| Study on laser welded heat-affected zone in new ultralow carbon bainitic steel |
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| 引用本文： | Lin Zhao Wuzhu Chen Xudong Zhang Jiguo Shan. Study on laser welded heat-affected zone in new ultralow carbon bainitic steel[J]. 北京科技大学学报(英文版), 2007, 14(2): 136-140. DOI: 10.1016/S1005-8850(07)60027-9 |
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| 作者姓名： | Lin Zhao Wuzhu Chen Xudong Zhang Jiguo Shan |
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| 作者单位： | [1]Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China [2]Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Ministry of Education, Beijing 100084, China |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | 800 MPa grade ultralow carbon bainitic （NULCB） steel is the recently developed new generation steel, which was produced by thermo mechanical controlled processing ＆ relaxation-precipitation controlling transformation （TMCP＆RPC） tech- nique. The microstructure and the mechanical properties of the heat-affected zone （HAZ） in NULCB steel under laser welding conditions were investigated by using a Gleeble-1500 thermal simulator. The experimental results indicate that the simplex microstructure in the HAZ is granular bainite that consists of bainite-ferrite （BF） lath and M-A constituent when the cooling time from 800 to 500℃ （t8/5） is 0.3-30 s, and the M-A constituent consists of twinned martensite and residual austenite. As t8/5 increases, the hardness and tensile strength of HAZ decreases, but they are higher than that of the base metal, indicating the absence of softened zone after laser welding. The impact toughness of HAZ increases at first and then decreases when t8/5 increases. The impact energy of HAZ is much higher than that of the base metal when t8/5 is between 3 and 15 s. It indicates that excellent low temperature toughness can be obtained under appropriate laser welding conditions.
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| 关 键 词： | 超低碳贝氏体钢 激光焊接 热影响区 显微结构 NULCB钢 |
| 收稿时间： | 2006-06-10 |
Study on laser welded heat-affected zone in new ultralow carbon bainitic steel |
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| Lin Zhao,Wuzhu Chen,Xudong Zhang,Jiguo Shan. Study on laser welded heat-affected zone in new ultralow carbon bainitic steel[J]. Journal of University of Science and Technology Beijing, 2007, 14(2): 136-140. DOI: 10.1016/S1005-8850(07)60027-9 |
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| Authors: | Lin Zhao Wuzhu Chen Xudong Zhang Jiguo Shan |
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| Affiliation: | Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Ministry of Education, Beijing 100084, China |
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| Abstract: | 800 MPa grade ultralow carbon bainitic (NULCB) steel is the recently developed new generation steel, which was produced by thermo mechanical controlled processing & relaxation-precipitation controlling transformation (TMCP&RPC) technique. The microstructure and the mechanical properties of the heat-affected zone (HAZ) in NULCB steel under laser welding conditions were investigated by using a Gleeble-1500 thermal simulator. The experimental results indicate that the simplex microstructure in the HAZ is granular bainite that consists of bainite-ferrite (BF) lath and M-A constituent when the cooling time from 800 to 500°C (t8/5) is 0.3-30 s, and the M-A constituent consists of twinned martensite and residual austenite. As t8/5 increases, the hardness and tensile strength of HAZ decreases, but they are higher than that of the base metal, indicating the absence of softened zone after laser welding. The impact toughness of HAZ increases at first and then decreases when tw increases. The impact energy of HAZ is much higher than that of the base metal when t8/5 is between 3 and 15 s. It indicates that excellent low temperature toughness can be obtained under appropriate laser welding conditions. |
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| Keywords: | ultralow carbon bainitic steel laser welding heat-affected zone microstructure mechanical properties |
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