期刊
SCRIPTA MATERIALIA
卷 168, 期 -, 页码 124-128出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.05.002
关键词
Low cycle fatigue (LCF); Single crystal superalloy; Selective electron beam melting (SEBM); Hot isostatic pressing (HIP); Microstructure
类别
资金
- Deutsche Forschungsgemeinschaft (DFG) [SFB/TR 103]
The high temperature low cycle fatigue behavior of specimens manufactured from a single crystalline nickel base superalloy processed by selective electron beam melting (SEBM) has been investigated with respect to the effect of different heat treatments. The fatigue lifetime of heat treated material was significantly higher than that of as built material. Applying hot isostatic pressing (HIP) with an integrated heat treatment resulted in even longer fatigue life. Lifetime limiting crack initiation occurred at interfaces of melting layers, at micro-porosity generated during solidification or, in HIP treated samples, at precipitates which formed at the location of collapsed pores. (C) 2019 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
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