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利用Gleeble 3500热力模拟试验机对45、T8和T12钢淬火马氏体(M)组织进行单轴温压缩实验,变形温度为550~700℃,应变速率为1.0~0.001 s-1,测定3种钢M组织的应力-应变曲线,对比研究碳含量、变形温度和应变速率对其流变行为的影响。测试结果表明,同一应变速率随着变形温度的升高以及同一变形温度随着应变速率的降低,其M组织的流变应力都随之降低;由于材料的自扩散激活能随着碳含量的增加而减小,碳含量越高其回复再结晶速度越快,流变应力越低,使得中碳钢M组织的流变应力高于高碳钢,其中流变应力高低排列为:45钢>T8钢>T12钢。
The uniaxial compression tests were carried out on the quenched martensite (M) of 45, T8 and T12 steel with Gleeble 3500 thermal simulation test machine. The deformation temperature was 550-700 ℃ and the strain rate was 1.0-0.001 s-1. The stress-strain curves of steel M were compared to study the effect of carbon content, deformation temperature and strain rate on the rheological behavior. The results show that the same strain rate with the deformation temperature and the same deformation temperature decreases with the strain rate, the M strain flow stress decreases; due to the material self-diffusion activation energy as the carbon content increases While the higher the carbon content, the faster the recrystallization rate is. The lower the flow stress is, the higher the flow stress of M carbon steel is. The flow stress is arranged as follows: 45 steel> T8 Steel> T12 steel.