Xiong Zhiping, Casillas Gilberto, Saleh Ahmed A, Cui Shaogang, Pereloma Elena V
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia.
Electron Microscopy Centre, University of Wollongong, Wollongong, NSW, 2519, Australia.
Sci Rep. 2017 Dec 12;7(1):17397. doi: 10.1038/s41598-017-17824-x.
For the first time, deformation twinning and martensitic transformation were observed in retained austenite in a low-alloyed transformation-induced plasticity steel using nanoindentation in conjunction with electron backscattering diffraction and transmission electron microscopy. Dislocation glide, martensite formation and deformation twinning were correlated to pop-ins and deviation from linearity in the load-displacement curve. Deformation twinning was found to enhance the stability of retained austenite. This observation furthers our understanding of RA stability during straining of low-alloyed multiphase TRIP steel.
首次在低合金相变诱发塑性钢的残余奥氏体中，通过纳米压痕结合电子背散射衍射和透射电子显微镜观察到形变孪晶和马氏体转变。位错滑移、马氏体形成和形变孪晶与载荷-位移曲线中的载荷突升和线性偏差相关。发现形变孪晶可提高残余奥氏体的稳定性。这一观察结果进一步加深了我们对低合金多相TRIP钢应变过程中残余奥氏体稳定性的理解。
