Mn偏析对0.3C-11Mn-2.7Al-1.8Si-Fe中锰钢力学性能的影响及作用机制

蔡星周, 刘胜杰, 张禹森, 李小龙, 张宇鹤, 张文彬, 陈雷, 金淼

Effect of Mn Segregation on Mechanical Properties of 0.3C-11Mn-2.7Al-1.8Si-Fe Medium Mn Steel and Its Mechanism

CAI Xingzhou, LIU Shengjie, ZHANG Yusen, LI Xiaolong, ZHANG Yuhe, ZHANG Wenbin, CHEN Lei, JIN Miao

表2 S1 (粗、细晶区)和S2样品中奥氏体的合金元素含量与晶粒尺寸及奥氏体特征结果

Table 2 Alloying element contents and grain size of austenite and its characteristics in S1 (coarse and fine grain regions) and S2 samples

Sample Composition of austenite Grain size Vγ Md30 γSFE Deformation (mass fraction / %) μm % oC mJ·m-2 mechanism C Mn Al Si S1 (rich Mn) 0.74 13.12 2.12 2.10 8.52 92.4 108.33 10.44 TRIP S1 (low Mn) 0.73 11.15 2.25 1.90 1.58 73.1 123.84 16.45 TRIP + TWIP S2 0.73 11.72 2.23 1.93 1.56 69.3 118.91 15.62 TRIP + TWIP