In-situ observation of hydrogen induced crack initiation in a nickel-based superalloy

SCRIPTA MATERIALIA

卷:140

Article

Zhang, Zhenbo¹  Obasi, Gideon¹  Morana, Roberto²  Preuss, Michael¹ 

[1] Univ Manchester, Sch Mat, BP Int Ctr Adv Mat, Manchester M13 9PL, Lancs, England

[2] BP Explorat Operating Co Ltd, Chertsey Rd, Sunbury On Thames TW16 7LN, Middx, England

关键词: Nickel-based superalloy;    Hydrogen embrittlement;    Crack initiation;    In-situ loading;    Dislocation slip band;   

DOI  :  10.1016/j.scriptamat.2017.07.006

来源: Elsevier

【 摘 要 】

Hydrogen induced crack initiation in a nickel-based superalloy was studied via in-situ Scanning Electron Microscopy observation under slow strain rate loading. Direct evidence has been obtained of crack initiation and propagation along dislocation slip bands leading to sample fracture. Post-mortem microstructural analysis showed that hydrogen induced cracking and separation along dislocation slip bands, which are along {111}gamma crystallographic planes with the highest Schmid factor, leads to the formation of the typical slip-trace-like features on the quasi-cleavage surface. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd.

【 授权许可】

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