低温时效法消除DD8单晶高温合金的拉伸变形不均匀性

材料工程, 2001, (2): 15-16. doi: 10.3969/j.issn.1001-4381.2001.02.004

低温时效法消除DD8单晶高温合金的拉伸变形不均匀性

刘金来 ^1, , 张静华 ^2, , 金涛 ^3, , 胡壮麒 ^4,

1.中国科学院金属研究所，沈阳 110015

2.中国科学院金属研究所，沈阳 110015

3.中国科学院金属研究所，沈阳 110015

4.中国科学院金属研究所，沈阳 110015

基金项目: 航空基金

关键词：变形不均匀性 , 时效 , 单晶高温合金

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

Keywords： deformation inhomogeneity , ageing , single crystal superalloy

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750℃/24h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.

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