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利用MMS-300热/力模拟实验机,在变形温度850℃~1150℃、应变量0~0.8和应变速率0.01s-1~10s-1条件下对20CrNi2Mo钢进行高温单道次压缩实验,分析变形温度、变形速率和变形程度对变形抗力的影响。结果表明,变形温度和变形速率对20CrNi2Mo钢变形抗力的影响最为强烈:20CrNi2Mo钢变形抗力随变形温度的升高而减小,随变形速率的提高而增大;且变形温度、变形速率和应变量3个因素之间相互作用,共同影响变形抗力。利用多元非线性回归建立了20CrNi2Mo钢高温变形抗力数学模型,与实测值比较表明,模型拟合程度较好。
The single-pass high-temperature compression experiments of 20CrNi2Mo steel were carried out with MMS-300 thermal / mechanical simulator at deformation temperature of 850 ℃ ~ 1150 ℃, strain of 0 ~ 0.8 and strain rate of 0.01s-1 ~ 10s-1 Effect of Deformation Temperature, Deformation Rate and Degree of Deformation on Deformation Resistance. The results show that the deformation temperature and deformation rate have the strongest effect on the deformation resistance of 20CrNi2Mo steel. The deformation resistance of 20CrNi2Mo steel decreases with the increase of deformation temperature and increases with the increase of deformation rate. The deformation temperature, deformation rate and strain amount Interaction between the three factors, together affect the deformation resistance. The mathematical model of high temperature deformation resistance of 20CrNi2Mo steel was established by multivariate nonlinear regression. Compared with the measured values, the model fitting is better.