra-Low Carbon Bainitic(ULCB) steels with different Cu and B contents were measured by using Gleeble-1500 dynamic thermal-mechanical simulator. The results show that Cu and B added can accelerate the strain-induced precipitation reaction, and the effect of Cu and B is even more obvious with Cu and B combined addition or Cu content increased. The TEM analysis of precipitate engendered at the temperature of 850℃ C indicate that Nb(C,N) precipitate nucleates dominantly on the dislocation line, and grows with holding time extended while the precipitate particle size increases from 5 nm to 17 nm. 展开更多
关键词 stress relaxation strain-induced precipitation ULCB steels
下载PDF
MODELING OF STRAIN-INDUCED PRECIPITATION KINETICS IN Nb MICROALLOYED STEELS 被引量:2
2
作者 X. G. Zhou Z. Y. Liu +2 位作者 D. Wu Z. Li C.M. Li 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2006年第5期385-390,共6页
On the basis of the thermodynamic calculation of precipitation and considering the effect of strain on the precipitation behavior and chemical composition (Si and Mn), the kinetics of precipitation from austenite ha... On the basis of the thermodynamic calculation of precipitation and considering the effect of strain on the precipitation behavior and chemical composition (Si and Mn), the kinetics of precipitation from austenite has been investigated for different temperatures and strains. Nucleation theory and the solubility product of niobium, carbon, and nitrogen in austenite have been used to derive equations for the start time of precipitation as a function of temperature and composition. The value of n in Avrami equation was determined using the available experimental data from the published reports, which indicated that n is a constant independent of temperature and the end time of precipitation is a function of n and the start time of precipitation. The values of the start time and end time of precipitation predicted by the new model are compared with the experimental values and a good agreement was obtained between both. 展开更多
关键词 strain-induced precipitation start time of precipitation end time ofprecipitation precipitation kinetics
下载PDF
Effects of strain-induced melt activation treatment on the microstructure and properties of Zn sacrificial anodes 被引量:1
3
作者 Behrooz Shayegh Boroujeny Payam Raiesi Goojani Ehsan Akbari 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第10期1693-1704,共12页
The microstructural properties and electrochemical performance of zinc(Zn)sacrificial anodes during strain-induced melt activation(SIMA)were investigated in this study.The samples were subjected to a compressive ratio... The microstructural properties and electrochemical performance of zinc(Zn)sacrificial anodes during strain-induced melt activation(SIMA)were investigated in this study.The samples were subjected to a compressive ratio of 20%-50% at various temperatures(425-435℃)and durations(5-30 min).Short-term electrochemical tests(anode tests)based on DNV-RP-B401 and potentiodynamic polarization tests were performed in 3.5wt%NaCl solution to evaluate the electrochemical efficiency and corrosion behavior of the samples,respectively.The electrochemical test results for the optimum sample confirmed that the corrosion current density declined by 90% and the anode efficiency slightly decreased relative to that of the raw sample.Energy-dispersive X-ray spectroscopy,scanning electron microscopy,metallographic images,and microhardness profiles showed the accumulation of alloying elements on the boundary and the conversion of uniform corrosion into localized corrosion,hence the decrease of the Zn sacrificial anode’s efficiency after the SIMA process. 展开更多
关键词 strain-induced melt activation process zinc sacrificial anode corrosion resistance anode test
下载PDF
Energy Spectrum, g Factors, Strain-Induced Level-Splittings and R-Line Thermal Shift of MgO:V^(2+)
4
作者 ZHANG Zheng-Jie MA Dong-Ping 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第8期511-516,共6页
Traditional ligand-field theory has to be improved by taking into account both pure electronic contribution and electron-phonon interaction one (including lattice-vibrational relaxation energy). By means of improved... Traditional ligand-field theory has to be improved by taking into account both pure electronic contribution and electron-phonon interaction one (including lattice-vibrational relaxation energy). By means of improved ligand-field theory, the R line, t^322T1 and t^322T2 lines, t^22(^3T1)e^4T2, t^22(^3T1)e^4T1 and t2e^2(^4A2)4T1 bands, g factors of t^32 ^4A2 and t32E, four strain-induced level-splittings and R-line thermal shift of MgO:V^2+ have been calculated. The results are in very good agreement with the experimental data. It is found that for MgO:V^2+, the contributions due to electronphonon interaction (EPI) come from the first-order term; the contributions from the second-order and higher terms are insignificant. In thermal shift of R line of MgO:V^2+, the temperature-dependent contribution due to EPI is dominant. The results obtained in this work may be used in theoretical calculations of other effects of EPI. 展开更多
关键词 improved ligand-field theory electron-phonon interaction energy spectrum strain-induced split-ting thermal shift g factor
下载PDF
Characteristics of Strain-Induced Ferrite in Low Carbon Steel
5
作者 LIWei-juan LIUCui-qin +1 位作者 WANGGuo-dong LIUXiang-hua 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2003年第4期54-58,共5页
The strain-induced ferrite formed under different conditions was observed with SEM and optical microscope.The nucleation sites of strain-induced ferrite include grain boundary,grain inside,deformed band and annealing ... The strain-induced ferrite formed under different conditions was observed with SEM and optical microscope.The nucleation sites of strain-induced ferrite include grain boundary,grain inside,deformed band and annealing twin boundary.The shapes of the ferrite accordingly are equiaxed irregular polygonal,strip-shaped and acicular. 展开更多
关键词 low carbon steel strain-induced ferrite grain boundary formed band annealing twin boundary
下载PDF
Influence of Carbides and Strain-induced Martensite on Wear Resistance of Austenitic Medium Manganese Steels
6
作者 姜启川 何镇明 陈炎平 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1989年第4期268-272,共5页
The abrasive wear behaviour of austenitic medium manganese steels was studied under weak corrosion-abrasive wear simulating the liner plate in wet metallic ore bail mill under non-severe impact-loading working conditi... The abrasive wear behaviour of austenitic medium manganese steels was studied under weak corrosion-abrasive wear simulating the liner plate in wet metallic ore bail mill under non-severe impact-loading working condition. Results show that the work-hardening mechanism and the wear resistance of high carbon austenitic medium manganese steels differ from those of medium carbon austenitic medium manganese steel. Under non-severe impact and weak corrosion-abrasive wear,the wear resistances of high carbon and medium carbon austenitic medium manganese steels are 50-90% and 20-40% higher than that of Hadfield steel respectively. 展开更多
关键词 carbides strain-induced martensite wear resistance manganese steel
下载PDF
KINETICS OF STRAIN-INDUCED PRECIPITATION OF (Nb,V) CARBONITRIDE IN A MICROALLOYED STEEL
7
作者 XU Wenchong SUN Fuyu ZHAO Peixiang Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,Beijing,China XU Wenchong Senior Engineer,Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,Beijing,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1989年第2期113-118,共6页
The kinetics of the isothermal precipitation of(Nb,V)CN in Nb-V alloys has been investi- gated by using the Formastor-press simulator and the extraction replica method.Under four deformation amounts(0,10,30,50%)and th... The kinetics of the isothermal precipitation of(Nb,V)CN in Nb-V alloys has been investi- gated by using the Formastor-press simulator and the extraction replica method.Under four deformation amounts(0,10,30,50%)and three temperatures(1100,1000,850℃), four types of kinetic curves were found. 展开更多
关键词 Nb-V microalloy kinetics isothermal strain-induced precipitation particle size
下载PDF
Strain-induced insulator–metal transition in ferroelectric BaTiO_3(001) surface:First-principles study
8
作者 杨林 王长安 +5 位作者 刘聪 秦明辉 陆旭兵 高兴森 曾敏 刘俊明 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第7期378-381,共4页
The electronic properties of TiO2-terminated BaTiO3(001) surface subjected to biaxial strain have been studied using first-principles calculations based on density functional theory. The Ti ions are always inward s... The electronic properties of TiO2-terminated BaTiO3(001) surface subjected to biaxial strain have been studied using first-principles calculations based on density functional theory. The Ti ions are always inward shifted either at compressive or tension strains, while the inward shift of the Ba ions occurs only for high compressive strain, implying an enhanced electric dipole moment in the case of high compressive strain. In particular, an insulator–metal transition is predicted at a compressive biaxial strain of 0.0475. These changes present a very interesting possibility for engineering the electronic properties of ferroelectric BaTiO3(001) surface. 展开更多
关键词 first-principles ferroelectricity insulator–metal transition strain-induced effect
原文传递
Modeling of strain-inducedγ→α′phase transformation for 201Cu metastable austenitic stainless steel and its verification in rolling processes
9
作者 Li-xia Xu Long-hui Zhou +2 位作者 Hong-yun Bi E Chang Feng-li Sui 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第9期2248-2254,共7页
To model the strain-inducedγ→α′phase transformation for the Cr-Mn metastable austenitic stainless steel,the 201Cu steel was chosen as the analytical material and the cylindrical samples of this steel with size ofϕ... To model the strain-inducedγ→α′phase transformation for the Cr-Mn metastable austenitic stainless steel,the 201Cu steel was chosen as the analytical material and the cylindrical samples of this steel with size ofϕ5 mm×10 mm were compressed at strains of 0.2–0.6 in the temperature range of 25–150°C and in the strain rate range of 0.1–5.0 s^(−1).The flaky samples were prepared by wire cutting from the cylindrical samples and the volume fraction of the strain-inducedα′phase was detected in the test point of the flaky samples.The volume fraction changing with the process parameters was modeled,and the critical temperatures and the critical strains to preventγ→α′phase transformation were calculated as other different process parameters changed.The linear fitting goodness of the model between the calculated volume fraction values and the tested ones is 0.986 and the validity of the model was verified by application in cold and warm rolling experiments. 展开更多
关键词 Modeling Volume fraction strain-inducedα′phase 201Cu steel Cylindrical compression experiment
原文传递
Modeling of Strain-Induced Precipitation Kinetics and Evolution of Austenite Grains in Nb Microalloyed Steels 被引量:8
10
作者 ZHOU Xiao-guang LIU Zhen-yu YUAN Xiang-qian WU Di WANG Guo-dong LIU Xiang-hua 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2008年第3期65-69,共5页
Considering the effect of strain and chemical composition onprecipitation behavior, new models for the start and end time of Nb(C,N) precipitation in austenite under the conditions of different temperatures and stra... Considering the effect of strain and chemical composition onprecipitation behavior, new models for the start and end time of Nb(C,N) precipitation in austenite under the conditions of different temperatures and strains have been investigated for Nb microalloyed steel. The value of n in the precipitation kinetic equation has been determined by using the available experimental data in literature, which indicated that n is a constant and independent of temperature. The values of the start and end time of the predicted precipitation are compared with the experimental values. Calculated results are in good agreement with the experimental results. Also, the evolution of austenite grains before ferrite transformation is simulated by taking the effect of precipitation into consideration. The measured austenite grain size is in good agreement with predicted one prior to ferrite transformation. 展开更多
关键词 strain-induced precipitation start time PRECIPITATION static recrystallization grain size
原文传递
Study on Phase Transformation Behavior of Strain-induced PLLA Mesophase by Polarized Infrared Spectroscopy 被引量:4
11
作者 Jian Hu Li-Li Han +2 位作者 Tong-Ping Zhang Yong-Xin Duan Jian-Ming Zhang 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2019年第3期253-257,共5页
The structural transformation of mesophase to crystalline phase of strain-induced poly(L-lactic acid) has been investigated by differential scanning calorimetry(DSC) and in situ temperature dependent polarized Fourier... The structural transformation of mesophase to crystalline phase of strain-induced poly(L-lactic acid) has been investigated by differential scanning calorimetry(DSC) and in situ temperature dependent polarized Fourier transform infrared(FTIR) spectroscopy. It is found that, as the drawing temperature increases, melting of strain-induced mesophase in the heating process can remarkably interfere the crystallization behavior subsequently. Coupling with in situ polarized FTIR, from 60 °C to 76 °C, the mesophase melts partially rather than completely melting, and changes immediately to three-dimensional ordered structure. Of particular note, through monitoring the subtle spectral change in the critical phase transformation temperature from 60 °C to 64 °C, it is clearly demonstrated that relaxation of oriented amorphous chains initially takes place prior to the melting of mesophase. 展开更多
关键词 Structural TRANSFORMATION MESOPHASE strain-induced POLARIZED IR SPECTROSCOPY
原文传递
Inhomogeneous Natural Network Promoting Strain-induced Crystallization:A Mesoscale Model of Natural Rubber 被引量:3
12
作者 Han Liu Guang-Su Huang +4 位作者 Lai-Yun Wei Jian Zeng Xuan Fu Cheng Huang Jin-Rong Wu 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2019年第11期1142-1151,共10页
Although synthetic rubbers show continuously improved mechanical properties,natural rubber (NR) remains irreplaceable in the rubber family due to its superior mechanical properties.A mainstream viewpoint regarding the... Although synthetic rubbers show continuously improved mechanical properties,natural rubber (NR) remains irreplaceable in the rubber family due to its superior mechanical properties.A mainstream viewpoint regarding the superiority of NR is that NR possesses a natural network formed by linking the poly(cis-l,4-isoprene) chain terminals to protein and phospholipid aggregates;after vulcanization,the natural network additionally contributes to rubber mechanics by both increasing the network density and promoting the strain-induced crystallization (SIC) behavior.However,the reason why the natural network promotes SIC is still unclear;in particular,only using the increased network density cannot explain our finding that the NR shows smaller onset strain of SIC than Gel (the gel component of NR with higher network density) and even vulcanized NR.Herein,we point out that the inhomogeneous chain deformation is the alternative reason why SIC of NR takes place at smaller strain than that of Gel.More specifically,although the natural network is homogenous on the subchain length scale based on the proton double-quantum NMR results,it is essentially inhomogeneous on mesoscale (100 nm),as revealed by the small angle X-ray scattering analysis.This inhomogeneous network also leads to the mesoscale deformation inhomogeneity,as detected by the orientation of stearic acid (SA) probe,thus resulting in the smaller onset strain of SIC of NR.Based on the experimental results,a mesoscale model is proposed to qualitatively describe the crucial roles of inhomogeneous structure and deformation of natural network in NR?s mechanical properties,providing a clue from nature to guide the development of high-performance rubbers with controlled structures at mesoscale. 展开更多
关键词 NATURAL RUBBER INHOMOGENEOUS NATURAL network strain-induced CRYSTALLIZATION MESOSCALE model
原文传递
Strain-induced Precipitation in Ti Micro-alloyed Interstitial-free Steel 被引量:3
13
作者 Ya-jun HUI Yang YU +3 位作者 Lin WANG Chang WANG Wen-yuan LI Bin CHEN 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第4期385-392,共8页
Stress relaxation method was carried out on a Ti micro-alloyed interstitial-free (IF) steel at the temperature ranging from 800 to 1000℃. The results show that the softening kinetics curves of deformed austenite ca... Stress relaxation method was carried out on a Ti micro-alloyed interstitial-free (IF) steel at the temperature ranging from 800 to 1000℃. The results show that the softening kinetics curves of deformed austenite can be divided into three stages. At the first stage, the stress has a sharp drop due to the onset of recrystallization. At the second stage, a plateau appears on the relaxation curves indicating the start and finish of strain-induced precipitation. At the third stage, the stress curves begin to descend again because of coarsening of precipitates. Precipitation-time temperature (PTT) diagram exhibited a "C" shape, and the nose point of the PTT diagram is located at 900 ℃ and the start precipitation time of 10 s. The theoretical calculation shows that the strain-induced precipitates were confirmed as almost pure TiC particles. The TiC precipitates were heterogeneously distributed in either a chain-like or cell-like manner observed by transmission electron microscopy (TEM), which indicates the precipitates nucleated on dislocations or dislocation substructures. In addition, a thermodynamic analytical model was presented to describe the precipitation in Ti micro-alloyed IF steel, which shows a good agreement between the experimental observation and the predictions of the model. 展开更多
关键词 Ti micro-alloyed IF steel stress relaxation strain-induced precipitation analytical model
原文传递
A strain-induced birefringent double-clad fiber Bragg grating 被引量:2
14
作者 李丽君 孙磊 +5 位作者 范万德 王志 罗建花 付圣贵 袁树忠 董孝义 《Chinese Optics Letters》 SCIE EI CAS CSCD 2005年第7期383-385,共3页
A strain-induced birefringence double-clad (DC) fiber Bragg grating (FBG) is proposed and demonstrated. The grating is fabricated in the core of rectangular inner cladding double clad fiber by using phase mask method.... A strain-induced birefringence double-clad (DC) fiber Bragg grating (FBG) is proposed and demonstrated. The grating is fabricated in the core of rectangular inner cladding double clad fiber by using phase mask method. By applying lateral strain on the grating, the birefringence is induced. In order to detect the birefringent effect of the grating, we use it as the output mirror of a laser. When lateral strain is applied, the grating becomes birefringent. Therefore, one reflection peak of double-clad fiber Bragg grating becomes two peaks and the laser also lases in two wavelengths. The wavelength spacing of the laser can be tuned from 0 to 0.8 nm. The absolute wavelengths for the two polarizations can be tuned 1.2 and 2.0 nm, respectively. 展开更多
关键词 FBG In A strain-induced birefringent double-clad fiber Bragg grating
原文传递
Effect of strain-induced precipitation on microstructure and properties of titanium micro-alloyed steels 被引量:1
15
作者 Xiang-dong Huo Zhi-wei Lv +3 位作者 Chen Ao Lie-jun Li Ji-nian Xia Song-jun Chen 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2022年第6期983-993,共11页
The strain-induced precipitation behavior of titanium micro-alloyed steel was examined through the stress relaxation method.In addition,the relationship between strain-induced precipitation and isothermal precipitatio... The strain-induced precipitation behavior of titanium micro-alloyed steel was examined through the stress relaxation method.In addition,the relationship between strain-induced precipitation and isothermal precipitation was explored.The findings revealed that the strain-induced precipitation and recrystallization processes of titanium micro-alloyed steel coexist and compete at the same time.The results also showed that the recrystallization process was inhibited with straininduced precipitation.Moreover,a large amount of nano-sized TiC particles precipitated in Ti micro-alloyed steel.Notably,the strain-induced precipitated TiC had a size of 10 nm and isothermally precipitated TiC had a size of 3–6 nm.Additionally,there was a clear competitive relationship between strain-induced precipitation and isothermal precipitation.The findings also showed that strain-induced precipitation had an obvious effect on the refinement of austenite although the effect was not obvious on the increase in the yield strength.Furthermore,isothermal treatment was shown to be more advantageous than strain-induced precipitation.Finally,the major increase in the yield strength was mainly attributed to the precipitation strengthening of nano-sized TiC during isothermal precipitation. 展开更多
关键词 Ti micro-alloyed steel Stress RELAXATION Nanometer-carbide strain-induced PRECIPITATION ISOTHERMAL PRECIPITATION
原文传递
Characterizations of Dynamic Strain-induced Transformation in Low Carbon Steel 被引量:2
16
作者 Luhan Hao Mingyue Sun +1 位作者 Namin Xiao Dianzhong Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2012年第12期1095-1101,共7页
Dynamic strain-induced transformation of the low carbon steel Q(235) at 770℃ and 850℃ leads to fine ferrite grains. The microstructure characterization and mechanism of the fine ferrite grain were studied by scann... Dynamic strain-induced transformation of the low carbon steel Q(235) at 770℃ and 850℃ leads to fine ferrite grains. The microstructure characterization and mechanism of the fine ferrite grain were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron backscattered diffraction (EBSD) technique. The results show that strain-induced microstructure is the mixed microstructure of ferrite and pearlite, with cementite randomly distributed on ferrite grain boundaries and the grains interiors. EBSD images of grain boundaries demonstrate that high angle grain boundaries (HAGBs) are dominant in both of the deformation induced microstructures occurring below and above A(e3) , with only a few low angle grain boundaries (LAGBs) existing in the grain interiors. It implies that the dynamic strain-induced transformation (DSIT) happens above and below A(e3) temperature and has the same phase transition mechanisms. The refinement of ferrite is the cooperative effect of DSIT and continuous dynamic recrystallization (CDRX) of ferrite. Besides, DSIT is deemed as an incomplete carbon diffusion phase transition through the analysis of microstructure and the previous simulated results. The strengths of the Q(235) steel with refined ferrite and pearlite structure get doubled than the initial state without treated by DSIT and the residual stress in the refined structure is partly responsible for the ductility loss. 展开更多
关键词 Dynamic strain-induced transformation Grain refinement Grain boundary misorientation Low carbon steel
原文传递
Strain-induced Precipitation Behavior ofδPhase in Inconel 718 Alloy
17
作者 Xian-ping WEI Wen-jie ZHENG +3 位作者 Zhi-gang SONG Ting LEI Qi-long YONG Qing-cheng XIE 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2014年第3期375-381,共7页
To study the precipitation dynamics of 3 phase in Inconel 718 alloy, two-stage interrupted compression method was used in the region of cold deformation temperatures and the temperatures range from 875 to 975 ℃. The ... To study the precipitation dynamics of 3 phase in Inconel 718 alloy, two-stage interrupted compression method was used in the region of cold deformation temperatures and the temperatures range from 875 to 975 ℃. The precipitation-time-temperature (PTT) curve of 3 phase was obtained by analyzing the softening kinetics curves. For verifying the type of the precipitates and confirming the validity of the test, the transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM) and energy dispersion spectrum (EDS) were em- ployed. Experimental results indicated that the PTT curve for 3 precipitation exhibited a typical "C" shape and the nose points of start and finish precipitation were about 5 s at 920 ℃ and 2 815 s at 940 ℃, respectively. In addition, the nucleation of δ was heterogeneous. The nucleation sites varied with temperatures, including dislocation, grain boundary and stacking fault within γ″ phase. And 3 particles grew quickly at higher temperature with lower density. Moreover, the driving force of nucleation was mainly including chemical free energy, interracial energy and disloca- tion distorted energy. And the dislocation distorted energy could decide the density of nucleation in the strain-induced process. 展开更多
关键词 Inconel 718 alloy strain-induced precipitation cold deformation nucleation site
原文传递
Effect of Chromium-enhanced Diffusivity on Reverted Transformation in Metastable Austenitic Stainless Steels:Theoretical Calculation and Experiment
18
作者 WANG Tao YU Fu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第2期451-454,共4页
Effects of nucleation sites and diffusivity enhancement of chromium on reverted transformation of AISI 304 stainless steel during annealing process were investigated.Dynamics calculation revealed that the reverted tra... Effects of nucleation sites and diffusivity enhancement of chromium on reverted transformation of AISI 304 stainless steel during annealing process were investigated.Dynamics calculation revealed that the reverted transformation of strain-inducedα’-martensite→γaustenite could were closely associated with active nucleation sites and diffusivity enhancement of chromium in nanocrystallineα’-martensite.The experimental data and the results were in accordance with 2-grain austenite/α’-martensite junctions calculated theoretically,which could result from high chromium diffusion rate in nanocrystallineα’-martensite.In addition,low temperature is not conducive to reversed transformation,while high temperature and long annealing time will lead to inhomogeneous grain size distribution. 展开更多
关键词 austenitic stainless steel ANNEAL diffusion phase transformation strain-inducedα′-martensite
原文传递
Isomorphism Continuum Stored Energy Functional for Finite Thermoelastic Deformation
19
作者 Fuzhang Zhao 《Advances in Pure Mathematics》 2023年第2期133-151,共19页
Continuum mechanics for isotropic finite thermoelastic deformations have been reviewed. Thermal effects on mechanical responses of rubbers have been captured by the isomorphism continuum stored energy (CSE) functional... Continuum mechanics for isotropic finite thermoelastic deformations have been reviewed. Thermal effects on mechanical responses of rubbers have been captured by the isomorphism continuum stored energy (CSE) functional with the multiplicative decomposition of deformation gradient while preserving the structure of symmetry for finite structural deformation. The CSE finite thermoelastic model fits and predicts experimental data of SR and NR-C60 rubbers at different external temperatures. For internal temperature effects of both NR and NR-SIC rubbers, the CSE finite thermoelastic model of stored energy and entropy, along with the newly developed CTE and CI models, fits both nominal stress-stretch and temperature change-stretch experimental data in uniaxial extension tests. 展开更多
关键词 ENTROPY Finite Thermoelasticity Isomorphism Constitutive Model strain-induced Crystallization THERMODYNAMICS
下载PDF
Dynamic recrystallization behavior of 7085 aluminum alloy during hot deformation 被引量:12
20
作者 李东锋 张端正 +4 位作者 刘胜胆 单朝军 张新明 王琴 韩素琦 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第6期1491-1497,共7页
The dynamic recrystallization behavior of 7085 aluminum alloy during hot compression at various temperatures (573?723 K) and strain rates (0.01-10 s^-1) was studied by electron back scattered diffraction (EBSD... The dynamic recrystallization behavior of 7085 aluminum alloy during hot compression at various temperatures (573?723 K) and strain rates (0.01-10 s^-1) was studied by electron back scattered diffraction (EBSD), electro-probe microanalyzer (EPMA) and transmission electron microscopy (TEM). It is shown that dynamic recovery is the dominant softening mechanism at high Zener?Hollomon (Z) values, and dynamic recrystallization tends to appear at low Z values. Hot compression with ln Z=24.01 (723 K, 0.01 s?1) gives rise to the highest fraction of recrystallization of 10.2%. EBSD results show that the recrystallized grains are present near the original grain boundaries and exhibit similar orientation to the deformed grain. Strain-induced boundary migration is likely the mechanism for dynamic recrystallization. The low density of Al3Zr dispersoids near grain boundaries can make contribution to strain-induced boundary migration. 展开更多
关键词 aluminum alloy Zener-Hollomon parameter dynamic recrystallization strain-induced boundary migration Al3Zr dispersoids
下载PDF
上一页 1 2 3 下一页 到第
使用帮助 返回顶部