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利用MMS-300热力模拟实验装置对Nb、V、Ti微合金化Q550高强度结构钢进行了单道次压缩试验,研究了试验钢的高温变形行为,并建立了相应的流变应力模型。试验结果表明,变形抗力随变形温度的升高而降低,二者呈幂函数关系;变形抗力随应变速率的增大而增大,二者呈双对数关系。试验钢在峰值及稳定状态时形变激活能分别为329.55kJ/mol和295.31kJ/mol,且流变应力模型预测结果与试验结果吻合良好。
Single-pass compression test of Nb, V, Ti microalloyed Q550 high-strength structural steels was carried out by using MMS-300 thermal simulation experimental apparatus. The high-temperature deformation behavior of the test steels was studied and the corresponding flow stress model was established. The experimental results show that the deformation resistance decreases with the increase of deformation temperature, which shows a power function relationship. The deformation resistance increases with the increase of strain rate, showing a double logarithm relationship. The deformation activation energies of the test steel at the peak and steady state were 329.55kJ / mol and 295.31kJ / mol respectively, and the predictions of the flow stress model agree well with the experimental results.