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利用Gleeble 1500D热模拟试验机,在应变速率为0.01~10 s-1、变形温度为1000~1150℃、变形量为60%的条件下对铸态42Cr Mo钢的高温塑性变形特性进行了研究。结果表明,材料的流变应力随变形温度的升高而减小,随应变速率的增大而增大;试验钢的峰值应力激活能Q=325.63 k J/mol,稳态应力激活能Q=271.84 k J/mol;变形过程中动态再结晶晶粒平均尺寸随温度的增大而增大,随应变速率的增大而减小,其自然对数与Zener-Hollomon参数的自然对数成线性关系。
The high temperature plastic deformation behavior of as-cast 42Cr Mo steel was studied by using Gleeble 1500D thermal simulator at a strain rate of 0.01-10s-1, a deformation temperature of 1000-1150 ℃ and a deformation of 60%. The results show that the flow stress decreases with the increase of deformation temperature and increases with the increase of strain rate. The peak stress activation energy Q = 325.63 kJ / mol and the steady state stress activation energy Q = 271.84 kJ / mol. The average size of dynamic recrystallization grains increased with increasing temperature and decreased with the increase of strain rate, and the natural logarithm was linear with the natural logarithm of Zener-Hollomon parameter relationship.