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| 镀锌Q & P980钢电阻点焊接头液态金属脆裂纹的影响因素分析 |
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孔谅, 凌展翔, 王泽, 王敏, 潘华, 雷鸣1,2,3
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1. 上海交通大学 上海市激光制造与材料改性重点实验室, 上海 200240;2.
2. 高新船舶与深海开发装备协同创新中心, 上海 200240;3.
3. 宝钢研究院汽车用钢研究所 宝山钢铁股份有限公司, 上海 201900
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| 摘要: |
| 新一代超高强Q&P淬火延性钢在具有高强度的同时具有较好的断后伸长率，在车身制造中具有广阔的应用前景.然而在对镀锌Q&P980钢进行电阻点焊试验后，在焊接接头中发现了表面裂纹，前期研究表明该表面裂纹是由液态金属脆化机制所引起的，即钢板在液态锌和应力的共同作用下发生的沿晶界开裂.结果表明，点焊中的工艺参数，包括焊接电流、焊接时间及电极压力、以及加工条件，包括电极端面形状、加压模式、电极对中度均会对接头中的液态金属脆裂纹产生不同程度的影响，因此可以通过调整工艺参数及加工条件来降低裂纹的敏感性. |
| 关键词: 高强钢 电阻点焊 液态金属脆 裂纹 |
| DOI：10.12073/j.hjxb.2018390171 |
| 分类号:TG453.9 |
| 基金项目:国家重点研发计划资助（2017YFB0304400） |
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| Study on influence factors of liquid metal embrittlement cracks in resistance spot welded joints of galvanized Q & P980 steel |
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KONG Liang, LING Zhanxiang, WANG Ze, WANG Min, PAN Hua, LEI Ming1,2,3
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1. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiaotong University, Shanghai 200240, China;2.
2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China;3.
3. Baosteel Central Research Institute, Baosteel Group Corporation, Shanghai 201900, China
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| Abstract: |
| The new generation ultrahigh strength Q & P (Quenching and Partitioning) steel owns both high strength and fine ductility, it has wide application prospect in automobile industry. However, after carrying out resistance spot welding experiment on the galvanized high strength Q & P980 steel plates, cracks were detected on the surface of joint, former researches showed that the cracks were caused by liquid metal embrittlement (LME), that was the steel plates were intergranular fractured under the effect of liquid zinc and stress. Experiment results indicated that process parameters (including welding current, welding time and electrode force) and process conditions (including electrode morphology, pressure mode and electrode alignment) were found to have influence on the LME cracks of joints. Thus, there is a possibility to reduce the crack sensibility by adjusting the process parameters and conditions. |
| Key words: high strength steel resistance spot welding liquid metal embrittlement crack |
