Research on Monotonic Tension Deformation and Fracture Behavior of the High Manganese Hadfield Steel
XIAO Gang1,2,3, BU Xiaobing4, YANG Qinwen1, YANG Xujing1, FENG Jianghua2
1 State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082 2 CRRC Zhuzhou Institute Co., Ltd, Zhuzhou 412001 3 Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material, Hunan University of Science and Technology, Xiangtan 411201 4 China Automotive Technology & Research Center Co., Ltd, Tianjin 300300
Abstract: The monotonic tensile test of the high manganese Hadfield steel has been investigated at various strain rates of 6×10-3 s-1, 6×10-4 s-1, 3×10-5 s-1and 6×10-6 s-1. The deformation behavior and the crack initiation and propagation phenomenon of the steel have been analysed. The results illustrate that the studied alloy shows dynamic strain aging under all the selected strain rates. The ductility exhibits a positive strain rate sensitivity. A mass of dislocations and stacking faults are generated in the austenite grain after deformation, together with the generation of parallel tiny deformation twins. The strain hardening rate experiences three stages of “decrease—increase—decrease”, in which the second stage attributes to the continuous produce of deformation twins. The high density slip band perpendicular to the tension direction is beneficial for the initiation of crack. The crack is propagated in the transgranular form, together with propagation along twin form. The competition between gliding and twinning is the main deformation mechanism of the tested steel.
肖罡, 卜晓兵, 杨钦文, 杨旭静, 冯江华. 高锰Hadfield钢单向拉伸变形及断裂行为研究[J]. 材料导报, 2019, 33(22): 3811-3814.
XIAO Gang, BU Xiaobing, YANG Qinwen, YANG Xujing, FENG Jianghua. Research on Monotonic Tension Deformation and Fracture Behavior of the High Manganese Hadfield Steel. Materials Reports, 2019, 33(22): 3811-3814.