固溶处理对一种第四代镍基单晶高温合金微观组织和偏析的影响  

The influence of solution treatment temperature on the microstructure and microsegregation of a fourth generation nickel-based single crystal superalloy

作　　者：赵新宝 岳亮 夏万顺 岳全召 贝红斌 韦华 魏晓[1] 张泽[1] ZHAO Xin-bao;YUE Liang;XIA Wan-shun;YUE Quan-zhao;BEI Hong-bin;WEI Hua;WEI Xiao;ZHANG Ze(Institute of Superalloy Science and Technology,School of Materials Science and Engineering,Zhejiang University,Hangzhou Zhejiang 310027;Center for Hypergravity Experimental and Interdisciplinary Research,Zhejiang University,Hangzhou Zhejiang 310027,China)

机构地区：[1]浙江大学高温合金研究所,材料科学与工程学院,浙江杭州310027 [2]浙江大学超重力研究中心,浙江杭州310027

出　　处：《电子显微学报》2020年第5期462-469,共8页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.51988101,No.91960201);浙江省重点研发计划资助项目(No.2020C01002);浙江省自然科学基金资助项目(No.LY20E010004);中央高校基本科研业务费专项资金(No.2019QNA4012)。

摘　　要：利用扫描电子显微镜及能谱研究了固溶处理温度对一种第四代镍基单晶高温合金微观组织和枝晶偏析的影响。结果表明:铸态合金中存在显著的成分偏析,其中Ru和Mo的偏析系数接近1;随着固溶温度的升高,枝晶组织形貌特征退化,成分偏析明显减轻,但在1 360℃固溶时合金部分组织出现初熔,限制了固溶温度上限。提高最高固溶温度可一定程度增大γ′相尺寸,显著降低合金的微观偏析,但Re和W元素在高温固溶后仍存在明显的残余偏析。The effect of solution treatment temperature on the microstructure and dendritic microsegregation of a fourth generation nickel-based single crystal superalloys was investigated by scanning electron microscopy and energy dispersive spectrometer.The results show that many elements significantly microsegregate in the as-cast superalloy.Ru and Mo is relatively homogeneous with their segregation coefficients are close to 1.As the solution temperature increases,the dendritic microstructure degrades and the elemental segregation alleviated obviously.However,local initial melting occurs at 1360℃,which limits further temperature increase.Higher solution temperature can result in larger size ofγ'phase,and effectively reduce the dendrite segregation of the superalloy.However,even in the highest solution treatment temperatures of this study,the microgregation of Re and W still have not completely eliminated.

关 键 词：镍基单晶高温合金 固溶处理 微观形貌 枝晶偏析 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TG146.4[金属学及工艺—合金]