Tensile mechanical properties and fracture behaviors of nickel-based superalloy 718 in the presence of hydrogen

Li, Xinfeng; Zhang, Jin; Fu, Qinqin; Akiyama, Eiji; Song, Xiaolong; Wang, Yanfei; Li, Qizhen; Zou, Ning

doi:10.1016/j.ijhydene.2018.08.179

Tensile mechanical properties and fracture behaviors of nickel-based superalloy 718 in the presence of hydrogen

Journal Article · Wed Oct 03 00:00:00 EDT 2018 · International Journal of Hydrogen Energy

DOI:https://doi.org/10.1016/j.ijhydene.2018.08.179· OSTI ID:1612481

Li, Xinfeng ^[1]; Zhang, Jin ^[2]; Fu, Qinqin ^[3]; ^[4]; Song, Xiaolong ^[4]; Wang, Yanfei ^[5]; Li, Qizhen ^[2]; Zou, Ning ^[2]

Washington State Univ., Pullman, WA (United States); DOE/OSTI
Washington State Univ., Pullman, WA (United States)
Xi'an Jiaotong Univ., Shaanxi (China)
Tohoku Univ., Sendai (Japan)
China Univ. of Mining and Technology, Xuzhou, Jiangsu (China)

Hydrogen embrittlement of a nickel-based superalloy IN718 was investigated using slow strain rate tensile tests. Post-mortem observation of fractured samples was performed to explore hydrogen-assisted failure mechanisms of the alloy. The results reveal that hydrogen charging reduces yield strength, tensile strength, fracture strain and work hardening rate. With increasing current density, yield strength and tensile strength reduce linearly and fracture strain decreases exponentially. Furthermore, the crack initiation and propagation in hydrogen-charged region depends on the distribution of δ phase in the alloy. For needle-shaped δ phase within the grains, the nucleation of voids takes place at the intersections between dislocation slip bands and δ phase due to the hydrogen-enhanced localized plasticity (HELP)-assisted shear localization and possible hydrogen agglomeration. For δ phase along the grain boundaries, the impingement of slip bands and local hydrogen accumulation at γ-matrix/δ phase interfaces as well as hydrogen-enhanced decohesion (HEDE)-assisted decohesion lead to the void nucleation at the interfaces. Because of the decoration of δ phase at the grain boundaries, hydrogen-assisted cracking preferentially propagates along the grain boundaries. It is therefore suggested that the synergistic interplay of HELP mechanism and HEDE mechanism can be used to explain the embrittlement of the alloy.

View Accepted Manuscript (DOE)

Research Organization:: Washington State University, Pullman, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0016333

OSTI ID:: 1612481

Alternate ID(s):: OSTI ID: 1642284

Journal Information:: International Journal of Hydrogen Energy, Journal Name: International Journal of Hydrogen Energy Journal Issue: 43 Vol. 43; ISSN 0360-3199

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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