Investigation of Hydrogen Embrittlement of Haynes 617 and Hastelloy X Alloys Using Electrochemical Hydrogen Charging

• Autorzy: Kim Jae-Yun , Kim Sang-Gyu , Hwang Byoungchul

Identyfikatory

DOI

10.24425/amm.2024.147802

• Języki publikacji: EN

Abstrakty

EN

This study explores the hydrogen embrittlement behaviour of two Ni-based superalloys using electrochemical hydrogen charging. Two types of tensile specimens with different geometry for the Haynes 617 and Hastelloy X alloys were electrochemically hydrogen-charged, and then a slow strain rate test was conducted to investigate the hydrogen embrittlement behaviour. Unlike the ASTM standard specimens, two-step dog-bone specimens with a higher surface-area-to-volume ratio showed higher sensitivity to hydrogen embrittlement because hydrogen atoms are distributed mostly on the surface area. On the other hand, the Haynes 617 alloy had a lower hydrogen embrittlement resistance than that of the Hastelloy X alloy due to its relatively large grain size and the presence of precipitates at grain boundaries. The Haynes 617 alloy primarily showed an intergranular fracture mode with cracks from the slip band, whereas the Hastelloy X alloy exhibited a combination of transgranular and intergranular fracture behavior under hydrogen-charged conditions.

Słowa kluczowe

EN

Ni-based superalloy; hydrogen embrittlement; specimen geometry; electrochemical hydrogen charging; slow strain rate tests; SSRT

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2024
• Tom: Vol. 69, iss. 1
• Strony: 141--144
• Opis fizyczny: Bibliogr. 28 poz., fot., rys., tab.

Twórcy

autor

Kim Jae-Yun

• Seoul National University of Science and Technology, Department of Materials Science and Engineering, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea

• https://orcid.org/0009-0001-4455-4078

autor

Kim Sang-Gyu

• Seoul National University of Science and Technology, Department of Materials Science and Engineering, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea

• https://orcid.org/0000-0003-2237-8517

autor

Hwang Byoungchul

• Seoul National University of Science and Technology, Department of Materials Science and Engineering, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea

• https://orcid.org/0000-0001-6330-4747

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Uwagi

This research was supported by Korea Electric Power Corporation. (Grant number: R21XO02-6) and by the Basic Science Research Program through the National Research Foundation of Korea (NRF-2022R1A2C2004834).