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采用场发扫描电镜和EPMA电子探针研究了C-Si-Mn系双相钢锰配分行为及其对马氏体形貌、体积分数和力学性能的影响。结果表明:试验用钢0.20C-1.28Mn-0.37Si在经双相区热处理后,在720℃的淬火温度下,随着保温时间的延长,锰元素由铁素体向奥氏体中的配分量不断增加,达到化学势平衡(即饱和状态)所需的保温时间为1500s;马氏体体积分数随着保温时间的延长而增加,达到饱和的时间是1300s;抗拉强度随着保温时间的延长而升高,当达到某一时间时,抗拉强度保持恒定。
The effects of the distribution of manganese on the morphology, volume fraction and mechanical properties of martensite in C-Si-Mn dual phase steel were investigated by field emission scanning electron microscopy and EPMA electron probe. The results show that with the increase of holding time, the distribution of manganese from ferrite to austenite in the test steel 0.20C-1.28Mn-0.37Si after heat treatment in the dual-phase zone at the quenching temperature of 720 ℃, The volume of martensite increases as the holding time increases, the time to reach saturation is 1300s; the tensile strength increases with the holding time Extend and rise, when reaching a certain time, the tensile strength remains constant.