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| X80管线钢焊接粗晶区组织与韧性的研究 | |
| 引用本文： | 薛小怀,周昀,钱百年,李晶丽,楼松年.X80管线钢焊接粗晶区组织与韧性的研究[J].上海交通大学学报,2003,37(12):1854-1857. |
| 作者姓名： | 薛小怀 周昀 钱百年 李晶丽 楼松年 |
| 作者单位： | 1. 上海交通大学,材料科学与工程学院,上海,200030;中国科学院金属研究所,沈阳,110016 2. 上海交通大学,材料科学与工程学院,上海,200030 3. 中国科学院金属研究所,沈阳,110016 |
| 基金项目： | 国家重点基础研究发展规划(973)项目(G1998061511) |
| 摘 要： | X80钢经焊接热模拟后粗晶区组织明显粗化，韧性显著下降．低碳时在粗晶区中的贝氏体铁素体板条间形成的硬而脆的Fe3C是恶化粗晶区韧性的主要原因．超低碳时在粗晶区中形成的马氏体-奥氏体(M-A)组元的含量比低碳时少，M-A组元中残余奥氏体所占的比例大，由于马氏体中偏聚的碳含量低，因而其塑性好，同时因超低碳抑制了Fe3C碳化物的形成而改善了粗晶区的韧性． |
| 关 键 词： | 管线钢 焊接热模拟 粗晶区 超低碳 贝氏体铁素体 马氏体-奥氏体组元 |
| 文章编号： | 1006-2467(2003)12-1854-04 |
Coarse Grain Heat Affect Zone Microstructures and Toughness of X80 Pipeline Steel |
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| XUE Xiao-huai.Coarse Grain Heat Affect Zone Microstructures and Toughness of X80 Pipeline Steel[J].Journal of Shanghai Jiaotong University,2003,37(12):1854-1857. | |
| Authors: | XUE Xiao-huai |
| Institution: | XUE Xiao-huai~ |
| Abstract: | X80 pipeline steels produced by thermo-mechanical control process(TMCP)have high strength and high toughness with ultra-fine microstructure. The microstructure becomes coarsening and the toughness becomes worsening at the coarse grain heat affect zone (CG HAZ) after welding simulation. The hard and brittle Fe_3C carbide formed between the bainitic ferrite laths in low carbon condition is the main cause of the above phenomenon. The ultra-low carbon content in base metal can improve the CG HAZ toughness through restraining the formation of carbides. Compared with low carbon in base metal, ultra-low carbon content decreases the martensite-austenite constituent (M-A) content and increases the residual austenite(A) content, which improves the toughness of CG HAZ. |
| Keywords: | pipeline steel weld simulation coarse grain heat (affect) zone(CG HAZ) ultra-low (carbon ) bainitic ferrite martensite-austenite constituent |
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