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本文介绍了使5CrNiMo钢的晶粒细化到<10μm所采用的热处理方法。在不同的温度及变形速度的条件下,测出了钢的延伸率与温度的关系曲线;流变应力与温度的关系曲线;logδ与logε的关系曲线以及应变速率敏感系数m与温度的关系曲线等。通过实验获得了562％的延伸率;又通过对ZG3/4″方头螺堵锻模模腔的超塑成形试验,证明了5CrNiMo钢在一定的温度与变形速度下挤压时,呈现很低的变形抗力。
This article describes the heat treatment method used to refine the grain size of 5CrNiMo steel to <10μm. Under different temperature and deformation rate conditions, the relationship between the elongation of steel and temperature was measured. The relationship between flow stress and temperature, the relationship between log δ and logε, and the dependence of strain rate sensitivity coefficient m on temperature Wait. Through experiments, the elongation of 562% was obtained. Through the superplastic forming test on the cavity of ZG3 / 4 "square head screw block forging die, it was proved that the steel of 5CrNiMo showed a very low level when it was pressed under a certain temperature and deformation rate The deformation resistance.