期刊文献+

(Cr_2O_3+Al)粉末铝热剂对6061铝合金电阻点焊熔核的影响 被引量:2

Influence of (Cr_2O_3+Al) powder thermite on nugget in resistance spot welding of 6061 aluminum alloy
下载PDF
导出
摘要 通过添加Cr2O3+Al粉末铝热剂介入6061铝合金电阻点焊,研究Cr2O3+Al粉末铝热剂介入对电阻点焊熔核成形、显微组织、力学性能等质量因素的影响.研究结果表明,在Cr2O3+Al粉末铝热剂冶金反应提供的铝热反应热的辅助作用下,可以有效增大6061铝合金的熔核尺寸.由于反应热的释放使熔核中心周围区域温度梯度降低;Cr2O3+Al粉末铝热剂的添加,使熔核中心区域分布了更多的异质形核晶核,并促使凝固进程中的固—液界面前沿出现大范围成分过冷,从而更有利于等轴晶的形核.熔核中心等轴晶的分布更为均匀,枝晶束更为细小,并强化熔核胞状晶区,从而使焊点强韧性得到提高. The resistance spot welding of 6061 aluminum alloy with addition of Cr2O3 + Al powder thermite was conducted. With the assistance of reaction heat released by the metallurgical reaction of powder thermite,the quality factors,including the nugget formation,microstructure and mechanical property,were affected by the Cr2O3 + Al powder thermite during the welding. The experimental results show that the nugget dimensions of 6061 aluminum alloy spot weld was improved effectively as the reaction heat was released. Because the reaction heat lowered the temperature gradient and more heterogeneous nucleation distributed in the central zone of nugget with the addition of Cr2O3 + Al powder thermite,the large-scale composition supercooling was enlarged in front of the solid-liquid interface upon solidification. This was beneficial to the nucleation of isometric dentrite which was distributed more uniformly. The grain bundles were refined and the cellular crystal region was strengthened, which improved the strength of the spot weld.
作者 罗怡
出处 《焊接学报》 EI CAS CSCD 北大核心 2014年第1期63-66,71,共5页 Transactions of The China Welding Institution
基金 重庆市科委自然科学基金资助项目(cstcjjA50013)
关键词 电阻点焊 熔核 粉末铝热剂 显微组织 力学性能 resistance spot welding nugget powder thermite microstructure mechanical property
  • 相关文献

参考文献4

二级参考文献15

  • 1赵熹华,姜以宏.薄件点焊熔核凝固组织分析[J].焊接学报,1994,15(2):89-93. 被引量:14
  • 2赵熹华,徐国成,宣兆志,于海涛.弹簧钢电阻点焊[J].焊接学报,1996,17(2):128-132. 被引量:8
  • 3安阁英.铸件形成理论[M].北京:机械工业出版社,1998.144-148. 被引量:1
  • 4Zhou M, Zhang H, Hu S J. Relationships between quality and attributes of spot welds [ J]. Welding Journal, 2003,82(4) : 72s - 77s. 被引量:1
  • 5Cho Y, Rhee S. Experimental study of nugget formation in resistance spot welding [J]. Welding Journal, 2003, 82(8) : 195s - 200s. 被引量:1
  • 6Aslanlar S, Ogur A, Ozsarac U, et al. Welding time effect on mechanical properties of automotive sheets in electrical resistance spot welding [J]. Materials and Design, 2008, 29(7) : 1427 -1431. 被引量:1
  • 7Aslanlar S. The effect of nucleus size on mechanical properties in electrical resistance spot welding of sheets used in automotive industry [J]. Materials and Design, 2006, 27(2): 125-131. 被引量:1
  • 8Majumdar A,Tien C L.Fractal network model or contact conductance[J].Journal of Heat Transfer,1991,113(8):516-525. 被引量:1
  • 9中国机械工程学会焊接学会.焊接手册(第1卷)[M].北京:机械工业出版社,1992.. 被引量:7
  • 10. 被引量:1

共引文献19

同被引文献25

引证文献2

二级引证文献8

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部