| 含Cu的Mn-Nb-B系超低碳贝氏体钢的强韧化机理 |
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| 引用本文： | 程久珊,刘 静,镇 凡,徐进桥,郭 斌.含Cu的Mn-Nb-B系超低碳贝氏体钢的强韧化机理[J].有色金属(冶炼部分),2011(7):39-42. |
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| 作者姓名： | 程久珊 刘 静 镇 凡 徐进桥 郭 斌 |
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| 作者单位： | 1. 武汉科技大学材料与冶金学院,武汉,430081
2. 武汉钢铁,集团,公司研究院,武汉,430080 |
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| 摘 要： | 对一种含铜超低碳Mn-Nb-B系微合金钢进行TMCP工艺,得到屈服强度达850 MPa的超低碳贝氏体钢。采用光学显微镜和扫描电子显微镜对试验钢不同板厚处的组织进行观察与分析,通过透射电子显微镜分析试验钢板条贝氏体间析出物,结果表明,屈服强度850 MPa超低碳贝氏体钢组织主要为细小的板条贝氏体,沿板厚方向上贝氏体板条宽度变化不大,板条长度从表层到心部逐渐增大。贝氏体板条的细化和微细析出物的形态、大小及分布对试验钢的强韧性起决定作用。
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| 关 键 词： | 金属材料 超低碳贝氏体钢 板条贝氏体 细晶强化 析出强化 |
High Strength and Toughness Mechanism of Ultra-low Carbon Bainitic Steel Containing Cu in Mn-Nb-B Micro-alloy |
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| CHENG Jiu-shan,LIU Jing,ZHEN Fan,XU Jin-qiao and GUO Bin.High Strength and Toughness Mechanism of Ultra-low Carbon Bainitic Steel Containing Cu in Mn-Nb-B Micro-alloy[J].Nonferrous Metals(Extractive Metallurgy),2011(7):39-42. |
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| Authors: | CHENG Jiu-shan LIU Jing ZHEN Fan XU Jin-qiao and GUO Bin |
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| Affiliation: | College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;Research Institute of Wuhan Iron and Steel Group Corporation, Wuhan 430080, China;Research Institute of Wuhan Iron and Steel Group Corporation, Wuhan 430080, China |
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| Abstract: | Ultra low carbon bainite steel with yield strength up to 850MPa is gained through TMCP treatment on the copper-containing Mn-Nb-B micro-alloyed steel. The microstructures with different distances from the face are investigated by means of the optical microscope and scanning electron microscope (SEM). The precipitates in the lath bainite are described through the transmission electron microscopy (TEM). The results show that the microstructure of the ULCB steel with yield strength up to 850MPa is mainly composed of fine lath bainite. Along the thickness of the steel plate, the width of the lath bainite does not present obvious change, but the length increases from the surface to the center. The lath bainitic microstructure refinement and fine precipitates play a decisive role in the experimental steel. |
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| Keywords: | metal material ultra low carbon bainitic steel lath bainite fine-grained strengthening precipitation strengthening |
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