Influence of microstructures on thermal fatigue property of a nickel-base superalloy

被引：6
|
作者：
Xia, Peng-Cheng [1 ,2 ]
Chen, Feng-Wen [1 ]
Xie, Kun [1 ]
Qiao, Ling [1 ]
Yu, Jin-Jiang [2 ]
机构：
[1] Shandong Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266590, Peoples R China
[2] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
来源：
FRONTIERS OF MATERIALS SCIENCE | 2015年 / 9卷 / 01期
基金：
中国国家自然科学基金;
关键词：
nickel-base superalloy; thermal fatigue; microstructure; crack; HIGH-TEMPERATURE; SINGLE-CRYSTAL; BEHAVIOR;
D O I：
10.1007/s11706-015-0277-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Effect of microstructures such as the distribution and shape of carbide and gamma' phase on thermal fatigue property of a superalloy was investigated experimentally. The resistance of thermal fatigue of the studied alloy decreases with the rising upper temperature. For the as-cast alloy, the thermal fatigue crack mostly origins from carbide at low upper temperature and results from oxidation at high upper temperature. The thermal fatigue crack of the heat treated alloy is mainly initiated by the oxidized cavity and then propagates through the join of the oxidized cavity. The orientation of crack propagation and direction of dendrite growth of alloy have the angle of 45A degrees. There is gamma' denuded region near the thermal fatigue crack because of oxidation.
引用
收藏
页码：85 / 92
页数：8
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