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OALib Journal期刊
ISSN: 2333-9721
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添加Sn粉激光焊接钢/铝合金异种金属的显微组织与性能
DOI: 10.3724/SP.J.1037.2012.00787, PP. 959-968
Keywords: 激光焊接,钢/铝合金异种金属,金属间化合物,添加Sn粉
Abstract:
采用光纤激光器对厚度为1.4mm的DC56D+ZF镀锌钢和厚度为1.2mm的6016铝合金平板试件进行了添加Sn粉的激光搭接焊实验,利用卧式金相显微镜、扫描电镜、X射线衍射和微机控制电子万能试验机等研究了添加Sn粉前后焊接接头各区域的金相组织、断口形貌、界面元素分布、主要物相与接头力学性能,采用基于密度泛函理论的第一性原理方法,计算了添加Sn后新形成物相FeSn和FeAl化合物的模量和热力学性能.结果表明,在激光功率为2000W,焊接速度45mm/s,离焦量+2.0mm,Ar气为保护气体且流量为15L/min的条件下,添加Sn粉焊接试样的焊缝表面成形性良好,焊缝区晶粒细小,焊接接头的平均剪切强度为62.17MPa,与没有添加Sn相比,剪切强度提高1.46倍.由于细晶强化,提高熔池金属的流动性,利于钢/铝合金界面结合,减少Fe--Al金属间化合物层厚度,新形成的FeSn的金属间化合物具有较好延性,高温下结构稳定,抑制或减少了Fe--Al脆性金属间化合物的生成,因而添加Sn粉改善了焊接接头的力学性能.
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