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采用Gleeble-1500D热模拟试验机对SA508-3CL钢在变形温度800℃~1 200℃、应变速率0.001s-1~1s-1条件下进行热压缩实验,并将获得的真应力真应变数据引入Arrhenius型本构方程,通过多元线性回归计算,得到了SA508-3CL钢的变形激活能为422.455kJ·mol-1,同时建立了该钢的流变应力本构方程。将功率耗散图与失稳图叠加,得到了SA508-3CL钢在应变量为0.3、0.5和0.7时的热加工图,对在应变量为0.7时的热加工图及金相组织分析表明,该钢的组织缺陷主要是局部流变失稳,该钢的安全加工条件为温度1100℃~1200℃,应变速率0.01s-1~0.1s-1。
The hot compressive experiments of SA508-3CL steel with deformation temperature of 800 ℃ ~ 1 200 ℃ and strain rate of 0.001s-1 ~ 1s-1 were carried out by Gleeble-1500D thermal simulation test machine, and the real true strain data obtained were introduced Arrhenius-type constitutive equation was obtained by multivariate linear regression. The deformation activation energy of SA508-3CL steel was 422.455 kJ · mol-1, and the rheological stress constitutive equation of the steel was established. The power dissipation diagram and the steady state diagram are superimposed to obtain the hot working diagram of SA508-3CL steel at strain amounts of 0.3, 0.5 and 0.7. The hot working diagram and the microstructure analysis of SA508-3CL steel show that when the strain is 0.7, The microstructure defects of the steel are mainly local rheological instability, the safe processing conditions of the steel temperature 1100 ℃ ~ 1200 ℃, strain rate 0.01s-1 ~ 0.1s-1.