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采用Gleeble-3500热力模拟机分别用0.1、1、10 s~(-1)的应变速率对ZG25MnCrNiMo钢进行了热压缩变形试验,研究了应变速率对试样显微组织和硬度的影响。结果表明,当变形温度低于Ac_1时,试样组织为铁素体+珠光体,应变速率对组织形态影响不大,随着应变速率的增加,显微硬度先升高后降低,但变化幅度很小;当变形温度在Ac_1~Ac_3时,试样组织为索氏体+少量板条马氏体和铁素体,随着应变速率增加,板条马氏体的含量逐渐增加,铁素体含量逐渐减少,显微硬度逐渐升高;当变形温度高于Ac_3时,试样的显微组织为板条马氏体,随着应变速率增加,马氏体组织逐渐粗化,显微硬度降低。
The hot compressive deformation of ZG25MnCrNiMo steel was carried out with Gleeble-3500 thermal simulator at the strain rate of 0.1,1,10 s ~ (-1) respectively. The effect of strain rate on the microstructure and hardness of the sample was investigated. The results show that when the deformation temperature is lower than Ac_1, the microstructure of the sample is ferrite + pearlite, and the strain rate has little effect on the microstructure. With the increase of strain rate, the microhardness first increases and then decreases, but the change range Small; when the deformation temperature Ac_1 ~ Ac_3, the sample is organized as sorbite + a small amount of lath martensite and ferrite, with the strain rate increases, the lath martensite content gradually increased, ferrite When the deformation temperature is higher than Ac_3, the microstructure of the sample is lath martensite. As the strain rate increases, the martensite structure gradually coarsens and the microhardness decreases .