热变形工艺对GH720Li合金棒材颗粒状未再结晶组织演变行为的影响  

Effect of Hot Deformation Process on Evolution Behavior of Granular Unrecrystallized Microstructure in GH4720Li Alloy Bar

作　　者：李凯 东赟鹏 郝红军 兰博 于勇 林莺莺 LI Kai;DONG Yunpeng;HAO Hongjun;LAN Bo;YU Yong;LIN Yingying(Research and Engineering Technology Center of Plastic Forming,Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]北京航空材料研究院塑性成形研究与工程技术中心,北京100095

出　　处：《热加工工艺》2019年第5期60-62,67,共4页Hot Working Technology

摘　　要：为了破碎GH720Li合金棒材中颗粒状未再结晶组织,进行了不同工艺参数下的热压缩变形试验,采用OM观察了各工艺下的显微组织。结果表明,热变形过程中,颗粒状未再结晶组织由颗粒边缘向心部逐渐被破碎。变形温度越高,变形量越大,未再结晶组织的破碎程度越大。1100℃变形时,75%的变形量仍无法完全破碎未再结晶组织,高、低温复合变形能破碎未再结晶组织,但高温变形时长大的晶粒无法在低温变形时细化。In order to break the granular unrecrystallized microstructure in GH720Li alloy bar,the thermal compression deformation test was carried out under different technological parameters.The microstructure was observed by OM under various technologies.The results show that during thermal deformation,the granular unrecrystallized microstructure is gradually broken from the edge of the particle to the center.The higher the deformation temperature is,and the greater the amount of deformation is,the greater the breakage degree of unrecrystallized microstructure is.When the deformation tenperature is 1100 ℃,the 75% deformation quantity can not completely break the unrecrystallized microstructure.The high and low temperature composite deformation can break the unrecrystallized microstructure,but the grown grain at high temperature can not be refined at low temperature.

关 键 词：颗粒状未再结晶组织 变形温度 变形量 晶粒尺寸 

分 类 号：TG319[金属学及工艺—金属压力加工]