Competitive cracking behavior and microscopic mechanism of Ni-based superalloy blade respecting accelerated CCF failure

•Discover competitive cracking behavior in accelerated CCF failure for turbine blades.•Find crack initiation change from slip planes to metallic pores and carbides, to oxides.•Reveal damage mechanisms in acceleration states by microstructural dominant features.•The source of cracking transition from...

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Bibliographic Details
Published in:International journal of fatigue 2021-09, Vol.150, p.106306, Article 106306
Main Authors: Han, Lei, Wang, Yibing, Zhang, Yu, Lu, Cheng, Fei, Chengwei, Zhao, Yongjun
Format: Article
Language:English
Subjects:
Combined high and low cycle fatigue
Crack initiation
Crack mode
Damage mechanism
Fatigue cracking
Fracture mechanics
Grain boundaries
High cycle fatigue
Low cycle fatigue
Materials fatigue
Microstructural feature
Nickel base alloys
Slip planes
Superalloys
Turbine blade
Turbine blades
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Summary:•Discover competitive cracking behavior in accelerated CCF failure for turbine blades.•Find crack initiation change from slip planes to metallic pores and carbides, to oxides.•Reveal damage mechanisms in acceleration states by microstructural dominant features.•The source of cracking transition from transgranular to intergranular mode is the detected behavior.•Provide a promising mechanism insight for CCF estimation and acceleration test. The cracking behavior and microscopic mechanism of K403 superalloy turbine blade are investigated respecting the Combined high and low Cycle Fatigue (CCF) with four acceleration states. It concludes that: (1) the crack initiation sites transform from slip planes inside alloy matrix to subsurface pores and carbides, then to oxides outside surface with increasing loads; (2) the behavior in (1) is attributed to the competition and alliance of different microstructural factors and the interaction of the factors with grain boundaries; (3) hereinto, the role shift of high cycle fatigue in CCF causes the transformation of transgranular to intergranular cracking mode.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2021.106306