DD6单晶高温合金热处理过程中的再结晶组织演化  

Microstructural Evolution of Recrystallization During Heat Treatment in DD6 Single Crystal Superalloy

作　　者：曲彦平[1] 刘丽荣[1] 祖国庆[1] 金涛[2] 胡壮麒[2] 

机构地区：[1]沈阳工业大学,沈阳110870 [2]中国科学院金属研究所,沈阳110016

出　　处：《材料工程》2011年第8期14-18,共5页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(50901046)

摘　　要：研究DD6单晶高温合金塑性变形后热处理过程中的组织演化。结果表明,1500kg加载后,在铸态γ′相溶解温度以下预处理没有再结晶现象,预处理后再进行固溶处理发生明显的再结晶;γ′相溶解温度以上预处理发生明显的再结晶,再结晶晶界细小,晶界由粗大γ′相组成。与固溶态相比,时效处理后的再结晶深度变化不大,时效过程中,晶界由固溶态的窄晶界变为宽大的胞状晶界,并且有粒状M6C碳化物沿晶界析出。Microstructural evolution of recrystallization during heat treatment in DD6 single crystal superalloy were investigated.The results showed that during pre-treatment at the temperature up to as-cast γ′ phase solvus,no recrystallization occurred,while after solution treatment,rapid recrystallization occurred.During preheat treatment above the temperature,recrystallization occurred.The recrystallization grain boundary was thin and composed of bigger γ′ phase.Compared with the microstructure after solution treatment,the recrystallization depth after aging treatment had no obvious change.During aging treatment,grain boundary turned into wider cellular structure and some granular M6C carbide precipitated from grain boundary.

关 键 词：再结晶 热处理 DD6 单晶高温合金 

分 类 号：TG132.32[一般工业技术—材料科学与工程]