Deformation mode and strain path dependence of martensite phase transformation in a medium manganese TRIP steel
Deformation mode and strain path dependence of martensite phase transformation in a medium manganese TRIP steel
复制标题
DOI：
10.1016/j.msea.2017.11.008
复制
发表时间：
2018-01
期刊：
影响因子：
6.4
通讯作者：
Wei Wua;Yu-Wei Wanga;Panagiotis Makrygiannisa;Feng Zhua;Grant A. Thomasb;L. Hector;Xiaohua Hud
中科院分区：
文献类型：
--
作者：
Wei Wua;Yu-Wei Wanga;Panagiotis Makrygiannisa;Feng Zhua;Grant A. Thomasb;L. Hector;Xiaohua Hud
通过结合 3D 数字图像相关和同步加速器 X 射线衍射，对冲压成 T 形面板的中锰 (10 wt%) TRIP 钢中的马氏体相变依赖于变形模式和应变路径进行量化。 T 形模仿了常见防入侵组件的一部分。冲压速度故意保持较慢（1 毫米/秒），以避免产生过多热量。选择该钢属于第三代先进高强度钢（3GAHSS）系列，有两个原因：（1）它是两相的，即奥氏体和铁素体，其中马氏体是由变形引起的相变产生的； (2) 66vol.% 的初始残余奥氏体体积分数 (RAVF) 能够在大变形水平下彻底检查马氏体相变，而无需耗尽。应变场与从成型 T 形板上特定位置提取的小样本的 RAVF 测量值相结合。这使得能够探索线性、双线性和非线性应变路径以及变形模式（例如拉伸、平面应变、双轴拉伸和等双轴拉伸）的影响。结果表明，在不存在断裂且马氏体相变不受成形过程中产生的热量影响的情况下，马氏体相变显着依赖于变形模式和应变路径。一般来说，单轴和双轴拉伸变形模式有利于马氏体相变，而平面应变下马氏体相变量最小。讨论了本研究中详述的实验方法在其他 3GAHSS 中的进一步应用以及断裂对马氏体相变的影响。
The martensite phase transformation dependence upon deformation modes and strain paths in a medium manganese (10 wt%) TRIP steel stamped into a T-shape panel was quantified through combination of 3D digital image correlation and synchrotron X-ray diffraction. The T-shape emulates a portion of a common anti-intrusion component. The stamping speed was kept intentionally slow (1 mm/s) so as to avoid excessive heat generation. The steel, which belongs to the third generation advanced high strength steel (3GAHSS) family, was chosen for two reasons: (1) it is two-phase, i.e. austenite and ferrite, with martensite resulting from deformation-induced phase transformation; (2) the 66vol.% initial retained austenite volume fraction (RAVF) enabled a thorough examination of the martensite phase transformation at large deformation levels without exhaustion. Strain fields were coupled with measured RAVF values of small specimens extracted from specific locations on a formed T-shape panel. This enabled an exploration of the effects of linear, bilinear, and non-linear strain paths as well as deformation modes such as tension, plane strain, biaxial tension, and equibiaxial tension. Results suggest a significant martensite phase transformation dependence on deformation mode and strain path in the absence of fracture and when martensite phase transformation is unaffected by heat generated during forming. In general, the uniaxial and biaxial tension deformation modes facilitate the martensite phase transformation, while the smallest amount of martensite phase transformation occurs under plane strain. Some discussion as to further application of the experimental methods detailed in this study to other 3GAHSS and the effects of fracture on martensite phase transformation is provided.