| 亚纳米超细贝氏体钢的组织和性能 |
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| 引用本文： | 补丛华,徐光,邹航,王翔.亚纳米超细贝氏体钢的组织和性能[J].材料热处理学报,2012,33(9):89-94. |
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| 作者姓名： | 补丛华 徐光 邹航 王翔 |
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| 作者单位： | 1. 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉,430081
2. 加拿大McMaster大学材料科学与工程系,加拿大汉密尔顿L8S4L7 |
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| 基金项目： | 国家自然科学基金面上项目，宝钢汽车用钢与应用关键技术国家重点实验室重点项目，湖北省教育厅重点项目 |
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| 摘 要： | 为了缩短贝氏体转变时间并减少生产成本,设计并冶炼了一种新的贝氏体钢种,在Gleebe-1500热模拟实验机上测定其热膨胀曲线,结合显微组织图绘制了实验钢的CCT曲线。根据CCT曲线进行低温等温转变实验,对热处理试样进行拉伸试验,获得了实验钢低温转变后的力学性能。通过TEM观察发现低温转变的实验钢是由亚纳米级的超细贝氏体、马氏体等组成的一种超细贝氏体钢。340℃×2 h的低温等温转变,实验钢的抗拉强度达到1470 MPa,伸长率为15%。
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| 关 键 词： | 贝氏体 热处理 微观组织 力学性能 残留奥氏体 |
Microstructure and properties of sub-nano ultra-fine beinite steel |
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| BU Cong-hua,XU Guang,ZOU Hang,WANG Xiang.Microstructure and properties of sub-nano ultra-fine beinite steel[J].Transactions of Materials and Heat Treatment,2012,33(9):89-94. |
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| Authors: | BU Cong-hua XU Guang ZOU Hang WANG Xiang |
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| Affiliation: | 1.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Educaton,Wuhan University of Science and Technology,Wuhan 430081,China;2.Department of Materials Science and Engineering, McMaster University,Hamilton L8S 4L7,Canada) |
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| Abstract: | In order to shorten transformation time of bainite and reduce the production cost,a new bainite steel was designed and refined.The CCT diagram of the tested steel was obtained by combining the thermal expansion curves measured on a Gleebe-1500 hot simulator and microstructure observation of the steel after simulation tests.According to the CCT diagram,isothermal heat treatment tests were carried out at a low bainite transformation temperature and tensile tests were performed to examine the mechanical properties.The results show that the tested steel is ultra-fine beinite steel consisting of sub-nano scale bainite and martensite.The ultimate strength of 1470 MPa and the total elongation of 15% are obtained for the steel after isothermal treatment at 340 ℃ for 2 h.It is found that the advanced beinitic steel with a good combination of strength and plasticity can be produced by normal heat treatment route and low-cost chemical composition design. |
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| Keywords: | bainite heat treatment microstructure mechanical property retained austenite |
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