基于热加工图的inconel 690合金挤压工艺参数研究  

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

作　　者：吕亚臣[1] 任运来[1] 聂绍珉[1] 

机构地区：[1]燕山大学机械工程学院,秦皇岛066004

出　　处：《塑性工程学报》2009年第6期39-44,共6页Journal of Plasticity Engineering

基　　金：国家"十一五"科技支撑项目(2007BAF02B00)

摘　　要：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 hot deformation characteristics of Ni based superallo^inconeI 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 calculat ing 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. 3440.8 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.

关 键 词：挤压 镍基耐蚀合金 耗散效率 热加工图 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG376.2[金属学及工艺—金属材料]