侯晓英,丁明凯,刘万春,郝亮,王业勤,初林

• 1:山东钢铁集团日照有限公司

摘要(Abstract)：

采用扫描电镜(SEM)、电子背散射衍射(EBSD)技术和透射电镜(TEM)对复相钢的微观形貌进行表征，并研究了其基于相变诱导塑性(TRIP)效应的强塑性机制。结果表明，将退火温度设定在单相奥氏体区和(γ+α)两相临界区，由于微观形貌特征的不同致使试验钢的力学性能有着显著的区别。退火温度(915℃)在单相奥氏体区时，微观组织由27%先共析铁素体、56%块状贝氏体以及分布于晶界处的17%残留奥氏体组成；组织中的先共析铁素体，其塑性优于再结晶铁素体，更有利于发挥协调变形作用，通过缓解应力对残留奥氏体的作用而有效发挥其TRIP效应；同时均匀分布于晶界处纵横比>2.0的块状残留奥氏体，在变形过程中由于受到相界面及块状硬质相贝氏体的阻碍，TRIP效应的贡献较大且可在整个应变阶段持续地发生。在晶粒尺寸、组织形貌、晶体学结构、V(C,N)析出和位错塞积，以及TRIP效应的共同作用下，915℃退火后复相钢的综合力学性能最优，屈服强度和抗拉强度分别为756和1135 MPa,强塑积可达到26.446 GPa·%,同时具有优良的伸长率和扩孔性能，分别为23.3%和56%。

关键词(KeyWords)： 复相钢;TRIP效应;强塑性机制;残留奥氏体稳定性;协调变形

Abstract:

Keywords:

基金项目(Foundation): 日照市自然科学基金项目(优秀青年基金项目)(RZ2021ZR10)

作者(Author): 侯晓英,丁明凯,刘万春,郝亮,王业勤,初林

DOI: 10.13289/j.issn.1009-6264.2023-0334

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