| 热处理工艺对低温贝氏体钢微观组织及力学性能的影响 |
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| 作者姓名： | 王昕愿 吴开明 董航宇 |
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| 作者单位： | 1.武汉科技大学国际钢铁研究院,湖北 武汉,430081;2.武汉科技大学高性能钢铁材料及其应用湖北省协同创新中心,湖北 武汉,430081,1.武汉科技大学国际钢铁研究院,湖北 武汉,430081;2.武汉科技大学高性能钢铁材料及其应用湖北省协同创新中心,湖北 武汉,430081,1.武汉科技大学国际钢铁研究院,湖北 武汉,430081;2.武汉科技大学高性能钢铁材料及其应用湖北省协同创新中心,湖北 武汉,430081 |
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| 基金项目： | 湖北省自然科学基金创新群体资助项目(2016CFA004). |
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| 摘 要： | 利用SEM、EBSD、XRD及力学性能测试等手段,对比研究了一步、两步等温贝氏体转变及贝氏体转变+深冷处理工艺对低温贝氏体钢显微组织及力学性能的影响。结果表明,相较于一步等温贝氏体转变工艺,两步等温贝氏体及贝氏体转变+深冷处理均可降低钢中块状残余奥氏体含量,细化晶粒;与两步等温贝氏体转变相比,深冷处理可以极大缩短工艺时间,所得材料在获得相近强度的同时,会牺牲部分韧性;两步等温贝氏体处理后,试验钢强塑积达到了19.66GPa·%,U型冲击吸收功可达80J,其综合力学性能最优。
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| 关 键 词： | 低温贝氏体钢 热处理工艺 贝氏体转变 深冷处理 残余奥氏体 微观组织 力学性能 |
| 收稿时间： | 2019/5/13 0:00:00 |
Effect of heat treatment on microstructure and mechanical properties of low-temperature bainite steel |
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| Authors: | Wang Xinyuan Wu Kaiming and Dong Hangyu |
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| Institution: | 1. International Research Insititute for Steel Technology, Wuhan University of Science and Technology, Wuhan 430081, China;2. Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, China,1. International Research Insititute for Steel Technology, Wuhan University of Science and Technology, Wuhan 430081, China;2. Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, China and 1. International Research Insititute for Steel Technology, Wuhan University of Science and Technology, Wuhan 430081, China;2. Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, China |
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| Abstract: | By means of SEM, EBSD, XRD and mechanical performance tests, the effects of heat treatment processes, including one-step and two-step isothermal bainite transformation as well as bainite transformation+deep cryogenic treatment (DCT), on the microstructure and mechanical properties of the low-temperature bainite steel were investigated comparatively. The results show that compared with one-step bainite isothermal treatment, the grain size and retained austenite content of the steel treated by two-step bainite isothermal treatment and bainite transformation+DCT decrease. Moreover, bainite transformation+DCT approach can significantly shorten the process time, and the as-treated steel can obtain the similar strengh with the steel treated by two-step bainite isothermal method, even at the expense of toughness. After two-step bainite isothermal treatment, the strength-plasticity product of the steel reaches 19.66 GPa·% and U-shaped impact absorption work reaches 80 J. The optimum comprehensive mechanical properties of the as-treated steel have been obtained. |
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| Keywords: | low-temperature bainite steel heat treatment process bainite transformation deep cryogenic treatment retained austenite microstructure mechanical property |
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