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通过热模拟压缩实验研究了耐热合金CN617在变形温度为950~1 150℃、应变速率为0.01~10s-1条件下的热变形行为,修正了实验中由于摩擦和变形热效应引起的流变应力误差,并采用修正后的流变应力值,通过回归分析建立了CN617合金的热变形本构方程并绘制了热加工图。计算得出锻态耐热合金CN617热变形的热激活能平均为550kJ/mol。利用热加工图确定了CN617合金热变形时流变失稳区,分析得到了CN617合金流变失稳的原因是极少动态再结晶发生以及局部绝热变形带的形成。
The thermal deformation behavior of heat-resistant alloy CN617 under the temperature of 950 ~ 1 150 ℃ and the strain rate of 0.01 ~ 10s-1 was studied by means of thermal simulation and compression test. The flow stress caused by frictional and deformation thermal effects Error, and using the corrected flow stress value, the thermal deformation constitutive equation of CN617 alloy was established by regression analysis and the hot working diagram was drawn. The calculated thermal activation energy of heat deformation of as heat resistant alloy CN617 is 550kJ / mol. The thermal deformation curves of CN617 alloy during hot deformation were determined by the hot working drawing. The causes of the rheological instability of CN617 alloy were analyzed. It is found that there are very few dynamic recrystallization and the formation of local adiabatic deformation zone.