冷轧变形量对Mn12Ni2MoTi(Al)钢层状双相结构的影响
张香阁，伍翠兰*，沈书成，朱 恺
(湖南大学材料科学与工程学院高分辨电镜中心，湖南 长沙 410082)
摘 要 采用扫描电镜(SEM)、X射线衍射(XRD)、背散射电子衍射(EBSD)、电子探针(EPMA)和室温单轴拉伸实验研究了冷轧变形量及后续退火对Mn12Ni2MoTi(Al)钢的层状结构微观组织及其拉伸性能的影响。结果表明：冷轧变形量越大，退火后越容易形成奥氏体(γ)、马氏体或铁素体(α)交替排列的层状双相结构；745℃1h+480℃1h二次退火有利于材料中奥氏体含量的提高，并有利于γ/α'层状结构的形成；层状双相结构组织往往存在强烈的织构和Mn元素的偏聚。当双相钢具有层状结构时，其强度和塑性同时提高。
关键词 冷轧量；Mn12Ni2MoTi(Al)钢；形变热处理；层状结构
中图分类号：TG142.1；TG142.41；TG142.33；TG161;TG115.21+5.3 文献标识码：A doi:10.3969/j.issn.1000-6281.2019.06.008
Effect of cold rolled reduction on microstructure and tensile properties of Mn12Ni2MoTi(Al) steel
ZHANG Xiang-ge, WU Cui-lan*, SHEN Shu-cheng, ZHU Kai
(Center for High-Resolution Electron Microscopy, College of Materials Science and Engineer，
Hunan University，Changsha Hunan 410082，China)
Abstract Theeffect of cold rolling reduction and sequenced annealing on the microstructure and tensile properties of Mn12Ni2MoTi(Al) steel with laminate structures were investigated by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD), electron probe micro-analyzer (EPMA) and room-temperature uniaxial tensile test.The results show that the larger the cold rolling reduction, the easier the laminate structures with austenite (γ) / martensite or ferrite (α) will be after annealing. The 745℃1h+480℃1h two steps annealing is beneficial to increase the austenite content of this steel and to form the laminate structures with γ/α'. The laminate structures usually have strong texture and Mn segregation in austenite. When the Mn-high steel consists of the laminate structures with γ/α', the strength and plasticity both are improved.
Keywords cold rolling reduction；Mn12Ni2MoTi(Al) steel；thermo-mechanical treatment；laminate structures
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