Effect of Intercritical Annealing Time on Microstructure Evolution and Mechanical Properties of Low Carbon Medium Manganese Steel Subjected to Multi-Step Heat Treatment Process
A novel multi-step heat treatment process was performed for 0.2C–5Mn steel, and the effect of intercritical annealing (IA) durations on the microstructure evolution and mechanical properties was studied. The results showed that the content of primary reversed austenite (PRA) hardly changed as the IA...
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MDPI AG
2022-03-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/7/2425 |
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| author | Feilong Wang Xiaoyu Ye Shoubin Ren Kaihua Zhang Xiaokai Liang Gang Liu |
| author_facet | Feilong Wang Xiaoyu Ye Shoubin Ren Kaihua Zhang Xiaokai Liang Gang Liu |
| author_sort | Feilong Wang |
| collection | DOAJ |
| description | A novel multi-step heat treatment process was performed for 0.2C–5Mn steel, and the effect of intercritical annealing (IA) durations on the microstructure evolution and mechanical properties was studied. The results showed that the content of primary reversed austenite (PRA) hardly changed as the IA time increased from 6 h to 50 h, but only less than 10% of PRA remained after being tempered at 200 °C due to the appearance of secondary martensite (SM). The final microstructure contained SM, the primary martensite (PM), and RA, which was protected by the SM so that the transformation-induced plasticity (TRIP) effect was unlikely to occur. Meanwhile, the (Ti, V, Mo)C particle sizes were 14.27, 14.68 and 15.65 nm for the intermediate processes of IA-6 h, IA-12 h, and IA-50 h, respectively. As the IA time increased from 6 h to 50 h, both the dislocation and precipitation strengthening increment decreased. As a result, the best mechanical properties were obtained from the intermediate process of IA-12 h, with a yield strength of 1115.5 MPa, tensile strength of 1573.5 MPa, and −20 °C impact energy of 30.4 J. |
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| id | doaj.art-7ea50db88e354aae8cb52228822e16b3 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:41:34Z |
| publishDate | 2022-03-01 |
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| spelling | doaj.art-7ea50db88e354aae8cb52228822e16b32023-11-30T23:31:59ZengMDPI AGMaterials1996-19442022-03-01157242510.3390/ma15072425Effect of Intercritical Annealing Time on Microstructure Evolution and Mechanical Properties of Low Carbon Medium Manganese Steel Subjected to Multi-Step Heat Treatment ProcessFeilong Wang0Xiaoyu Ye1Shoubin Ren2Kaihua Zhang3Xiaokai Liang4Gang Liu5State Key Laboratory of New Metal Materials, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, ChinaXichang Steel & Vanadium Co., Ltd. Pangang Group, Xichang 615000, ChinaState Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, ChinaDepartment of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, ChinaDepartment of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, ChinaA novel multi-step heat treatment process was performed for 0.2C–5Mn steel, and the effect of intercritical annealing (IA) durations on the microstructure evolution and mechanical properties was studied. The results showed that the content of primary reversed austenite (PRA) hardly changed as the IA time increased from 6 h to 50 h, but only less than 10% of PRA remained after being tempered at 200 °C due to the appearance of secondary martensite (SM). The final microstructure contained SM, the primary martensite (PM), and RA, which was protected by the SM so that the transformation-induced plasticity (TRIP) effect was unlikely to occur. Meanwhile, the (Ti, V, Mo)C particle sizes were 14.27, 14.68 and 15.65 nm for the intermediate processes of IA-6 h, IA-12 h, and IA-50 h, respectively. As the IA time increased from 6 h to 50 h, both the dislocation and precipitation strengthening increment decreased. As a result, the best mechanical properties were obtained from the intermediate process of IA-12 h, with a yield strength of 1115.5 MPa, tensile strength of 1573.5 MPa, and −20 °C impact energy of 30.4 J.https://www.mdpi.com/1996-1944/15/7/2425multi-step heat treatment processintercritical annealing timereversed austenitemicrostructuremechanical propertiesmedium manganese steel |
| spellingShingle | Feilong Wang Xiaoyu Ye Shoubin Ren Kaihua Zhang Xiaokai Liang Gang Liu Effect of Intercritical Annealing Time on Microstructure Evolution and Mechanical Properties of Low Carbon Medium Manganese Steel Subjected to Multi-Step Heat Treatment Process Materials multi-step heat treatment process intercritical annealing time reversed austenite microstructure mechanical properties medium manganese steel |
| title | Effect of Intercritical Annealing Time on Microstructure Evolution and Mechanical Properties of Low Carbon Medium Manganese Steel Subjected to Multi-Step Heat Treatment Process |
| title_full | Effect of Intercritical Annealing Time on Microstructure Evolution and Mechanical Properties of Low Carbon Medium Manganese Steel Subjected to Multi-Step Heat Treatment Process |
| title_fullStr | Effect of Intercritical Annealing Time on Microstructure Evolution and Mechanical Properties of Low Carbon Medium Manganese Steel Subjected to Multi-Step Heat Treatment Process |
| title_full_unstemmed | Effect of Intercritical Annealing Time on Microstructure Evolution and Mechanical Properties of Low Carbon Medium Manganese Steel Subjected to Multi-Step Heat Treatment Process |
| title_short | Effect of Intercritical Annealing Time on Microstructure Evolution and Mechanical Properties of Low Carbon Medium Manganese Steel Subjected to Multi-Step Heat Treatment Process |
| title_sort | effect of intercritical annealing time on microstructure evolution and mechanical properties of low carbon medium manganese steel subjected to multi step heat treatment process |
| topic | multi-step heat treatment process intercritical annealing time reversed austenite microstructure mechanical properties medium manganese steel |
| url | https://www.mdpi.com/1996-1944/15/7/2425 |
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