Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel
As the need for duplex stainless steel (DSS) increases, it is necessary to evaluate hydrogen stress cracking (HSC) in dissimilar welded joints (WJs) of DSS and carbon steel. This study aims to investigate the effect of the weld microstructure on the HSC behaviour of dissimilar gas-tungsten arc welds...
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MDPI AG
2021-06-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/7/1039 |
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| author | Hanji Park Byungrok Moon Younghoon Moon Namhyun Kang |
| author_facet | Hanji Park Byungrok Moon Younghoon Moon Namhyun Kang |
| author_sort | Hanji Park |
| collection | DOAJ |
| description | As the need for duplex stainless steel (DSS) increases, it is necessary to evaluate hydrogen stress cracking (HSC) in dissimilar welded joints (WJs) of DSS and carbon steel. This study aims to investigate the effect of the weld microstructure on the HSC behaviour of dissimilar gas-tungsten arc welds of DSS and carbon steel. In situ slow-strain rate testing (SSRT) with hydrogen charging was conducted for transverse WJs, which fractured in the softened heat-affected zone of the carbon steel under hydrogen-free conditions. However, HSC occurred at the martensite band and the interface of the austenite and martensite bands in the type-II boundary. The band acted as an HSC initiation site because of the presence of a large amount of trapped hydrogen and a high strain concentration during the SSRT with hydrogen charging. Even though some weld microstructures such as the austenite and martensite bands in type-II boundaries were harmless under normal hydrogen-free conditions, they had a negative effect in a hydrogen atmosphere, resulting in the premature rupture of the weld. Eventually, a premature fracture occurred during the in situ SSRT in the type-II boundary because of the hydrogen-enhanced strain-induced void (HESIV) and hydrogen-enhanced localised plasticity (HELP) mechanisms. |
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| id | doaj.art-9953d56d4137479a9bf792d9cc9fe0e9 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T09:57:57Z |
| publishDate | 2021-06-01 |
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| spelling | doaj.art-9953d56d4137479a9bf792d9cc9fe0e92023-11-22T02:10:51ZengMDPI AGMetals2075-47012021-06-01117103910.3390/met11071039Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon SteelHanji Park0Byungrok Moon1Younghoon Moon2Namhyun Kang3Department of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaDepartment of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaSchool of Mechanical Engineering, Pusan National University, Busan 46241, KoreaDepartment of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaAs the need for duplex stainless steel (DSS) increases, it is necessary to evaluate hydrogen stress cracking (HSC) in dissimilar welded joints (WJs) of DSS and carbon steel. This study aims to investigate the effect of the weld microstructure on the HSC behaviour of dissimilar gas-tungsten arc welds of DSS and carbon steel. In situ slow-strain rate testing (SSRT) with hydrogen charging was conducted for transverse WJs, which fractured in the softened heat-affected zone of the carbon steel under hydrogen-free conditions. However, HSC occurred at the martensite band and the interface of the austenite and martensite bands in the type-II boundary. The band acted as an HSC initiation site because of the presence of a large amount of trapped hydrogen and a high strain concentration during the SSRT with hydrogen charging. Even though some weld microstructures such as the austenite and martensite bands in type-II boundaries were harmless under normal hydrogen-free conditions, they had a negative effect in a hydrogen atmosphere, resulting in the premature rupture of the weld. Eventually, a premature fracture occurred during the in situ SSRT in the type-II boundary because of the hydrogen-enhanced strain-induced void (HESIV) and hydrogen-enhanced localised plasticity (HELP) mechanisms.https://www.mdpi.com/2075-4701/11/7/1039duplex stainless steelcarbon steeldissimilar welded jointtype-II boundaryhydrogen stress crackingslow strain rate testing (SSRT) |
| spellingShingle | Hanji Park Byungrok Moon Younghoon Moon Namhyun Kang Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel Metals duplex stainless steel carbon steel dissimilar welded joint type-II boundary hydrogen stress cracking slow strain rate testing (SSRT) |
| title | Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel |
| title_full | Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel |
| title_fullStr | Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel |
| title_full_unstemmed | Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel |
| title_short | Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel |
| title_sort | hydrogen stress cracking behaviour in dissimilar welded joints of duplex stainless steel and carbon steel |
| topic | duplex stainless steel carbon steel dissimilar welded joint type-II boundary hydrogen stress cracking slow strain rate testing (SSRT) |
| url | https://www.mdpi.com/2075-4701/11/7/1039 |
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