奥氏体逆相变对一种Fe-Mn-Al-C-Cr-V冷轧高强中锰钢组织性能的影响  

Influence of austenite reverse transformation on microstructure and properties of a Fe-Mn-Al-C-Cr-V cold-rolled high-strength medium-Mn steel

作　　者：王镜 徐鑫[2] 王鹏飞[3] 陈蓬 李小武 WANG Jing;XU Xin;WANG Peng-fei;CHEN Peng;LI Xiao-wu(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Technology Center of Anshan Iron&Steel Co Ltd,Anshan 114009,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料科学与工程学院材料物理与化学系,辽宁沈阳110819 [2]鞍钢股份有限公司技术中心,辽宁鞍山114009 [3]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《材料热处理学报》2025年第3期140-149,共10页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52171108);辽宁省自然科学基金联合基金(面上资助计划项目)(2023-MSBA-037);中央高校基本科研业务费(N2402007)。

摘　　要：高强度中锰钢凭借其优异的力学性能与成本优势,已成为汽车领域的研究热点,是最具发展潜力的第三代汽车用钢之一。微观组织调控是提升中锰钢力学性能的关键。以一种冷轧高强中锰钢Fe-5Mn-2Al-0.3C-0.8Cr-0.15V为研究对象,利用X射线衍射(XRD)、扫描电镜(SEM)、电子背散射衍射(EBSD)技术和电子万能试验机等研究了奥氏体逆相变处理对其相组成、微观结构和力学性能的影响。结果表明:随着两相区退火温度的升高,实验钢中的回火马氏体逐渐分解,残留奥氏体的体积分数呈现先增加后降低的趋势,极限抗拉强度先下降后上升,与总伸长率呈相互制约的关系;在750℃退火后,实验钢的显微组织为超细晶铁素体、残留奥氏体和新生马氏体组成的多相组织,其中残留奥氏体的体积分数为31.5%,在变形过程中表现出显著的相变诱发塑性(TRIP)效应,综合力学性能较为优异,极限抗拉强度为1316 MPa,总伸长率为15%。High-strength medium-Mn steel has become a research hotspot in the automotive field due to its excellent mechanical properties and cost advantages,and is one of the most promising third-generation automotive steels.Microstructure control is the key to improving the mechanical properties of the medium-Mn steel.The effect of austenite reverse transformation treatment on phase composition,microstructure,and mechanical properties of Fe-5Mn-2Al-0.3C-0.8Cr-0.15V cold-rolled high-strength medium-Mn steel was studied using X-ray diffraction(XRD),scanning electron microscopy(SEM),electron backscatter diffraction(EBSD)technique,and electron universal testing machine.The results show that with the increase of intercritical annealing temperature,the tempered martensite of the experimental steel gradually decomposes,the volume fraction of retained austenite shows a trend of first increasing and then decreasing,the ultimate tensile strength first decreases and then increases,and is mutually constrained with the total elongation.After annealing at 750℃,the microstructure of the experimental steel is a multiphase structure consisting of ultrafine grained ferrite,retained austenite and newly formed martensite.Moreover,the volume fraction of retained austenite is 31.5%,and it exhibits significant transformation-induced plasticity(TRIP)effect during deformation.The comprehensive mechanical properties of the experimental steel are relatively excellent,with an ultimate tensile strength of 1316 MPa and a total elongation of 15%.

关 键 词：中锰钢 两相区退火 残留奥氏体 相变诱发塑性效应 显微组织 力学性能 

分 类 号：TG142.3[一般工业技术—材料科学与工程]