基于热加工图的inconel 690合金挤压工艺参数研究

在Gleeble-3500热模拟试验机上,利用热压缩变形研究了镍基耐蚀合金inconel690的热变形特性,温度为1100℃～1250℃、应变速率为1.0s-1～60s-1,建立inconel690的热变形本构方程,在计算功率耗散效率的基础上,使用动态模型理论,绘制了inconel690的热加工图,其热激活能约465kJ/mol,在应变0.34～0.8内,inconel690的热加工图是相似的,热加工图表明,计算耗散功率系数有两个峰值区,为1130℃and60s-1及1250℃and1.0s-1;功率耗散效率值为36%～50%,两区域变形试件的金相观察表明,镍基耐蚀合金inconel690发生动态再结晶,晶粒细小均匀。

The study on the hot extrusion working parameters of inconel 690 based on processing maps

The hot deformation characteristics of Ni-based superalloy-inconel 690 are studied at the temperature 1100℃～1250℃ and the strain rate 1.0s~(-1)～60s~(-1) in hot compression tests.Processing maps for hot working are developed based on the calculating dissipation efficiency of power with a dynamic theoretical model used.A hot deformation equation is given to characterize the dependence of peak stress on the temperature and strain rate.The activation energy of the material under hot deformation is about 465kJ/mol.The processing maps obtained within the strain range 0.34～0.8 are similar.The maps show that the coefficient of the calculating dissipation power reach its peak value around 1130℃/60s~(-1) and 1250℃/1.0s~(-1) with the peak efficiency about 36%～50%.On the basis of micro-structural observation,the region fully recrystallized in the processing map can be identified in accordance with the strain value about 0.7.