Martensite transformation of retained austenite with diverse stability and strain partitioning during tensile deformation of a carbide-free Bainitic steel
Martensite transformation of retained austenite with diverse stability and strain partitioning during tensile deformation of a carbide-free Bainitic steel
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无碳化物贝氏体钢拉伸变形过程中具有不同稳定性和应变分配的残余奥氏体马氏体转变
DOI：
10.1016/j.matchar.2021.111327
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发表时间：
2021-09
影响因子：
4.7
通讯作者：
H.L. Yi
中科院分区：
文献类型：
--
作者：
F.Y. Zhao;P. Chen;B.Y. Xu;Q. Yu;R.D.K. Misra;G.D. Wang;H.L. Yi
本文介绍了一种具有优良综合力学性能的无碳化物贝氏体钢。采用X射线衍射（XRD）、电子背散射衍射（EBSD）和透射电镜（TEM）相结合的方法，定量表征了不同工程应变条件下拉伸变形过程中奥氏体向不同形貌马氏体的转变行为。观察到不稳定的块状奥氏体在早期就开始转变，这与应变分配有关。板条（厚膜）奥氏体在较大应变下转变，而薄膜状（薄膜）奥氏体在整个变形过程中被认为是稳定的。板条奥氏体的转变改变了块状奥氏体的应变分配，导致块状奥氏体转变的变化。块状和板条奥氏体的TRIP效应的综合贡献占在变形后期的加工硬化率增加，因此良好的强度和塑性的组合。由于奥氏体相变的指数模型不适用于多尺度奥氏体，因此给出了实验钢奥氏体渐变相变行为的还原曲线。
A carbide-free bainitic steel characterized by an excellent combination of mechanical properties is presented here. The transformation behavior of austenite to martensite with different morphologies during tensile straining was quantitatively characterized by combination of X-ray diffraction (XRD), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) at different engineering strains. It was observed that the unstable blocky austenite started to transform at an early stage, which was associated with strain partitioning. The lath (thick-film) austenite transformed at larger strain, while the film-like (thin-film) austenite was regarded stable during the entire deformation process. The transformation of lath austenite altered strain partitioning in blocky austenite, leading to variation in transformation of blocky austenite. The combined contribution of TRIP effect of blocky and lath austenite accounted for the increased work hardening rate at the latter stage of deformation, and consequently good combination of strength and ductility. Given that the exponential model for austenite transformation was not appropriate for multiscale austenite, the reduction curves of gradual transformation behavior for austenite are presented for the experiment steel.
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