Impact Factor:3.3
DOI number:10.1007/s12540-023-01546-z
Affiliation of Author(s):南京工程学院
Teaching and Research Group:0
Journal:Metals and Materials International
Place of Publication:韩国
Funded by:江苏省自然科学基金，2020年“双创计划”特别人才引进江苏省先进结构材料与应用技术重点实验室开放项目，南京工程学院人才引进研究基金
Key Words:Hydrogen embrittlement · Wire arc additive manufacturing · Ni-based superalloy · Laves · Crack propagation
Abstract:The infuence of hydrogen on the mechanical response of Ni-based superalloy Inconel 625 fabricated by wire arc additive manufacturing (WAAM) was investigated via slow strain rate tensile tests at room temperature. The results indicate that the WAAM superalloy just sufered from a slight necking deformation but still reached a high strain value in the presence of hydrogen. H promotes the fracture of the WAAM superalloy from ductile microvoid coalescence change to brittle quasicleavage. The γ-matrix/Laves phase interfaces served as the preferred cracking sites in the alloy. However, the initiation of voids at the interface was not hydrogen-induced, which may be attributed to the strong hydrogen capture ability of the Laves phase, resulting in less hydrogen segregated to the interface. In the formation of voids in the interface at high stress, hydrogen accumulates at the interface through dislocation transport and stress-induced, weakening the interface binding force by hydrogen enrichment. Hydrogen enrichment at the crack tip diminished the stress feld and thus reduced the energy required for crack cracking during cracking propagation.
Note:0
Indexed by:研究论文
Discipline:Engineering
Volume:30
Page Number:872-885
ISSN No.:2005-4149
Translation or Not:no
Date of Publication:2024-01-01