| 等温温度和时间对超级贝氏体钢Fe-0.40C-2.2Mn-1.5Si相变和组织性能的影响 |
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| 作者姓名： | 刘曼 徐光 周明星 田俊羽 袁清 |
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| 作者单位： | 1.武汉科技大学省部共建耐火材料与冶金国家重点实验室,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.武汉科技大学省部共建耐火材料与冶金国家重点实验室,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.武汉科技大学省部共建耐火材料与冶金国家重点实验室,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.武汉科技大学省部共建耐火材料与冶金国家重点实验室,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.武汉科技大学省部共建耐火材料与冶金国家重点实验室,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： | 国家自然科学基金面上项目(51274154)；湖北省科技创新专项重大项目(2017000011). |
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| 摘 要： | 以超级贝氏体钢Fe-0.40C-2.2Mn-1.5Si为对象,通过热模拟试验、扫描电镜、X射线衍射分析和拉伸试验等方法,研究等温转变温度和保温时间对试验钢的贝氏体相变、微观组织和力学性能的影响。结果表明,随着等温转变温度的降低,钢的显微组织中贝氏体形貌从颗粒状贝氏体转变为板条状贝氏体,其强度逐渐提高,但伸长率和强塑积先增大后减小;随着保温时间的增加,钢的抗拉强度逐渐降低,而伸长率和强塑积逐渐增大,因此可通过适当延长相变时间来改善钢的综合力学性能;在350℃下保温90min时,试验钢显微组织中残余奥氏体体积分数最大,且具有最大强塑积。
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| 关 键 词： | 贝氏体钢 等温温度 保温时间 相变 残余奥氏体 显微组织 力学性能 |
| 收稿时间： | 2017/5/19 0:00:00 |
Effects of isothermal temperature and holding time on phase transformation, microstructure and properties of super bainitic steel Fe-0.40C-2.2Mn-1.5Si |
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| Authors: | Liu Man Xu Guang Zhou Mingxing Tian Junyu and Yuan Qing |
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| Institution: | 1.State Key Laboratory of Refractories and Metallurgy, 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.State Key Laboratory of Refractories and Metallurgy, 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.State Key Laboratory of Refractories and Metallurgy, 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.State Key Laboratory of Refractories and Metallurgy, 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.State Key Laboratory of Refractories and Metallurgy, 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: | The effects of isothermal temperature and holding time on bainitic transformation, microstructure and properties of a super bainitic steel Fe-0.40C-2.2Mn-1.5Si were studied by thermal simulating test, SEM, XRD and tensile tests. The results show that with the decrease of isothermal temperature, microstructure of the steel changes from granular bainite to lath-like bainite, and its strength gradually improves while its elongation and product of strength and elongation (PSE) first increase and then decrease. In addition, with the extension of isothermal holding time, the tensile strength decreases whereas the elongation and PSE increase. So the comprehensive mechanical properties of the bainitic steel can be improved by prolonging the transformation time properly. The steel sample transformed at 350 °C for 90 min has the maximum volume fraction of retained austenite and the optimum PSE. |
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| Keywords: | bainitic steel isothermal temperature temperature holding time phase transformation retained austenite microstructure mechanical property |
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