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材料工程  2015, Vol. 43 Issue (2): 7-13    DOI: 10.11868/j.issn.1001-4381.2015.02.002
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
激励电流对MGH956合金原位合金化TIG焊接头性能的影响
雷玉成1,2, 龚晨诚1, 罗雅1, 肖波1,3, 朱强1
1. 江苏大学 材料科学与工程学院, 江苏 镇江 212013;
2. 江苏大学 江苏省高端结构材料重点实验室, 江苏 镇江 212013;
3. 江苏沙钢集团淮钢特钢股份有限公司, 江苏 淮安 223002
Effect of Excitation Current on Tensile Properties of Joint of MGH956 Alloy by In-situ Alloying TIG Welding
LEI Yu-cheng1,2, GONG Chen-cheng1, LUO Ya1, XIAO Bo1,3, ZHU Qiang1
1. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
2. Jiangsu Province Key Laboratory of High-end Structural Materials, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
3. Jiangsu Shagang Group, Huai Steel Special Steel Co., Ltd., Huai'an 223002, Jiangsu, China
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摘要 通过高频调制TIG焊电弧激发超声,以自制焊料作为填充材料,在不同激励电流下对MGH956合金进行超声电弧原位合金化TIG焊接,研究了超声电弧对焊缝气孔分布、微观组织和接头性能的影响.结果表明:在激励电流为10A时,焊缝气孔尺寸明显变大,但数量减少,焊缝晶粒粗大;当激励电流提高到20A时,气孔数量急剧减少,焊缝晶粒细小均匀,颗粒状增强相弥散分布;激励电流增大到30A时,气孔进一步减少,但晶粒粗化.比较拉伸实验结果表明,激励电流为20A时,接头抗拉强度最高,为626MPa,达到了母材强度的87%,同时接头由沿晶脆性断裂变成韧-脆混合断裂形式.
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雷玉成
龚晨诚
罗雅
肖波
朱强
关键词 MGH956合金超声电弧TIG焊接气孔显微组织    
Abstract:The arc-ultrasonic was excited by modulating the TIG arc through high frequency and the homemade solder was filled in the weld as filler composite. The effect of arc-ultrasonic on pores, microstructures and mechanical properties of MGH956 alloy joints produced by arc-ultrasonic in-situ alloying TIG welding with different excitation current was investigated. The results show that when the excitation current is 10A, pores grow up obviously while the number of pores is reduced, moreover, the grains are coarse. When the excitation current increases to 20A, the number of pores sharply decreases, the grains are fine and uniform, and the particle reinforced phases are uniformly distributed in the weld. When the excitation current increases to 30A, the number of pores further decreases while the grains are coarsen. The tensile results indicate that the maximum tensile strength of the weld joint is achieved at an excitation current of 20A, which is 626MPa and reaches 87% of the base metal. The toughness of joints is improved obviously and the fracture surface changes from completely brittle fracture to ductile-brittle mixed fracture.
Key wordsMGH956 alloy    arc-ultrasonic    TIG welding    pore    microstructure
收稿日期: 2014-02-26     
1:  TG454  
基金资助:国家自然科学基金资助项目(51075191);江苏高校优势学科建设工程资助项目(PAPD);江苏省高校博士创新计划资助项目(cxlx12_0638)
通讯作者: 雷玉成(1962-),男,教授,博士生导师,主要从事焊接工艺及设备、焊接过程控制及模拟、先进材料连接技术等方面的研究与开发,联系地址:江苏省镇江市京口区学府路301号江苏大学材料学院(212013), E-mail: yclei@ujs.edu.cn     E-mail: yclei@ujs.edu.cn
引用本文:   
雷玉成, 龚晨诚, 罗雅, 肖波, 朱强. 激励电流对MGH956合金原位合金化TIG焊接头性能的影响[J]. 材料工程, 2015, 43(2): 7-13.
LEI Yu-cheng, GONG Chen-cheng, LUO Ya, XIAO Bo, ZHU Qiang. Effect of Excitation Current on Tensile Properties of Joint of MGH956 Alloy by In-situ Alloying TIG Welding. Journal of Materials Engineering, 2015, 43(2): 7-13.
链接本文:  
http://jme.biam.ac.cn/jme/CN/10.11868/j.issn.1001-4381.2015.02.002      或      http://jme.biam.ac.cn/jme/CN/Y2015/V43/I2/7
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