| 新颖的贝氏体/铁素体双相低碳微合金钢 |
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| 引用本文： | 尚成嘉,杨善武,王学敏,贺信莱.新颖的贝氏体/铁素体双相低碳微合金钢[J].北京科技大学学报,2003,25(3):288-290. |
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| 作者姓名： | 尚成嘉 杨善武 王学敏 贺信莱 |
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| 作者单位： | 北京科技大学材料科学与工程学院,北京,100083 |
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| 基金项目： | 国家重大基础研究“973”项目(No.19980601507)，中信-CBMM铌钢研究与开发项目，教育部骨干教师基金 |
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| 摘 要： | 利用特殊微合金设计及终轧控冷工艺得到超细贝氏体／铁素体双相低碳微合金钢。该钢的组织由原奥氏体晶界上及晶粒内部的约5μm的准多边形铁素体及超细化的贝氏体板条束组成。铁素体的体积分数约20％。该双相低碳微合金钢的强度比同成分的全贝氏体钢略低，但其延伸率却大幅度提高。采取适当的回火处理，该双相钢屈服强度可达到700MPa，而延伸率大于25％，是一种具有高强度、高塑性的新型低碳微合金双相钢。
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| 关 键 词： | 双相低碳微合金钢 贝氏体 铁素体 延伸率 屈服强度 塑性 |
| 修稿时间： | 2003年2月17日 |
A Bainite/Ferrite Dual-Phase Low-carbon Microalloying Steel with High Strength and Ductility |
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| SHANG Chengjia,YANG Shanwu,WANG Xuemin,HE xinlai
Materials Science and Engineering School,University of Science and Technology Beijing,Beijing ,China.A Bainite/Ferrite Dual-Phase Low-carbon Microalloying Steel with High Strength and Ductility[J].Journal of University of Science and Technology Beijing,2003,25(3):288-290. |
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| Authors: | SHANG Chengjia YANG Shanwu WANG Xuemin HE xinlai
Materials Science and Engineering School University of Science and Technology Beijing Beijing China |
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| Institution: | SHANG Chengjia,YANG Shanwu,WANG Xuemin,HE xinlai
Materials Science and Engineering School,University of Science and Technology Beijing,Beijing 100083,China |
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| Abstract: | A ferrite/ bainite dual-phase low-carbon microalloying steel has been obtained by special microal-loying design and optimum thermo-mechanical control process(TMCP). The microstructure shows that there are some amounts of ferrite/quasi-polygonal ferrite on the prior-austenite boundary and/or within the grains, and the rest of matrix is ultra-fine lath-like bainitic ferrite. The ferrite grain size is also very fine (about several microns ). The mechanical properties of this kind of dual-phase steel show that the yield strength do not decrease obviously comparing with the ultra-fine bainitic steel, but the elongation increases. For a 700 MPa grade dual-phase steel (tempering at 680C for 1h), the elongation is more than 25%. This kind of dual-phase low-carbon microalloying steel has the advantages of more than 700 MPa grade strength and good ductility. |
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| Keywords: | low carbon microalloying steel bainite/ferrite dual-phase high strength and ductility |
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