FGH4096高温合金的动态再结晶行为  

Dynamic recrystallization behavior for superalloy FGH4096

作　　者：刘剑箫 姜超 翟月雯 周乐育 金红 Liu Jianxiao;Jiang Chao;Zhai Yuewen;Zhou Leyu;Jin Hong(Beijing Research Institute of Mechanical and Electrical Technology Co.,Ltd.CAM,Beijing 100083)

机构地区：[1]中国机械总院集团北京机电研究所有限公司,北京100083

出　　处：《锻压技术》2023年第7期242-248,共7页Forging & Stamping Technology

基　　金：中国机械科学研究总院技术发展基金项目。

摘　　要：以真空等温锻造过程中再结晶组织的精细化和均质化调控为目标,在Gleeble3500热模拟试验机上进行热模拟压缩试验,分析变形温度为1020~1140℃、应变速率为0.001~1 s^(-1)、应变量为60%条件下FGH4096高温合金的高温变形行为。构建了FGH4096高温合金的动态再结晶体积分数模型和平均晶粒尺寸模型,揭示了合金热变形过程中动态再结晶组织演化规律,确定最佳工艺参数,通过控制加工窗口进而实现对微观组织的控制。试验结果表明,材料的临界应变随着变形温度的升高而降低,随着应变速率的增加而增加。原始组织的晶粒度为6级,当70.32<lnZ<75.57时,动态再结晶百分数大于90%;当72.62<lnZ<74.93时,再结晶平均晶粒尺寸的晶粒度为8级以上,获得均匀且细小的组织。Aiming at the refinement and homogenization control of the recrystallized microstructure in the vacuum isothermal forging process,the thermal simulation compression tests were conducted on Gleeble3500 thermal simulation tester,and the high temperature deformation behavior of alloy under the conditions of deformation temperature of 1020-1140℃,strain rate of 0.001-1 s^(-1) and strain amount of 60%was analyzed.Then,the dynamic recrystallization volume fraction model and average grain size model of superalloy FGH4096 were constructed,and the evolution laws of dynamic recrystallization microstructure during the thermal deformation process of the alloy was revealed.Furthermore,the optimal process parameters were confirmed,and the control of microstructure was realized by controlling the processing window.The experimental results show that the critical strain of the material decreases with increasing of the deformation temperature and increases with increasing of the strain rate.The grain size of the original structure is Grade 6,when lnZ is in the rang of 70.32-75.57,the dynamic recrystallization percentage is more than 90%.When lnZ is in the range of 72.62-74.93,the grain size of recrystallization average grain size is above Grade 8,resulting in uniform and fine structure.

关 键 词：FGH4096高温合金 热压缩变形 动态再结晶 平均晶粒尺寸 高温变形行为 

分 类 号：TG166.7[金属学及工艺—热处理]