Low-Cycle Fatigue Properties of Nickel-Based Superalloys Processed by High-Gradient Directional Solidification

被引：0
|
作者：
Z.D.Fan
D.Wang
C.Liu
G.Zhang
J.Shen
L.H.Lou
J.Zhang
机构：
[1] Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences
[2] Xi’an Thermal Power Research Institute Co., Ltd.
[3] Shenyang National Laboratory for Materials Science,Institute of Metal Research, Chinese Academy of Sciences
来源：
Acta Metallurgica Sinica(English Letters) | 2017年 / 30卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Superalloys; Rapid solidification; Low-cycle fatigue; Microstructure;
D O I：
暂无
中图分类号：
TG132.3 [特种热性质合金];
学科分类号：
080502 ;
摘要：
The low-cycle fatigue(LCF) properties of DD10(single-crystal) and DZ53(columnar-grained) superalloys solidified by liquid–metal cooling(LMC) and high-rate solidification(HRS) processes have been systematically investigated. It was found that the LCF life of DZ53 solidified by LMC was obviously better than that solidified by HRS. In contrast, for DD10, LMC showed no remarkable influences on LCF properties at high temperature and only improved LCF properties at intermediate temperature. Microstructure examination showed that the cracks generally initiated at micropores in the subsurface at intermediate temperature. However, the cracks occurred on the surface due to oxidation, or persistent slip bands near script-MC at high temperature. Therefore, the benefits of LMC technique can be attributed to both of the reduced casting defects which significantly affect the LCF properties at intermediate temperature and the improved microstructural homogeneity which was strongly correlated to the LCF properties of alloys at high temperature.
引用
收藏
页码：878 / 886
页数：9
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