Effects of continuous cooling and isothermal cooling parameters on microstructure and mechanical properties of EH420 marine steel
This study aims to investigate the effects of continuous cooling after deformation at 900 °C and isothermal cooling after deformation at 830 °C on the microstructure and mechanical properties of EH420 steel, emphasizing ferrite structure evolution. As the continuous cooling rate increases from 0.3 °...
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Elsevier
2025-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424028710 |
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| author | Hui Liu Zhiqiang Wu Guili Xu Junhong Yu Daheng Xiao Wenhao Zhou Biao Deng Xuhui Liu Jun Hu |
| author_facet | Hui Liu Zhiqiang Wu Guili Xu Junhong Yu Daheng Xiao Wenhao Zhou Biao Deng Xuhui Liu Jun Hu |
| author_sort | Hui Liu |
| collection | DOAJ |
| description | This study aims to investigate the effects of continuous cooling after deformation at 900 °C and isothermal cooling after deformation at 830 °C on the microstructure and mechanical properties of EH420 steel, emphasizing ferrite structure evolution. As the continuous cooling rate increases from 0.3 °C/s to 50 °C/s at 900 °C, the fraction of ferrite and pearlite decreases, while the percentage of bainite and martensite increases. Correspondingly, the hardness increases from 180 HV5 to 323 HV5. Meanwhile, the ferrite undergoes a transformation from polygonal to an elongated morphology, and the average grain size decreases from 13.6 ± 6.3 μm to 3.7 ± 1.5 μm due to fast cooling, which limits grain growth. During the isothermal cooling process, the microstructure mainly consists of ferrite, pearlite, and a mixed structure of bainite and martensite. When the cooling rate increases from 0.3 °C/s to 3 °C/s at 830 °C, the average grain size of polygonal ferrite decreases from 8.7 ± 3.2 μm to 5.4 ± 3.5 μm, while the hardness increases from 199 HV5 to 233 HV5. The isothermal cooling process can result in equiaxed ferrite grains with a smaller size and promote the formation of pearlite and bainite with high dislocation density. |
| format | Article |
| id | doaj-art-f8062e2614ce49c39ada307cb1a0aab9 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-f8062e2614ce49c39ada307cb1a0aab92025-01-19T06:25:17ZengElsevierJournal of Materials Research and Technology2238-78542025-01-0134490500Effects of continuous cooling and isothermal cooling parameters on microstructure and mechanical properties of EH420 marine steelHui Liu0Zhiqiang Wu1Guili Xu2Junhong Yu3Daheng Xiao4Wenhao Zhou5Biao Deng6Xuhui Liu7Jun Hu8Sanya Institute of Hunan University of Science and Technology, Sanya, 572024, China; Engineering Research Center of Mineral Resources Development Technology and Equipment for Deep Sea and Deep Earth Ministry of Education, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, ChinaSanya Institute of Hunan University of Science and Technology, Sanya, 572024, China; Engineering Research Center of Mineral Resources Development Technology and Equipment for Deep Sea and Deep Earth Ministry of Education, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China; Corresponding author. Sanya Institute of Hunan University of Science and Technology, Sanya, 572024, China.Sanya Institute of Hunan University of Science and Technology, Sanya, 572024, China; Engineering Research Center of Mineral Resources Development Technology and Equipment for Deep Sea and Deep Earth Ministry of Education, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, ChinaSchool of Mechanical Engineering and Mechanics, Xiangtan University, Xiangtan, 411105, Hunan, ChinaHunan Iron and Steel Group Technology Research Institute Co., Ltd, Changsha, 410004, Hunan, ChinaHunan Valin Xiangtan Iron & Steel Group Co., Ltd, Xiangtan, 411101, Hunan, ChinaHunan Valin Xiangtan Iron & Steel Group Co., Ltd, Xiangtan, 411101, Hunan, ChinaTechnology Center, Hunan Valin Lianyuan Lron and Steel Co., Ltd, Loudi, 417009, Hunan, ChinaState Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, ChinaThis study aims to investigate the effects of continuous cooling after deformation at 900 °C and isothermal cooling after deformation at 830 °C on the microstructure and mechanical properties of EH420 steel, emphasizing ferrite structure evolution. As the continuous cooling rate increases from 0.3 °C/s to 50 °C/s at 900 °C, the fraction of ferrite and pearlite decreases, while the percentage of bainite and martensite increases. Correspondingly, the hardness increases from 180 HV5 to 323 HV5. Meanwhile, the ferrite undergoes a transformation from polygonal to an elongated morphology, and the average grain size decreases from 13.6 ± 6.3 μm to 3.7 ± 1.5 μm due to fast cooling, which limits grain growth. During the isothermal cooling process, the microstructure mainly consists of ferrite, pearlite, and a mixed structure of bainite and martensite. When the cooling rate increases from 0.3 °C/s to 3 °C/s at 830 °C, the average grain size of polygonal ferrite decreases from 8.7 ± 3.2 μm to 5.4 ± 3.5 μm, while the hardness increases from 199 HV5 to 233 HV5. The isothermal cooling process can result in equiaxed ferrite grains with a smaller size and promote the formation of pearlite and bainite with high dislocation density.http://www.sciencedirect.com/science/article/pii/S2238785424028710EH420 steelFerrite transformationCooling rateContinuous coolingIsothermal cooling |
| spellingShingle | Hui Liu Zhiqiang Wu Guili Xu Junhong Yu Daheng Xiao Wenhao Zhou Biao Deng Xuhui Liu Jun Hu Effects of continuous cooling and isothermal cooling parameters on microstructure and mechanical properties of EH420 marine steel Journal of Materials Research and Technology EH420 steel Ferrite transformation Cooling rate Continuous cooling Isothermal cooling |
| title | Effects of continuous cooling and isothermal cooling parameters on microstructure and mechanical properties of EH420 marine steel |
| title_full | Effects of continuous cooling and isothermal cooling parameters on microstructure and mechanical properties of EH420 marine steel |
| title_fullStr | Effects of continuous cooling and isothermal cooling parameters on microstructure and mechanical properties of EH420 marine steel |
| title_full_unstemmed | Effects of continuous cooling and isothermal cooling parameters on microstructure and mechanical properties of EH420 marine steel |
| title_short | Effects of continuous cooling and isothermal cooling parameters on microstructure and mechanical properties of EH420 marine steel |
| title_sort | effects of continuous cooling and isothermal cooling parameters on microstructure and mechanical properties of eh420 marine steel |
| topic | EH420 steel Ferrite transformation Cooling rate Continuous cooling Isothermal cooling |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424028710 |
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