Failure behavior of coated nickel-based superalloy under thermomechanical fatigue

被引：0
|
作者：
Z. B. Chen
Z. W. Huang
Z. G. Wang
S. J. Zhu
机构：
[1] Chinese Academy of Sciences,Shenyang National Laboratory for Materials Science, Institute of Metal Research
[2] Fukuoka Institute of Technology,Department of Intelligent Mechanical Engineering
来源：
Journal of Materials Science | 2009年 / 44卷
关键词：
Crack Initiation; Crack Density; High Velocity Oxygen Fuel; Coated Specimen; DBTT;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Thermomechanical fatigue (TMF) is a major life limiting factor for gas turbine blades. In this study, the failure behavior of NiCrAlY overlay coated nickel-based superalloy M963 was investigated under out of phase (OP) TMF. All tests were carried out under mechanical strain control with a cyclic period of 200 s. Results revealed that the fatigue life of high velocity oxygen fuel spraying (HVOF) coated specimen was longer than that of air plasma spraying (APS) coated one, but shorter than that of bare superalloy M963 at a given strain range. It was found that cracking process in the APS coating was different from that in the HVOF coating, which was shown by the sketches to understand the crack initiation and propagation behavior.
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页码：6251 / 6257
页数：6
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