低温时效法消除DD8单晶高温合金的拉伸变形不均匀性  

Deformation Inhomogeneity of Single Crystal Superalloy DD8 Eliminated by Low Temperature Ageing

作　　者：刘金来[1] 张静华[1] 金涛[1] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所,沈阳110015

出　　处：《材料工程》2001年第2期15-16,共2页Journal of Materials Engineering

基　　金：航空基金资助项目

摘　　要：研究了消除 DD8单晶合金的变形不均匀性的方法和机理 ,发现增加 75 0℃ / 2 4h的低温时效处理后 ,可以消除DD8单晶高温合金中的拉伸变形不均匀现象 ,同时合金的屈服强度得到提高。观察表明 ,低温时效能阻止基体通道中应力诱导下小 γ′粒子的不均匀析出 ,保证滑移变形沿试样均匀分布。Method and mechanism for eliminating deformetion inhomogeneity of Ni base single ctystal superalloy DD8 was investigated It is found that deformation inhomogeneity in DD8 is eliminated by additional 750℃/24h low temperature ageing ,meanwhile yielding strength of the present alloy is raised It is demonstrated by TEM observation that the inhomogeneous precipitating of fine γ′ particle under induction of applied stress is prevented by low temperature ageing, thus the homogeneity of slip deformation along is attained

关 键 词：变形不均匀性 DD8单晶高温合金 拉伸变形 低温时效法 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TG111.7[金属学及工艺—合金]