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Pre-bainitic Transformation in Fe-Ni Alloy

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Journal of Iron and Steel Research International 1998年第2期5卷 49-51页

作者： Shen Rong Cheng Juqiang kang mokuang Northwestern Polytechnical University

The behaviour of the pre bainitic transformation in Fe Ni alloy was investigated by using SAM, X ray diffraction and TEM. The results show that there is segregation of Ni atoms in austenite and that bainite forms i... 详细信息

关键词： bainite pre bainitic transformation Fe Ni alloy

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Nucleation of Bainite around Grain Boundary

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Journal of Materials Science & Technology 1998年第4期14卷 383-384页

作者： Shen, Rong Cheng, Juqiang Wang, Liuding kang, mokuang Northwestern Polytech Univ Dept Mat Sci & Engn Xian 710072 Peoples R China

The scanning Auger microprobe study on Fe-8Mn-1C alloy shows that the carbon atoms segregate at grain boundary during bainitic transformation and solute atoms depleted regions form near the grain boundary. The observation of optical and TEM indicates that bainite nucleates in solute atoms depleted regions near the grain boundary. (Edited author abstract) 11 Refs.

关键词： Iron alloys

FATIGUE PROPERTIES OF META-BAINITE IN STEEL 40CrMnSiMoVA

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Acta Metallurgica Sinica(English Letters) 1992年第3期5卷 206-211页

作者： CHEN Daming kang mokuang Northwestern Polytechnical University,Xi′an,ChinaTAN Ruobing Institute of Metal Research,Academia Sinica,Shenyang,China Northwestern Polytechnical Univ Xi'an China

The microstructure,strength,toughness and fatigue properties of an ultra-high strength steel 40CrMnSiMoVA have been *** so-called meta-bainite,composed of thin re- tained austenite films within or between the bainitic ferrite lathes was found in the steel after isothermally quenched at 300℃ for *** comparison with the martensite structure obtained by isothermally quenching in martensite range,the meta-bainite has more excellent strength and plasticity,lower notch sensitivity,stronger strain harden ability,higher fatigue strength, longer strain or impact fatigue life,slower crack propagation rate and more remarkable overload effect on increasing fatigue life.

关键词： ultra-high strength steel meta-bainite microstructure fatigue property

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淬火合金钢中的奥氏体稳定化

金属学报 2005年第7期41卷 673-679页

作者：康沫狂朱明西北工业大学材料学院西安710072

研究了马氏体(M)和贝氏体(B)两相温度区等温淬火组织中的奥氏体稳定化.在一定等温时间内,奥氏体稳定化程度,即残余奥氏体量与等温温度间的关系呈马鞍型曲线.在实验钢中,其谷底值低于用同冷却介质淬火组织中的AR,表明在一定条件下等温停... 详细信息

研究了马氏体(M)和贝氏体(B)两相温度区等温淬火组织中的奥氏体稳定化.在一定等温时间内,奥氏体稳定化程度,即残余奥氏体量与等温温度间的关系呈马鞍型曲线.在实验钢中,其谷底值低于用同冷却介质淬火组织中的AR,表明在一定条件下等温停留并不引起残余奥氏体量增多.可利用马鞍型曲线调整AR与M及B的含量配比,获得无变形或强韧性配合最佳的准贝氏体等温淬火工艺.奥氏体稳定化为热稳定化、化学稳定化、相致稳定化和宏观热应力稳定化诸机制的综合作用.马氏体临界点Mc点无特殊物理意义.

关键词：奥氏体稳定化热稳定化化学稳定化相致稳定化准贝氏体

Investigation of Transformation for Ultrahigh Strength Steel Aermet 100

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Journal of Materials Science & Technology 2000年第5期16卷 491-494页

作者： Liuding WANG+, Lin LIU, Chengxi AO, Xiaojun LIU, Changle CHEN and mokuang kang (Northwestern Polytechnical University, Xi’an 710072, China) Northwestern Polytechnical University Xi'an 710072 China

The heat-stagnation curves of two quenched and cryogenically treated ultrahigh strength AF1410 and Aermet 100 steels during heating and cooling in furnace have been measured. The results showed that the curve displayed an abnormal terrace in the course of heating, and within the temperature range corresponding to the terrace, the formation and growth of both cementite Fe3C and secondary hardening phase M2C in the steel make the carbon content in matrix ob- viously vary. It is in the region of terrace that the optimum combination of tensile strength and fracture toughness is obtained because of secondary hardening. Based on the measured heat-stagnation curve, several transformation points have been determined and the correctness was also verified by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Furthermore, the influence of heating rate and tempering temperature on the crystal structure and stability of austenite has been studied.

关键词： Steel

HIGH-TEMPERATURE TEM IN SITU STUDY OF GROWTH KINETICS OF BAINITE IN β BRASS

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Acta Metallurgica Sinica(English Letters) 1992年第5期5卷 309-313页

作者： YANG Yanqing LIU Donghui kang mokuang Northwestern Polytechnical University,Xi’an,ChinaSUN Yuan Beijing Centre of Physical and Chemical Analysis,Beijing,China Northwestern Polytechnical Univ Xi'an China

In situ observation of the growth process of bainitic plate in βbrass by means of high-temper- ature TEM is *** lengthening and thickening kinetics of bainitic plate is analysed with Trivedi's model and Zener-Hillert's model,*** is found that the stacking fault substructure exists just in the growth tip of fresh bainitie plate and so does the shear stress in the matrix around the *** measured lengthening rate of bainitic plate is not con- sistent with Trivedi's *** thiekening process is only macroscopieally controlled by vol- ume diffusion but its nature is a shear process.

关键词： β-brass bainite growth kinetics shear volume diffusion

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贝氏体相变理论研究工作的主要回顾

金属热处理学报 2000年第2期21卷 2-8页

作者：康沫狂西北工业大学材料科学与工程学院陕西西安710072

贝氏体分上贝氏体和下贝氏体。粒状贝氏体和准贝氏体为贝氏体转变的初级阶段 ;粒状组织不属于贝氏体。各类组织均有自己的C曲线。由C曲线组成中温TTT图 ,能形成几个海湾。贝氏体预相变期发生溶质原子偏聚 ,贫溶质区即形核位置。贝氏体... 详细信息

贝氏体分上贝氏体和下贝氏体。粒状贝氏体和准贝氏体为贝氏体转变的初级阶段 ;粒状组织不属于贝氏体。各类组织均有自己的C曲线。由C曲线组成中温TTT图 ,能形成几个海湾。贝氏体预相变期发生溶质原子偏聚 ,贫溶质区即形核位置。贝氏体在溶质原子扩散影响下相变基元沿缺陷面方向切变而增宽 (厚 ) ,板条端部区相变基元平行叠加而伸长。贝氏体在晶体学上有切变性质 ,在热力学上有切变可能。

关键词：粒状组织准贝氏体预贝氏体相变贝氏体相变

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准贝氏体铸钢磨粒磨损性能研究

机械工程材料 2000年第1期24卷 37-39页

作者：程巨强康沫狂西安工业学院材料科学与工程系陕西西安710032 西北工业大学材料科学与工程学院陕西西安710072

研究了铸造贝氏体钢的磨粒磨损性能。结果表明,该钢具有较高的耐磨性,经与高锰钢耐磨性对比试验。

关键词：贝氏体钢铸钢耐磨材料磨粒磨损性能

Thermodynamics of Bainitic Formation in Carbon-depleted Region in Fe-C Alloys

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Journal of Materials Science & Technology 1994年第6期10卷 441-444页

作者： Xiaolei WU Xiangkang MENG Xiyan ZHANG Yanqing YANG and mokuang kang(Dept. of Materials Science and Technology, 401, Northwestern Polytech. University, Xi’an, 710072, China) Northwestern Polytech. Univ Xi'an China

Thermodynamic analysis for the formation of bainitic ferrite in carbon -depleted region has been conducted. The results show that the driving force of bainitic formation increases with depleting of carbon in parent austenite and with decreasing the transformation temperature. The critical driving force (absolute value) at the Bs temperature is 600-1 200 J / mol, which increases as the mean carbon content of Fe-C alloys increases. The freshly-formed bainitic ferrite has partial supersaturation of carbon, which increases smoothly with decreasing the transformation temperature Therefore, the displacive formation of bainitic ferrite in carbon-depleted region is thermodynamically feasible in the whole temperature range of bainitic reaction.

关键词： Fe AIME