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采用热模拟单道次压缩试验研究了形变温度、形变量及冷却速率对中碳锰钢的组织影响。结果表明:在高于A3点(779℃)的形变过程中,珠光体体积分数随形变温度的降低先增后减,且在860℃附近出现极大值。试样在860℃形变后,随形变量的增加,珠光体体积分数逐渐减小;而随冷却速率的提高(≤20℃/s),奥氏体会发生伪珠光体转变,珠光体体积分数呈递增的趋势,同时铁素体晶粒得到细化且主要沿晶界分布,因此通过合理控制形变参数及冷速可获得较理想的铁素体+珠光体组织,提高材料的性能。
The effects of deformation temperature, amount of deformation and cooling rate on the microstructure of medium carbon manganese steel were investigated by single-pass thermal simulations. The results show that the volume fraction of pearlite firstly increases and then decreases with the decrease of deformation temperature at the deformation higher than A3 (779 ℃), and the maximum appears near 860 ℃. With the increase of deformation, the volume fraction of pearlite gradually decreases after the specimen is deformed at 860 ℃. However, with the increase of cooling rate (≤20 ℃ / s), the pearlite transformation occurs and the volume fraction of pearlite The ferrite grains are refined and mainly distributed along the grain boundaries. Therefore, the ideal ferrite + pearlite structure can be obtained through reasonable control of deformation parameters and cooling rate to improve the material properties.