锻压技术

2205双相不锈钢冷轧过程中磁性的研究

英文标题：Study on magnetism of 2205 duplex stainless steel during cold rolling

作者：冯志慧李静媛王一德

单位：北京科技大学

关键词：冷轧磁性铁素体测量仪

分类号：

出版年,卷(期):页码：2015,40(7):135-140

摘要：

针对2205双相不锈钢冷轧过程中磁性发生显著变化的问题，通过室温冷轧（70%压下率）的方法对冷轧前后材料的磁性用光学显微镜（OM）、铁素体测量仪、X-射线衍射和EBSD做了研究。结果表明：由于双相不锈钢常温下冷轧过程中α相不发生分解，且材料中Cr超过20%，γ相在冷轧过程中不容易发生马氏体转变，硬度测量也没有显示发生马氏体转变。铁素体仪测量冷轧后试样和原始铸态相比示数下降15%，主要来源于轧制过程中铁素体磁性的变化。冷轧过程中晶粒发生细化、铁素体在冷变形过程中位错发生缠结生成大量的亚晶界、变形导致的内应力场以及织构的影响，使铁素体的磁性发生显著的下降。

The question that why 2205 magnetic of duplex stainless steel dramatically changes during cold rolling was explained. The materials magnetism change before and after cold rolling was studied by cold rolling (up to the effective strain of 70%).The magnetism change was measured by optical microscopy (OM), ferrite meter measurement, X-ray diffraction and EBSD. The results show that, ferrite decomposition of dual phase stainless does not occur at the normal temperature during cold rolling, and there will be little stain-induced martensite transformation as Cr in material is more than 20%, and the content of hardness measurements also show no martensitic transformation. Compared with cast samples, the ferrite content value of cold rolling samples drops by 15% with ferrite meter. Among the related factors that might influence magnetism, the change of ferrite meter mainly comes from the ferrite magnetism change during cold rolling process. The influence from grain refinement, subgrain boundary generated by dislocation tangles, internal stress field caused by large deformation and texture will significantly decrease the magnetism of the ferrite.

基金项目：

国家自然科学基金资助项目(51174026)；十二五国家科技支撑计划(2012BAE04B02)

冯志慧(1988-)，女，博士研究生

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