Inter-Critically Reheated CGHAZ of Ultra-High-Strength Martensitic Steel with Different Cooling Rates
The mechanical properties of steel’s inter-critically reheated coarse-grained heat-affected zone (ICR CGHAZ) directly affects the service life of machinery equipment. The hardness and toughness of ICR CGHAZ can be optimized simultaneously through tailoring microstructure where cooling rate plays a k...
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MDPI AG
2023-01-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/2/581 |
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| author | Wen-Jian Liu Hong-Ying Li Wen-Hao Zhou Deng Luo Dan Liu Liang Liang Ai-Da Xiao |
| author_facet | Wen-Jian Liu Hong-Ying Li Wen-Hao Zhou Deng Luo Dan Liu Liang Liang Ai-Da Xiao |
| author_sort | Wen-Jian Liu |
| collection | DOAJ |
| description | The mechanical properties of steel’s inter-critically reheated coarse-grained heat-affected zone (ICR CGHAZ) directly affects the service life of machinery equipment. The hardness and toughness of ICR CGHAZ can be optimized simultaneously through tailoring microstructure where cooling rate plays a key role. In this work, the samples with different cooling rates was prepared using thermal simulation. The granite bainite (GB), bainite ferrite (BF) and MA were formed at a 1 °C/s (CR1) cooling rate, while BF and MA were formed at 10 °C/s (CR2) and 30 °C/s (CR3) cooling rates. With the increase of cooling rate, the effective grain size decreased and the number of hard phases increased, resulting in monotonic increase of hardness (260HV3, 298HV3 and 323HV3). CR1 had sparsely distributed coarse slender MA and CR3 possessed tail-head connected MA along PAGBs, which was detrimental to toughness. Therefore, CR2 possessed the best toughness(25J). The microstructural evolution mechanism of ICR CGHAZ with different cooling rates is investigated, corresponding hardening and toughening mechanisms are discussed. |
| first_indexed | 2024-03-09T11:50:51Z |
| format | Article |
| id | doaj.art-ca5f4ca9a02a44ae95a7957bdb489e85 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:50:51Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-ca5f4ca9a02a44ae95a7957bdb489e852023-11-30T23:15:17ZengMDPI AGMaterials1996-19442023-01-0116258110.3390/ma16020581Inter-Critically Reheated CGHAZ of Ultra-High-Strength Martensitic Steel with Different Cooling RatesWen-Jian Liu0Hong-Ying Li1Wen-Hao Zhou2Deng Luo3Dan Liu4Liang Liang5Ai-Da Xiao6School of Materials Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, ChinaXiangtan Iron & Steel Group Co., Ltd., Xiangtan 411101, ChinaXiangtan Iron & Steel Group Co., Ltd., Xiangtan 411101, ChinaXiangtan Iron & Steel Group Co., Ltd., Xiangtan 411101, ChinaHunan Valin Lianyuan Iron & Steel Co., Ltd., Loudi 417100, ChinaHunan Valin Lianyuan Iron & Steel Co., Ltd., Loudi 417100, ChinaThe mechanical properties of steel’s inter-critically reheated coarse-grained heat-affected zone (ICR CGHAZ) directly affects the service life of machinery equipment. The hardness and toughness of ICR CGHAZ can be optimized simultaneously through tailoring microstructure where cooling rate plays a key role. In this work, the samples with different cooling rates was prepared using thermal simulation. The granite bainite (GB), bainite ferrite (BF) and MA were formed at a 1 °C/s (CR1) cooling rate, while BF and MA were formed at 10 °C/s (CR2) and 30 °C/s (CR3) cooling rates. With the increase of cooling rate, the effective grain size decreased and the number of hard phases increased, resulting in monotonic increase of hardness (260HV3, 298HV3 and 323HV3). CR1 had sparsely distributed coarse slender MA and CR3 possessed tail-head connected MA along PAGBs, which was detrimental to toughness. Therefore, CR2 possessed the best toughness(25J). The microstructural evolution mechanism of ICR CGHAZ with different cooling rates is investigated, corresponding hardening and toughening mechanisms are discussed.https://www.mdpi.com/1996-1944/16/2/581ultra-high-strengthmartensitic steelGleeble thermal simulationinter-critical reheated CGHAZcooling rateMA constituents |
| spellingShingle | Wen-Jian Liu Hong-Ying Li Wen-Hao Zhou Deng Luo Dan Liu Liang Liang Ai-Da Xiao Inter-Critically Reheated CGHAZ of Ultra-High-Strength Martensitic Steel with Different Cooling Rates Materials ultra-high-strength martensitic steel Gleeble thermal simulation inter-critical reheated CGHAZ cooling rate MA constituents |
| title | Inter-Critically Reheated CGHAZ of Ultra-High-Strength Martensitic Steel with Different Cooling Rates |
| title_full | Inter-Critically Reheated CGHAZ of Ultra-High-Strength Martensitic Steel with Different Cooling Rates |
| title_fullStr | Inter-Critically Reheated CGHAZ of Ultra-High-Strength Martensitic Steel with Different Cooling Rates |
| title_full_unstemmed | Inter-Critically Reheated CGHAZ of Ultra-High-Strength Martensitic Steel with Different Cooling Rates |
| title_short | Inter-Critically Reheated CGHAZ of Ultra-High-Strength Martensitic Steel with Different Cooling Rates |
| title_sort | inter critically reheated cghaz of ultra high strength martensitic steel with different cooling rates |
| topic | ultra-high-strength martensitic steel Gleeble thermal simulation inter-critical reheated CGHAZ cooling rate MA constituents |
| url | https://www.mdpi.com/1996-1944/16/2/581 |
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