DD98合金重凝行为的研究  

Resolidification Behavior of DD98 Superalloy

作　　者：孙长波[1] 孟祥斌[2,3] 李金国[2] 金涛[1,2] 孙晓峰[2] 胡壮麒[2] 

机构地区：[1]中航工业沈阳黎明航空发动机(集团)有限责任公司,辽宁沈阳110043 [2]中国科学院沈阳金属研究所,辽宁沈阳110016 [3]中国科学院研究生院,北京100049

出　　处：《铸造》2011年第5期446-449,共4页Foundry

摘　　要：研究了第二代单晶高温合金DD98在标准固溶处理温度±50℃内,合金组织对热处理制度的响应。结果表明,合金的显微组织除与热处理温度和冷却速率密切相关外,还与晶体取向有关,<001>取向的单晶合金初熔温度比<011>和<111>高约5℃。当热处理温度较高时,单晶枝晶间区域发生初熔,重熔后在重凝区域中γ′相以离异共晶方式规则析出,分布规律与母相一致。The response of secondary generation superalloy microstructure to the heat treatment process at standard solution treatment temperature ±50 ℃ was investigated.The results show that the microstructures have close correlation not only with the heat treatment temperature,the cooling velocity,but with the crystal orientation;the incipient melting temperature of the single crystal superalloy with001 orientation is 5 ℃ higher than that of the superalloy with 011 and 111 orientation.In the resolidification zone,the γ′ phase is precipitated in the form of separated eutectic,which distributes the same as the parent phase.

关 键 词：NI基单晶高温合金 初熔 重凝 离异共晶 

分 类 号：TG132.32[一般工业技术—材料科学与工程]