Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments
This study examined the effects of alloying elements (C, Mo) on hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) behaviors of A516-65 grade pressure vessel steel in sour environments. A range of experimental and analytical methods of HIC, SSC, electrochemical permeation, and immersi...
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| Format: | Article |
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MDPI AG
2020-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/18/4188 |
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| author | Jin Sung Park Jin Woo Lee Joong Ki Hwang Sung Jin Kim |
| author_facet | Jin Sung Park Jin Woo Lee Joong Ki Hwang Sung Jin Kim |
| author_sort | Jin Sung Park |
| collection | DOAJ |
| description | This study examined the effects of alloying elements (C, Mo) on hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) behaviors of A516-65 grade pressure vessel steel in sour environments. A range of experimental and analytical methods of HIC, SSC, electrochemical permeation, and immersion experiments were used. The steel with a higher C content had a larger fraction of banded pearlite, which acted as a reversible trap for hydrogen, and slower diffusion kinetics of hydrogen was obtained. In addition, a higher hardness in the mid-thickness regions of the steel, due to center segregation, resulted in easier HIC propagation. On the other hand, the steel with a higher Mo content showed more dispersed banded pearlite and a larger amount of irreversibly trapped hydrogen. Nevertheless, the addition of Mo to the steel can deteriorate the surface properties through localized pitting and the local detachment of corrosion products with uneven interfaces, increasing the vulnerability to SSC. The mechanistic reasons for the results are discussed, and a desirable alloy design for ensuring an enhanced resistance to hydrogen assisted cracking (HAC) is proposed. |
| first_indexed | 2024-03-10T16:10:46Z |
| format | Article |
| id | doaj.art-841ece3930424316bc0f7f263c97097c |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T16:10:46Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-841ece3930424316bc0f7f263c97097c2023-11-20T14:29:42ZengMDPI AGMaterials1996-19442020-09-011318418810.3390/ma13184188Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour EnvironmentsJin Sung Park0Jin Woo Lee1Joong Ki Hwang2Sung Jin Kim3Department of Advanced Materials Engineering, Sunchon National University, Jungang-ro, Suncheon, Jeonnam 57922, KoreaPOSCO Steel Solution Center, Pohang, Gyungbuk 790-704, KoreaDepartment of Mechanical Engineering, Tongmyong University, Busan 48520, KoreaDepartment of Advanced Materials Engineering, Sunchon National University, Jungang-ro, Suncheon, Jeonnam 57922, KoreaThis study examined the effects of alloying elements (C, Mo) on hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) behaviors of A516-65 grade pressure vessel steel in sour environments. A range of experimental and analytical methods of HIC, SSC, electrochemical permeation, and immersion experiments were used. The steel with a higher C content had a larger fraction of banded pearlite, which acted as a reversible trap for hydrogen, and slower diffusion kinetics of hydrogen was obtained. In addition, a higher hardness in the mid-thickness regions of the steel, due to center segregation, resulted in easier HIC propagation. On the other hand, the steel with a higher Mo content showed more dispersed banded pearlite and a larger amount of irreversibly trapped hydrogen. Nevertheless, the addition of Mo to the steel can deteriorate the surface properties through localized pitting and the local detachment of corrosion products with uneven interfaces, increasing the vulnerability to SSC. The mechanistic reasons for the results are discussed, and a desirable alloy design for ensuring an enhanced resistance to hydrogen assisted cracking (HAC) is proposed.https://www.mdpi.com/1996-1944/13/18/4188steelhydrogen induced crackingsulfide stress crackingsourhydrogen permeationdiffusion |
| spellingShingle | Jin Sung Park Jin Woo Lee Joong Ki Hwang Sung Jin Kim Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments Materials steel hydrogen induced cracking sulfide stress cracking sour hydrogen permeation diffusion |
| title | Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments |
| title_full | Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments |
| title_fullStr | Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments |
| title_full_unstemmed | Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments |
| title_short | Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments |
| title_sort | effects of alloying elements c mo on hydrogen assisted cracking behaviors of a516 65 steels in sour environments |
| topic | steel hydrogen induced cracking sulfide stress cracking sour hydrogen permeation diffusion |
| url | https://www.mdpi.com/1996-1944/13/18/4188 |
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