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采用Gleeble-1500热模拟试验机对T91圆柱试样在变形温度800~1050℃和0.1~10/s的变形速率范围内进行压缩试验。研究了变形温度、应变速率及变形程度对T91钢变形抗力的影响。结果表明,T91钢是温度敏感性材料,随变形温度升高,材料的变形抗力明显降低;但T91钢是一个与温度区域有关的速率敏感材料,仅当变形温度高于800℃以上,变形抗力才会随变形速率增加而迅速增大。通过对应力-应变曲线的回归,构建了T91钢的高温本构方程。
The compression tests of T91 cylindrical specimens were carried out in the deformation rate of 800 ~ 1050 ℃ and the deformation rate of 0.1 ~ 10 / s by Gleeble-1500 thermal simulation machine. The effects of deformation temperature, strain rate and degree of deformation on the deformation resistance of T91 steel were studied. The results show that, T91 steel is a temperature-sensitive material, with deformation temperature increases, the material deformation resistance significantly reduced; but T91 steel is a temperature-sensitive rate-sensitive materials, and only when the deformation temperature is above 800 ℃, deformation resistance Will increase with the deformation rate increases rapidly. Through the regression of stress-strain curve, the constitutive equation of high temperature for T91 steel is established.