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通过热压缩试验研究9Cr-2W耐热合金在1000～1300℃和应变速率0.005～0.5s-1范围内的流变行为和热变形组织演变,并对热镦粗试样做了织构测定。分析该合金在实验参数范围内热变形的应力-应变特征,动力学方程,获得应力指数和变形激活能等表征其变形能力的重要特征参数。组织观察和织构测试结果表明,9Cr-2W耐热合金热变形过程中组织演变机制以动态回复和几何动态再结晶方式进行。在实际生产中,可以选择较高的变形温度来降低流变应力和改善各向异性。
The hot deformation behavior and hot deformation microstructure evolution of 9Cr-2W heat-resistant alloy in the temperature range of 1000 ~ 1300 ℃ and strain rate of 0.005 ~ 0.5s-1 were investigated by hot compression test. The stress-strain characteristics, dynamic equations, and the important characteristic parameters such as stress index and deformation activation energy to characterize the deformation capacity of the alloy during the experimental parameters were analyzed. Tissue observation and texture test results show that the microstructure evolution mechanism of 9Cr-2W heat-resistant alloy during dynamic deformation is characterized by dynamic recovery and geometric dynamic recrystallization. In actual production, you can choose a higher deformation temperature to reduce flow stress and improve anisotropy.