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Controlled Rolling and Cooling Process for Low Carbon Cold Forging Steel 被引量:4
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作者 李壮 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第1期89-93,共5页
Effect of controlled rolling and cooling process on the mechanical properties of low carbon cold forging steel was investigated for different processing parameters of a laboratory hot rolling mill. The results show th... Effect of controlled rolling and cooling process on the mechanical properties of low carbon cold forging steel was investigated for different processing parameters of a laboratory hot rolling mill. The results show that the specimens with fast cooling after hot rolling exhibit very good mechanical properties, and the improvement of the mechanical properties can be attributed mainly to the ferrite-grain refinement. The mechanical properties increase with decreasing final cooling temperature within the range from 670 ℃ to 570 ℃ due to the finer interlamellar spacing of pearlite colony. The specimen with fast cooling after low temperature rolling shows the highest values of the mechanical properties. The effect of the ferrite grain size on the mechanical properties was greater than that of pearlite morphology in the present study. The mechanical properties of specimens by controlled rolling and cooling process without thermal treatment were greatly superior to that of the same specimens by the conventional rolling, and their tensile strength reached 490 MPa grade even in the case of low temperature rolling without controlled rolling. It might be expected to realize the substitution medium-carbon by low-carbon for 490 MPa grade cold forging steel with controlled rolling and cooling process. 展开更多
关键词 controlled rolling and cooling process low carbon cold forging steel fast cooling low temperature rolling the ferrite-grain refineme
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MODELING OF MICROSTRUCTURAL EVOLUTION IN MICROALLOYED STEEL DURING HOT FORGING PROCESS 被引量:15
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作者 J. Wang J. Chen Z. Zhao X.Y. Ruan 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2006年第4期279-286,共8页
The microstractural evolution of microalloyed steel during hot forging process was investigated using physical simulation experiments. The dynamic recrystallized fraction was described by modifying Avrami's equation,... The microstractural evolution of microalloyed steel during hot forging process was investigated using physical simulation experiments. The dynamic recrystallized fraction was described by modifying Avrami's equation, the parameters of which were determined by single hit compression tests. Double hit compression tests were performed to model the equation describing the static recrystallized fraction, and the obtained predicted values were in good agreement with the measured values. Austenitic grain growth was modeled as: Dinc^5 = D0^5 + 1.6 × 10^32t·exp ( -716870/RT ) using isothermal tests. Furthermore, an equation describing the dynamic recrystallized grain size was given as Ddyn=3771·Z^-0.2. The models of microstructural evolution could be applied to the numerical simulation of hot forging. 展开更多
关键词 microalloyed forging steel flow stress recrystallized fraction grain size
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Detection and analysis of magnetic particle testing defects on heavy truck crankshaft manufactured by microalloyed medium-carbon forging steel 被引量:1
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作者 Jin-long Lu Guo-guang Cheng +2 位作者 Meng Wu Guo Yang Ju-long Che 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2020年第5期608-616,共9页
An unqualifed six-cylinder heavy truck crankshaft has been studied to investigate the cause of magnetic particle testing defects on the rod journals.Large-sized long-striped MnS inclusions are regarded as the major ca... An unqualifed six-cylinder heavy truck crankshaft has been studied to investigate the cause of magnetic particle testing defects on the rod journals.Large-sized long-striped MnS inclusions are regarded as the major cause for the magnetic particle testing failure because they have been detected in situ under the magnetic particle indications.Through the observation of macroscopic structures of the rod journals and corresponding counterweight blocks,it is found that for the 1#and 3#rod journals,the center metal of the original hot-rolled bar has been extruded to the inboard edge of the rod journals and large-sized long-striped MnS inclusions are exposed on the surface after fash removal,leading to the failure of magnetic particle testing.As for the 2#rod journal,the center metal of the original bar has not been extruded to the surface and MnS inclusions on the rod journal surface are small in size,few in number,resulting in passing the magnetic particle testing.If the quality of the hot-rolled bars fuctuates,it is more recommended to apply magnetic particle testing on samples at the center of bars before forging to evaluate the severity of defects caused by the long-striped MnS inclusions for fear of the scrap of the fnal crankshafts. 展开更多
关键词 CRANKSHAFT Magnetic particle testing MnS inclusion Microalloyed medium-carbon forging steel DEFECT
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Influence of Controlled Rolling and Cooling Process on the Mechanical Properties of Low Carbon Cold Forging Steel 被引量:1
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作者 LI Zhuang 1,WU Di 2,ZHENG Hui 1,DONG Xue-xin 2 (1.School of Materials Science and Engineering,Shenyang University of Aeronautics and Astronautics,Shenyang 110136,Liaoning,China 2.State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110004,Liaoning,China) 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第S1期595-599,共5页
In the present paper,controlled rolling and cooling processing was conducted by using a laboratory hot rolling mill.The influence of different processing parameters on the mechanical properties of low carbon cold forg... In the present paper,controlled rolling and cooling processing was conducted by using a laboratory hot rolling mill.The influence of different processing parameters on the mechanical properties of low carbon cold forging steel was investigated.The results show that the faster cooling after the deformation (especially in low temperature rolling conditions) leads to the refinement of the ferrite grain.The specimen exhibits very good mechanical properties owing to the finer ferrite grains.The pearlite morphologies can also affect the mechanical properties of low carbon cold forging steel.The mechanical properties increase with decreasing final cooling temperature within the range from 650℃ to 570 ℃ due to the finer interlamellar spacing of pearlite colony.The mechanical properties of the specimens with fast cooling after the conventional rolling are not only better than those of the specimens with slow cooling after low temperature rolling,but also almost similar to those of the specimens with fast cooling after low temperature rolling.It is suggested that fast cooling after high temperature rolling (the conventional rolling) process would be of important industrial value. 展开更多
关键词 controlled rolling and cooling process low carbon cold forging steel fast cooling the finer ferrite grains mechanical properties
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New Type Austenite Dynamic Recrystallization of Microalloyed Forging Steels 38MnVS During Forging Process
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作者 ZHANG Tong-bo SHEN Yong +2 位作者 LIU Pan YONG Qi-long BAO Yao-zong 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2013年第5期57-60,共4页
Hot compression tests of microalloyed forging steels 38MnVS were carried out on the Gleeble-3800 thermo-mechanical simulator at the deformation temperatures from 950 to 1 150 ℃ with the strain rates ranging from 0.1 ... Hot compression tests of microalloyed forging steels 38MnVS were carried out on the Gleeble-3800 thermo-mechanical simulator at the deformation temperatures from 950 to 1 150 ℃ with the strain rates ranging from 0.1 to 10 s^(-1). The effects of the deformation temperature and strain rate on the austenite dynamic recrystallization and microstructural changes were researched. The experimental results show that the dynamic recrystallization accelerated with the increase of the deformation temperatures and the decrease of the strain rate. The activation energy of dynamic recrystallization was calculated, which was about 275.453 kJ/mol. The relation between the dynamic recrystallization and the Z-parameter was investigated, and the state chart of the dynamic recrystallization of the microalloyed forging steel 38MnVS was made according to the experimental data and the deformation parameters. 展开更多
关键词 microalloyed forging steel activation energy dynamic recrystallization austenite grain size state chart 38MnVS
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Constitutive Model for F45V Microalloyed Forging Steel at High Temperature
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作者 Jin WANG Wen-long MA +1 位作者 Zhong CHU Qi ZHANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2014年第4期464-468,共5页
Isothermal hot compression experiments of F45V, a microalloyed steel, were performed on a Gleeble-1500 thermo-mechanical simulator at temperatures of 950--1200 ;C and strain rate of 0.01--10 s -1. Based on the experi-... Isothermal hot compression experiments of F45V, a microalloyed steel, were performed on a Gleeble-1500 thermo-mechanical simulator at temperatures of 950--1200 ;C and strain rate of 0.01--10 s -1. Based on the experi- mental flow stress curves, a constitutive model that was expressed by the hyperbolic laws in an Arrhenius-type equa- tion was established, and the material parameters of the model were expressed as 6th order polynomial form of strain. Standard statistical parameters such as correlation coefficient and average absolute relative error were em- ployed to quantify the predictability of the model. They were found to be 0. 995 and 4.34% respectively. The results show that the established constitutive mode[ can predict the magnitude and tendency of flow stress with the increase of deformation accurately, and can be used for the numerical simulation of hot forging process of the F45V steel. 展开更多
关键词 F45V steel microalloyed forging steel flow stress Arrhenius equation constitutive model
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Fatigue Behavior of Cemented Carbide Die in Cold Forging of Steel 被引量:2
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作者 Z.Wang and K.Dohda Dept. of Mechanical System Engineering, Gifu University, Gifu, Japan 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第1期51-52,共2页
The fatigue behavior of cemented carbide die under service load in the multistage cold forging of steel was investigated. It was found that the fatigue cracks do not initiate at the stress concentration position and t... The fatigue behavior of cemented carbide die under service load in the multistage cold forging of steel was investigated. It was found that the fatigue cracks do not initiate at the stress concentration position and the crack initiation position can be classified to three types. The crack initiation position can be predicted by FEM only when the plastic deformation of the die is considered. 展开更多
关键词 Fatigue Behavior of Cemented Carbide Die in Cold forging of steel
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Effects of Lanthanum on Mechanical Properties of 5CrNiMo Forging Die Steel
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作者 郝新 郭洪飞 +2 位作者 高文海 刘景顺 何智慧 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第S2期254-257,共4页
The alteration of the strength, hardness and impact ductility of 5CrNiMo steel using three different additions of RE La element is studied in this paper. The mechanical properties of 5CrNiMo steel with RE La additions... The alteration of the strength, hardness and impact ductility of 5CrNiMo steel using three different additions of RE La element is studied in this paper. The mechanical properties of 5CrNiMo steel with RE La additions are be compared with that of the 5CrNiMo steel on the same heat-treatment condition without RE La element addition. The results show that the strength, hardness and impact ductility of 5CrNiMo steel will be improved obviously when the content of RE La element is proper, and as the content of RE La element is 0.033%(mass fraction), the 5CrNiMo steel has the best mechanical properties. 展开更多
关键词 forging die steel 5CrNiMo strength HARDNESS impact ductility rare earths
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NUMBER 3 RARE EARTH FACTORY OF BAOTOU IRON—STEEL AND RARE EARTH CORPORATION,FORGING AHEAD IN THE MARCH OF REFORM
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《Journal of Rare Earths》 SCIE EI CAS CSCD 1990年第4期309-311,共3页
The Baotou iron-Steel and Rare Earth Co. is located in Baotou of the AutonomousRegion of Inner Mongolia, where China has her largest mineral reserves of rare earths, par-ticularly that at Baiyunebo. The rare earth res... The Baotou iron-Steel and Rare Earth Co. is located in Baotou of the AutonomousRegion of Inner Mongolia, where China has her largest mineral reserves of rare earths, par-ticularly that at Baiyunebo. The rare earth reserves in this region amount to as high as 80%of that of the whole Nation. The No. 3 Rare Earth Factory was established in 196l and itwas then a pilot plant of the Baotou Steel Works. In 1970 it was reconstructed as a formalplant. Now, it becomes one of the biggest rare earth production bases in China. 展开更多
关键词 Eu NUMBER 3 RARE EARTH FACTORY OF BAOTOU IRON steel AND RARE EARTH CORPORATION forging AHEAD IN THE MARCH OF REFORM RE
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Hot deformation behavior and flow stress model of F40MnV steel 被引量:2
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作者 王进 陈军 +1 位作者 赵震 阮雪榆 《Journal of Central South University of Technology》 EI 2007年第1期19-23,共5页
Single hit compression tests were performed at 1 223-1 473 K and strain rate of 0.1-10 s-1 to study hot deformation behavior and flow stress model of F40MnV steel. The dependence of the peak stress, initial stress, sa... Single hit compression tests were performed at 1 223-1 473 K and strain rate of 0.1-10 s-1 to study hot deformation behavior and flow stress model of F40MnV steel. The dependence of the peak stress, initial stress, saturation stress, steady state stress and peak stain on Zener-Hollomon parameter were obtained. The mathematical models of dynamic recrystallization fraction and grain size were also obtained. Based on the tested data, the flow stress model of F40MnV steel was established in dynamic recovery region and dynamic recrystallization region, respectively. The results show that the activation energy for dynamic recrystallization is 278.6 kJ/mol by regression analysis. The flow stress model of F40MnV steel is proved to approximate the tested data and suitable for numerical simulation of hot forging. 展开更多
关键词 microalloyed forging steel flow stress dynamic recovery dynamic recrystallization Zener-Hollomon parameter
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Rolling-contact-fatigue behavior in backup roll of 5% Cr forged steel
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作者 WEN Hongquan QIN Xiaofeng WU Qiong 《Baosteel Technical Research》 CAS 2018年第1期41-46,共6页
With a focus on the backup roll, a rolling-contact-fatigue experiment was performed on samples of 5% Cr forged steel. The P-S-N fatigue curves were determined and the fatigue strength was calculated. The emergence of ... With a focus on the backup roll, a rolling-contact-fatigue experiment was performed on samples of 5% Cr forged steel. The P-S-N fatigue curves were determined and the fatigue strength was calculated. The emergence of cracks on the test-sample surfaces was observed at different fatigue cycles. A micro-hardness tester was used to measure the hardness of the subsurface fatigue layer. The microstructures were analyzed at various magnifications with an optical microscope, scanning electron microscope, and transmission electron microscope. Based on these tests, the rolling-contact-fatigue mechanism of the large forged steel backup roll was also considered. The results showed that the contact-fatigue strength of the tested backup roll steel was 1 249 MPa;the surface fatigue crack lengthened continuously as the number of cycles increased and followed an S-shaped curve; the subsurface fatigue hardness reached its highest value at about 90 (HV) increment from the matrix hardness of 540 (HV) in the backup roll; the subsurface martensite/bainite microstructure was crushed and the dislocation density was greatly increased. Under alternating contact stresses,the surface/subsurface material was damaged and exhibited many microdefects. At the least, the surface fatigue layer on backup rolls should be fully removed before the microcracks enter a period of rapid propagation. 展开更多
关键词 contact fatigue fatigue property crack propagation microstmcture failure mechanism 5% Cr forged steel backup roll
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Mechanical properties of a microalloyed bainitic steel after hot forging and tempering 被引量:7
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作者 Zhi-bao Xu Wei-jun Hui +3 位作者 Zhan-hua Wang Yong-jian Zhang Xiao-li Zhao Xiu-ming Zhao 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第11期1085-1094,共10页
Mechanical properties of a newly developed microalloyed bainitic steel were investigated after the hot forging, air cooling and tempering process. The microstructure of the as forged bainitic steel mainly consists of ... Mechanical properties of a newly developed microalloyed bainitic steel were investigated after the hot forging, air cooling and tempering process. The microstructure of the as forged bainitic steel mainly consists of granular bainite and -20 vol. % martensite. The fraction of retained austenite remains unchanged until tempering at 200 ℃, above which it decreases significantly. The increase of tempering temperature leads to decreases of both ultimate tensile strength and total elongation but decreases of both yield strength and reduction of area. The maximum and mini- mum values of impact toughness were observed after tempering at around 200 and 400 ℃, respectively. These effects are mainly attributed to the decomposition of martensite/austenite con stituents and the tempering effects in martensite. The tempering of the forged bainitic steel at around 200 ℃ results in an excellent combination of strength and toughness, which is comparable to that of the conventional quenched and-tempered 40Cr steel. Therefore, low-tempering treatment coupled with post-forging residual stress relieving is a feasible method to further improve the mechanical prooerties of the bainitic foging steel. 展开更多
关键词 Bainitic forging steel Mechanical property Tempering Microstructure Granular bainite
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Leading manufacture of the large-scale weldless stainless steel forging ring:Innovative approach by the multilayer hot-compression bonding technology 被引量:3
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作者 Mingyue Sun Bin Xu +2 位作者 Bijun Xie Dianzhong Li Yiyi Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第12期84-86,共3页
Here,we report the leading manu facture of the large-scale integral weldless stainless steel forging ring(φ=15.6 m)by the multilayer additive hot-compression bonding technology.Moreover,the detailed interface healing... Here,we report the leading manu facture of the large-scale integral weldless stainless steel forging ring(φ=15.6 m)by the multilayer additive hot-compression bonding technology.Moreover,the detailed interface healing mecha nism involving interfacial oxide evolution is elucidated,which validates the feasibility and reliability of the technique we proposed. 展开更多
关键词 The largest stainless steel forging ring Interface bonding Interfacial oxides Multilayer additive hot-compression bonding
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Dynamic Recrystallization Behavior of Microalloyed Forged Steel 被引量:7
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作者 WANG Jin CHEN Jun ZHAO Zhen RUAN Xue-yu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2008年第3期78-81,91,共5页
The dynamic recrystallization behavior of microalloyed forged steel was investigated with a compression test in the temperature range of 1 223-1 473 K and a strain rate of 0. 01-5 s^-1. Activation energy was calculate... The dynamic recrystallization behavior of microalloyed forged steel was investigated with a compression test in the temperature range of 1 223-1 473 K and a strain rate of 0. 01-5 s^-1. Activation energy was calculated to be 305.9 kJ/mol by regression analysis. Modeling equations were developed to represent the dynamic recrystallization volume fraction and grain size. Parameters of the modeling equations were determined as a function of the Zener-Hollomon parameter. The developed modeling equation will be combined with finite element modeling to predict microstructural change during the hot forging processing. 展开更多
关键词 microalloyed forged steel dynamic recrystallization flow stress
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