304奥氏体不锈钢超低温轧制变形诱发马氏体转变的定量分析及组织表征

发布时间：2017-12-28 19:27

本文关键词：304奥氏体不锈钢超低温轧制变形诱发马氏体转变的定量分析及组织表征　出处：《金属学报》2016年08期 　论文类型：期刊论文

【摘要】：研究了304亚稳态奥氏体不锈钢在超低温和室温轧制变形过程中的宏、微观组织演变,变形引起的马氏体转变及其对合金性能的影响.结果表明,超低温轧制比室温轧制能更有效地加速马氏体转变,其中20%超低温轧制变形便可实现50%室温轧制变形下的马氏体转变量,且超低温轧制变形最终可实现完全的马氏体转变.同时,超低温轧制引起的马氏体转变在板厚方向上较均匀,显著优于室温轧制板材的板厚方向均匀性,有助于提高亚稳态奥氏体不锈钢板厚方向性能的均匀性.分析认为,亚稳态奥氏体不锈钢在超低温和室温轧制过程中具有不同的变形机理,前者主要以马氏体转变及其变形为主,后者以奥氏体变形为主.超低温轧制所获板材的硬度比室温轧制板材增长迅速,但随变形量增大位错密度差距缩小,最终导致两者硬度趋于一致.TEM表征结果表明,超低温和室温轧制过程中引起的马氏体与母相基体间的取向关系遵循K-S(Kurduumov-Sachs)关系.
[Abstract]:Study 304 metastable austenitic stainless steel in ultra low temperature and room temperature rolling deformation in the process of macro and microstructure evolution, deformation induced martensitic transformation and its influence on the properties of the alloy. The results show that the ultra low temperature rolling than room temperature rolling can effectively accelerate the martensitic transformation, including 20% ultra low temperature rolling deformation can be achieved martensite change the amount of 50% room temperature rolling deformation condition, and ultra low temperature rolling deformation at the martensitic transformation completely. At the same time, the martensitic transformation caused by ultra low temperature rolling in the direction of thickness is uniform, significantly higher than room temperature rolling sheet thickness uniformity, helps to improve the performance of the thickness direction of metastable austenite stainless steel plate uniformity. Analysis shows that the metastable austenitic stainless steel with different deformation mechanism in ultra low temperature and room temperature in the rolling process, the former mainly in the martensitic transformation and its change Mainly, the latter to Austenite Deformation. The ultra low temperature rolling plate hardness than room temperature rolling sheet is growing rapidly, but with the increase of deformation amount of dislocation density gap, resulting in both hardness consistent.TEM results showed that the orientation relationship between martensite and parent phase matrix caused by ultra low temperature and room temperature rolling process follow the K-S (Kurduumov-Sachs).
【作者单位】：北京科技大学新金属材料国家重点实验室;
【基金】：国家自然科学基金项目51401016 现代交通金属材料与加工技术北京实验室项目新金属材料国家重点实验室基金项目2011Z-05资助~~
【分类号】：TG337.5
【正文快照】： Manuscript received 2015-12-09,in revised form 2016-05-18强塑性变形(severe plastic deformation,SPD)是有效细化组织并获得亚微米/纳米结构的先进材料制备技术,能大幅提高材料强度并保证可观塑性,如等径挤压[1~5]、累积叠轧[6~8]、强烈扭转变形[9,10]及低温变形[11,12]

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