| 焊接热输入对低合金高强钢焊缝组织和韧性的影响 |
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| 引用本文： | 陈玉喜,刘亮,张华军,陈华斌,陈善本.焊接热输入对低合金高强钢焊缝组织和韧性的影响[J].上海交通大学学报,2015,49(3):306-309. |
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| 作者姓名： | 陈玉喜 刘亮 张华军 陈华斌 陈善本 |
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| 作者单位： | （1.上海交通大学 材料科学与工程学院，上海 200240； 2.上海振华重工（集团）股份有限公司，上海 200125） |
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| 基金项目： | 国家自然科学基金项目(51105252，61374071)，上海市科委科技计划项目(11111100302)资助 |
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| 摘 要： | 摘要： 针对海上钻井平台桩腿用厚板低合金高强钢Q690E，研究不同焊接热输入对接头焊缝显微组织及冲击韧性的影响.结果表明，当热输入从1.376 MJ/m提高到2.248 MJ/m时，焊缝区冲击韧性先升高再降低.当焊接热输入为1.56 MJ/m时，焊缝区微观组织以针状铁素体为主，低温韧性最好；采用小电流低速焊焊缝区组织更加均匀，冲击断口韧窝区所占比例更大，低温韧性更高；在热输入相同的条件下，单丝熔化极活性气体保护焊焊缝区以针状铁素体和粒状贝氏体为主，低温韧性优于双丝焊.
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| 关 键 词： | 低合金高强钢 焊接热输入 焊缝 显微组织 冲击韧性 |
| 收稿时间： | 2014-07-03 |
Effect of Heat Input on Microstructure and Toughness of Weld Joint of High-Strength Low Alloy Steel |
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| CHEN Yu xi,LIU Liang,ZHANG Hua jun,CHEN Hua bin,CHEN Shan ben.Effect of Heat Input on Microstructure and Toughness of Weld Joint of High-Strength Low Alloy Steel[J].Journal of Shanghai Jiaotong University,2015,49(3):306-309. |
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| Authors: | CHEN Yu xi LIU Liang ZHANG Hua jun CHEN Hua bin CHEN Shan ben |
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| Institution: | (1. School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Shanghai Zhenhua Port Machinery Co., Ltd, Shanghai 200125, China) |
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| Abstract: | Abstract： High strength low alloy steel Q690E thick plate of offshore drilling platform was welded by GMAW with different heat inputs. The effect of heat input on the microstructure and toughness of weld joint was investigated. The results indicated that the microstructure of the weld mainly consisted of acicular ferrite, and the best low temperature toughness could be obtained at the heat input 1.56 MJ/m. Under the condition of the same welding heat input, the microstructure of the weld was more uniform and the low temperature toughness was better at smaller welding current and slower welding speed. Besides, under the condition of the same heat input, the microstructure of the weld from robotic single wire MAG welding was based on acicular ferrite and granular bainite. Moreover, the toughness of the weld metal of robotic single wire MAG welding was better than twin wire MAG welding.
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| Keywords: | high-strength low-alloy steel weld heat input weld joint microstructure toughness |
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