Tensile and fracture behaviors of austenitic high-manganese steels subject to different hydrogen embrittlement test methods

The hydrogen-embrittlement susceptibility of austenitic high-manganese steels according to different hydrogen-charging test methods was discussed in terms of hydrogen-embrittlement process and fracture mechanism. Ex-situ electrochemical and high-pressure thermal hydrogen-charging methods exhibited a...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-10, Vol.766, p.138367, Article 138367
Main Authors: Lee, Sang-In, Lee, Ji-Min, Lee, Seung-Yong, Kim, Han-Jin, Suh, Jin-Yoo, Shim, Jae-Hyeok, Baek, Un-Bong, Nahm, Seung-Hoon, Lee, Joonho, Hwang, Byoungchul
Format: Article
Language:English
Subjects:
Austenitic
Austenitic stainless steels
Axial stress
Fracture
Fracture mechanics
High-manganese steel
Hydrogen
Hydrogen charging
Hydrogen embrittlement
Intergranular fracture
Manganese steels
Plastic instability
Test methods
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Summary:The hydrogen-embrittlement susceptibility of austenitic high-manganese steels according to different hydrogen-charging test methods was discussed in terms of hydrogen-embrittlement process and fracture mechanism. Ex-situ electrochemical and high-pressure thermal hydrogen-charging methods exhibited a difference in hydrogen-embrittlement susceptibility because they affect the permeability and diffusivity of hydrogen. Moreover, the in-situ high-pressure gaseous hydrogen-charging method showed the most apparent hydrogen-embrittlement susceptibility because higher triaxial stress in the necked region caused by plastic instability accelerates hydrogen charging in the specimen during tensile testing in hydrogen environment, thus leading to intergranular fracture in all regions. •Hydrogen-embrittlement susceptibility can be differently estimated according to the hydrogen-charging method used.•Ex-situ electrochemical and high-pressure thermal hydrogen-charging methods exhibit different hydrogen-embrittlement usceptibility .•In-situ high-pressure gaseous hydrogen-charging method show the most apparent hydrogen-embrittlement susceptibility.•Hydrogen-charging method is one of the most important factors affecting the hydrogen-embrittlement susceptibility.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2019.138367