不同晶粒尺寸FGH96合金热处理冷速研究  

Study on Heat-Treatment Cooling Rate of FGH96 Alloy with Different Grain Sizes

作　　者：崔金艳 尧健 何英杰 马向东 肖磊 郭建政 冯干江 Cui Jinyan;Yao Jian;He Yingjie;Ma Xiangdong;Xiao Lei;Guo Jianzheng;Feng Ganjiang(Shenzhen Wedge Central South Research Institute Co.,Ltd,Shenzhen 518000,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]深圳市万泽中南研究院有限公司,广东深圳518000 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2024年第1期242-249,共8页Rare Metal Materials and Engineering

基　　金：广东省珠江人才计划项目(607264877417);深圳市科技创新委员会项目(20150128085205453)。

摘　　要：在满足性能前提下,获取热处理工艺参数边界对优化FGH96涡轮盘性能意义重大,尤其是某一晶粒尺寸的FGH96合金在满足性能要求的前提下所需的最慢冷速边界。对不同晶粒尺寸、不同冷却速率的FGH96试样室温、650℃以及750℃的拉伸性能进行了研究,并对微观组织进行了观察。结果显示,和合金成分、晶粒尺寸、γ′尺寸和体积分数相关的多机制强化模型与实验测试结果吻合性好。利用该模型得到了最慢冷速与晶粒尺寸的匹配关系:当最慢冷速为55℃/min时,晶粒尺寸需小于14μm;当最慢冷速为72℃/min时,晶粒尺寸需小于16.8μm;当最慢冷速为81℃/min时,晶粒尺寸需小于20μm。最慢冷速边界值与晶粒尺寸关系可为通过数值模拟指导热处理工艺的制定提供判据。On the premise of performance satisfaction,to acquire the boundary of the heat treatment parameters is significant for property optimization of FGH96 turbine disks,especially the boundary of the minimum cooling of FGH96 alloy with certain grain size on the premise of performance satisfaction.The tensile behavior at 25,650 and 750℃of FGH96 specimens with different grain sizes was investigated during the cooling process from solution temperature at different cooling rates,and the microstructures were observed.The results show that the results obtained by the multi-mechanistic strengthening model including the effect of chemical composition,grain size,size and volume fraction ofγ′agree well with the experimental measurements.Through the strengthening model,the relationship between minimum cooling rate and grain size was studied:the grain size should be smaller than 14μm if the cooling rate is 55℃/min,the grain size should be smaller than 16.8μm if the cooling rates is 72℃/min,and the grain size should be smaller than 20μm if the cooling rates is 81℃/min.The relationship between minimum cooling rate and grain size can be used as a criterion for the guidance of parameter design of heat treatment process through simulation.

关 键 词：FGH96 最慢冷速边界 晶粒尺寸 多机制强化模型 

分 类 号：TG132.33[一般工业技术—材料科学与工程]