Cr12Mo1V1钢组织的高温转变行为

使用高温金相技术观察研究了Cr12Mo1V1模具钢加热至950和1 200℃的升温过程、保温过程和冷却过程中的组织转变和碳化物溶解情况。试验结果表明,升温过程中,铁素体组织会呈现黑色,随着温度升高,会发生铁素体向奥氏体转变,在高温金相中表现为黑色组织向灰白色组织转变;保温过程中,将会发生碳化物明显溶解现象,在高温金相中,碳化物溶解呈现黑色颗粒尺寸逐渐增大,数量逐渐减少的现象,大颗粒共晶碳化物将会发生溶断和粒化;冷却过程中会发生马氏体转变,随着奥氏体化温度的升高,马氏体的结构会更细。

High temperature phase transition behavior of Cr12Mo1V1 steel

The phase transformation and carbide dissolution of Cr12Mo1V1mold steel during heating to 950 and 1200℃, holding for 10min and cooling process were researched by high temperature metallograph. The experimental results show that the ferrite exhibits black during the heating process. And with further increase in temperature, the ferrite transform to austenite, in consistence with the color change in the high temperature metallograph from black to gray. During the insulation process, significant carbide dissolution occurs. As the high temperature metallograph shows, the size of black particles gradually increases while the number gradually decreases, and large eutectic carbides dissolute and granulate. In cooling process, martensite transformation could be observed, and the martensite grain becomes finer as the austenitizing temperature increases.