热成形工艺对GH5188钴基高温合金薄板晶界特征分布的影响  

Effects of hot forming process on grain boundary characteristic distribution of cobalt-base superalloy GH5188 sheet

作　　者：薛润东 王成猛 万润 Xue Rundong;Wang Chengmeng;Wan Run(Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijng 100083,China)

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《锻压技术》2024年第4期68-75,共8页Forging & Stamping Technology

摘　　要：采用热处理和热模拟试验探究温度与变形量对GH5188钴基高温合金薄板晶界特征分布的影响,通过电子背散射衍射对不同热成形工艺下的GH5188钴基高温合金进行分析表征,探索优化GH5188钴基高温合金晶界特征分布的工艺。研究表明,热处理温度为1050℃时重合位置点阵(CSL)晶界比例最大,此时样品中产生大量∑3晶界及其他低∑CSL晶界,且有汇聚成晶界团簇的趋势。CSL晶界的数量随着变形量的增大而减少,小角度晶界比例随之增加,孪晶趋向于沿纵向排列。热成形后,∑3晶界比例峰值所对应的温度由1050℃下降至1000℃,热成形条件为1000℃、10%变形量时,CSL晶界比例最大,达到43%。∑3晶界占CSL晶界总体的70%以上,其特征分布是晶界优化的关键。The effects of temperature and deformation amount on the grain boundary characteristic distribution of cobalt-base superalloy GH5188 sheet were investigated by heat treatment and thermal simulation experiments,and the cobalt-base superalloy GH5188 under different hot forming processes was analyzed and characterized by electron backscatter diffraction(EBSD),in order to explore the process of optimizing the grain boundary characteristic distribution for cobalt-base superalloy GH5188.The research indicats that the grain boundary proportion coincident site lattice(CSL)is maximum at the heat treatment temperature of 1050℃,while a significant number of∑3 grain boundaries and other low-∑CSL grain boundaries are generated,showing a tendency to aggregate into grain boundary clusters.The quantity of CSL grain boundaries decreases with the increasing of deformation amount,accompanied by an increase in the proportion of small-angle grain boundaries,and the twin crystal tends to align longitudinally.After hot forming,the temperature corresponding to the peak proportion of∑3 grain boundaries decreases from 1050℃to 1000℃.Under the hot forming conditions of 1000℃and 10%deformation amount,the CSL grain boundaries proportion is maximum,reaching at 43%.The characteristic distribution of∑3 grain boundaries is the key for the grain boundary optimization,which accounts for over 70%of the overall CSL grain boundaries.

关 键 词：GH5188钴基高温合金 温度 变形量 ∑3晶界 晶界特征分布 

分 类 号：TG132.3[一般工业技术—材料科学与工程]