Optimizing the Strength and Toughness of V/Mo-Modified 0.22C–5.24Mn Steel by Short-Time Partial Austenitization Process
In order to obtain the good match between yield strength and low-temperature toughness, the short-time partial austenitization (SPA) process was employed for V/Mo-bearing 0.22C–5.24Mn steel. The initial microstructure after intercritical tempering was dual-phase ferrite and reversed austenite (RA),...
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2024-01-01
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| author | Haoqing Zheng Gang Liu Shuai Tong Guanqiao Su Xiaokai Liang Xinjun Sun |
| author_facet | Haoqing Zheng Gang Liu Shuai Tong Guanqiao Su Xiaokai Liang Xinjun Sun |
| author_sort | Haoqing Zheng |
| collection | DOAJ |
| description | In order to obtain the good match between yield strength and low-temperature toughness, the short-time partial austenitization (SPA) process was employed for V/Mo-bearing 0.22C–5.24Mn steel. The initial microstructure after intercritical tempering was dual-phase ferrite and reversed austenite (RA), while the final microstructure consisted of ferrite, RA, and secondary martensite (SM) after being subjected to the SPA process. (V, Mo)C with disclike morphology mainly precipitated during intercritical tempering, and the aspect ratio of particles decreased, leading to the appearance of near-spherical morphology. After being subjected to SPA process, the resultant multiphase hierarchical microstructure (three layers: outer layer of ferrite, interlayer of SM, and inner layer of RA) enabled a high yield strength of 1097 MPa, a total elongation of 14%, and an impressive impact energy of 33.3 J at −20 °C. The strengthening contribution of (V, Mo)C precipitation was estimated to be about 108 MPa. |
| first_indexed | 2024-03-08T03:52:52Z |
| format | Article |
| id | doaj.art-8ad5065f0a5242e9a8b3f5c008a0a334 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T03:52:52Z |
| publishDate | 2024-01-01 |
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| series | Materials |
| spelling | doaj.art-8ad5065f0a5242e9a8b3f5c008a0a3342024-02-09T15:17:43ZengMDPI AGMaterials1996-19442024-01-0117368710.3390/ma17030687Optimizing the Strength and Toughness of V/Mo-Modified 0.22C–5.24Mn Steel by Short-Time Partial Austenitization ProcessHaoqing Zheng0Gang Liu1Shuai Tong2Guanqiao Su3Xiaokai Liang4Xinjun Sun5State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group, Panzhihua 617000, ChinaDepartment of Structural Steels, Central Iron and Steel Research Institute Company Limited, Beijing 100081, ChinaDepartment of Structural Steels, Central Iron and Steel Research Institute Company Limited, Beijing 100081, ChinaState Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group, Panzhihua 617000, ChinaDepartment of Structural Steels, Central Iron and Steel Research Institute Company Limited, Beijing 100081, ChinaDepartment of Structural Steels, Central Iron and Steel Research Institute Company Limited, Beijing 100081, ChinaIn order to obtain the good match between yield strength and low-temperature toughness, the short-time partial austenitization (SPA) process was employed for V/Mo-bearing 0.22C–5.24Mn steel. The initial microstructure after intercritical tempering was dual-phase ferrite and reversed austenite (RA), while the final microstructure consisted of ferrite, RA, and secondary martensite (SM) after being subjected to the SPA process. (V, Mo)C with disclike morphology mainly precipitated during intercritical tempering, and the aspect ratio of particles decreased, leading to the appearance of near-spherical morphology. After being subjected to SPA process, the resultant multiphase hierarchical microstructure (three layers: outer layer of ferrite, interlayer of SM, and inner layer of RA) enabled a high yield strength of 1097 MPa, a total elongation of 14%, and an impressive impact energy of 33.3 J at −20 °C. The strengthening contribution of (V, Mo)C precipitation was estimated to be about 108 MPa.https://www.mdpi.com/1996-1944/17/3/687medium manganese steelshort-time partial austenitizationstrength and toughnessmultiphase hierarchical microstructure(V, Mo)C precipitation |
| spellingShingle | Haoqing Zheng Gang Liu Shuai Tong Guanqiao Su Xiaokai Liang Xinjun Sun Optimizing the Strength and Toughness of V/Mo-Modified 0.22C–5.24Mn Steel by Short-Time Partial Austenitization Process Materials medium manganese steel short-time partial austenitization strength and toughness multiphase hierarchical microstructure (V, Mo)C precipitation |
| title | Optimizing the Strength and Toughness of V/Mo-Modified 0.22C–5.24Mn Steel by Short-Time Partial Austenitization Process |
| title_full | Optimizing the Strength and Toughness of V/Mo-Modified 0.22C–5.24Mn Steel by Short-Time Partial Austenitization Process |
| title_fullStr | Optimizing the Strength and Toughness of V/Mo-Modified 0.22C–5.24Mn Steel by Short-Time Partial Austenitization Process |
| title_full_unstemmed | Optimizing the Strength and Toughness of V/Mo-Modified 0.22C–5.24Mn Steel by Short-Time Partial Austenitization Process |
| title_short | Optimizing the Strength and Toughness of V/Mo-Modified 0.22C–5.24Mn Steel by Short-Time Partial Austenitization Process |
| title_sort | optimizing the strength and toughness of v mo modified 0 22c 5 24mn steel by short time partial austenitization process |
| topic | medium manganese steel short-time partial austenitization strength and toughness multiphase hierarchical microstructure (V, Mo)C precipitation |
| url | https://www.mdpi.com/1996-1944/17/3/687 |
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