耐热合金热压缩修正后本构方程及热加工图  

Corrected constitutive equation and processing maps of nickel-based heat-resistant alloy CN617 after hot compression test

作　　者：陈正宗[1] 刘正东[1] 包汉生[1] 

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081

出　　处：《钢铁研究学报》2015年第9期44-48,共5页Journal of Iron and Steel Research

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA03A501);中瑞联合实验室先进耐热耐磨材料研究资助项目(2012DFG51670);国家能源应用技术研究及工程示范项目(NY20110102-1)

摘　　要：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550 kJ/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 hot deformation hehavior of the forged heat-resistant alloy CN 617 were analyzed at 950-- 1 150℃, in strain rate range of 0.01--10 s^-1 by the compression tests, the errors in flow stress caused by friction and ther- mal effect were corrected. Constitutive equation of alloy CN617 at high temperature is established by curvilinear regression method and processing map is developed on the basis of the corrected flow stress values. The average apparent activation energy for hot working is calculated to be 550 kJ/mol. The instability regime of CN617 alloy is confirmed using the processing maps, the reason of that is less of the incomplete dynamic recrystallization and the formation of localized adiabatic shear bands.

关 键 词：CN617耐热合金 修正 本构方程 热加工图 

分 类 号：TG132.3[一般工业技术—材料科学与工程]