Microstructure evolution and strengthening mechanism of air-hardening steel subjected to the austenitizing annealing treatment
The microstructure evolution and mechanical properties of air-hardening steel subjected to different austenitizing annealing treatments were investigated in this study and, especially, the precipitation behavior of the steel was analyzed, as well as the strengthening mechanism of the steel was eluci...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/acfd88 |
| _version_ | 1827798684983623680 |
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| author | Yonggang Yang Xiang Luo Minggang Lei Xing Fang Shouhua Li Yanxin Wu Zhenli Mi |
| author_facet | Yonggang Yang Xiang Luo Minggang Lei Xing Fang Shouhua Li Yanxin Wu Zhenli Mi |
| author_sort | Yonggang Yang |
| collection | DOAJ |
| description | The microstructure evolution and mechanical properties of air-hardening steel subjected to different austenitizing annealing treatments were investigated in this study and, especially, the precipitation behavior of the steel was analyzed, as well as the strengthening mechanism of the steel was elucidated on the basis of systematic microstructural characterization. Results reveal that a ferrite + martensite dual-phase structure with about 700 MPa tensile strength and 20% elongation can be obtained by austenitizing the experimental steel in the range of 750∼800 °C; while austenitizing between 850 °C and 950 °C results in granular bainite + lath bainite with about 950 MPa tensile strength and 12% elongation. The experimental steel has the highest strength after austenitizing at 900 °C with lots of nano-scale (Ti, Mo, V)C particles distributed in its matrix. Quantitative calculation results illustrate that the main strengthening factors are grain refinement strengthening, dislocation strengthening and precipitation strengthening. In addition, due to the potential interaction effect between different strengthening factors, a modified strengthening model is proposed to describe the strengthening behavior of the air-hardening steel when it is heat-treated in the two-phase region. |
| first_indexed | 2024-03-11T19:40:11Z |
| format | Article |
| id | doaj.art-09d0f37d3d0142d68fe2203a7f14e820 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-11T19:40:11Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-09d0f37d3d0142d68fe2203a7f14e8202023-10-06T11:35:09ZengIOP PublishingMaterials Research Express2053-15912023-01-01101010650210.1088/2053-1591/acfd88Microstructure evolution and strengthening mechanism of air-hardening steel subjected to the austenitizing annealing treatmentYonggang Yang0Xiang Luo1Minggang Lei2Xing Fang3https://orcid.org/0000-0003-2215-2016Shouhua Li4Yanxin Wu5Zhenli Mi6https://orcid.org/0000-0002-1456-8858National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing, University of Science and Technology Beijing , Beijing 100083, People’s Republic of ChinaXinyu Iron & Steel Group Co., Ltd, Jiangxi 338001, People’s Republic of ChinaHandan Iron and Steel Group Co., Ltd, Hebei 056015, People’s Republic of ChinaNational Engineering Research Center for Advanced Rolling and Intelligent Manufacturing, University of Science and Technology Beijing , Beijing 100083, People’s Republic of ChinaHandan Iron and Steel Group Co., Ltd, Hebei 056015, People’s Republic of ChinaNational Engineering Research Center for Advanced Rolling and Intelligent Manufacturing, University of Science and Technology Beijing , Beijing 100083, People’s Republic of ChinaNational Engineering Research Center for Advanced Rolling and Intelligent Manufacturing, University of Science and Technology Beijing , Beijing 100083, People’s Republic of ChinaThe microstructure evolution and mechanical properties of air-hardening steel subjected to different austenitizing annealing treatments were investigated in this study and, especially, the precipitation behavior of the steel was analyzed, as well as the strengthening mechanism of the steel was elucidated on the basis of systematic microstructural characterization. Results reveal that a ferrite + martensite dual-phase structure with about 700 MPa tensile strength and 20% elongation can be obtained by austenitizing the experimental steel in the range of 750∼800 °C; while austenitizing between 850 °C and 950 °C results in granular bainite + lath bainite with about 950 MPa tensile strength and 12% elongation. The experimental steel has the highest strength after austenitizing at 900 °C with lots of nano-scale (Ti, Mo, V)C particles distributed in its matrix. Quantitative calculation results illustrate that the main strengthening factors are grain refinement strengthening, dislocation strengthening and precipitation strengthening. In addition, due to the potential interaction effect between different strengthening factors, a modified strengthening model is proposed to describe the strengthening behavior of the air-hardening steel when it is heat-treated in the two-phase region.https://doi.org/10.1088/2053-1591/acfd88air-hardening steelmicrostructurestrengthening mechanismaustenitizing annealingmechanical properties |
| spellingShingle | Yonggang Yang Xiang Luo Minggang Lei Xing Fang Shouhua Li Yanxin Wu Zhenli Mi Microstructure evolution and strengthening mechanism of air-hardening steel subjected to the austenitizing annealing treatment Materials Research Express air-hardening steel microstructure strengthening mechanism austenitizing annealing mechanical properties |
| title | Microstructure evolution and strengthening mechanism of air-hardening steel subjected to the austenitizing annealing treatment |
| title_full | Microstructure evolution and strengthening mechanism of air-hardening steel subjected to the austenitizing annealing treatment |
| title_fullStr | Microstructure evolution and strengthening mechanism of air-hardening steel subjected to the austenitizing annealing treatment |
| title_full_unstemmed | Microstructure evolution and strengthening mechanism of air-hardening steel subjected to the austenitizing annealing treatment |
| title_short | Microstructure evolution and strengthening mechanism of air-hardening steel subjected to the austenitizing annealing treatment |
| title_sort | microstructure evolution and strengthening mechanism of air hardening steel subjected to the austenitizing annealing treatment |
| topic | air-hardening steel microstructure strengthening mechanism austenitizing annealing mechanical properties |
| url | https://doi.org/10.1088/2053-1591/acfd88 |
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