铝/钢旋转摩擦焊接头微观组织与腐蚀性能不均匀性研究

李鹏; 马超群; 李艳光; 董红刚

doi:10.7512/j.issn.1001-2303.2020.09.06

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铝/钢旋转摩擦焊接头微观组织与腐蚀性能不均匀性研究
Inhomogeneous microstructure and corrosion resistance of aluminum/steel rotary friction welded joints
2020年50卷第9期页码：60-68
纸质出版：2020
DOI： 10.7512/j.issn.1001-2303.2020.09.06
稿件说明：

移动端阅览

李鹏, 马超群, 李艳光, 等. 铝/钢旋转摩擦焊接头微观组织与腐蚀性能不均匀性研究[J]. 电焊机, 2020,50(9):60-68. DOI： 10.7512/j.issn.1001-2303.2020.09.06.

LI Peng, MA Chaoqun, LI Yanguang, et al. Inhomogeneous microstructure and corrosion resistance of aluminum/steel rotary friction welded joints[J]. Eletric Welding Machine2020, 50(9): 60-68. DOI： 10.7512/j.issn.1001-2303.2020.09.06.

摘要

研究了5052铝合金/304不锈钢旋转摩擦焊接头热处理前后径向不同位置处的微观组织和腐蚀性能。结果表明:焊态下

接头因界面产热和压力分布不均匀

导致径向不同位置处金属间化合物分布特征不同

中心位置处(Center)无金属间化合物分布

0.25R、0.5R、0.75R处金属间化合物呈连续分布。接头径向不同区域存在腐蚀性能不均匀性

耐腐蚀性能顺序为:0.75R>0.5R>Center>0.25R。经过250℃/20 min焊后热处理

接头残余应力得到释放

微观组织均匀化

腐蚀性能径向不均匀性消失。

Abstract

The microstructure and corrosion resistance of AA5052/304 SS rotary friction welded joints before and after heat treatment was studied. The results show that the distribution characteristics of intermetallic compounds along the radial direction in the as-welded joint were different

due to the inhomogeneity of heat generation and pressure at the interface. No intermetallic compound formed at the center but distributed continuously at 0.25 R

0.5 R

and 0.75 R. Inhomogeneity of corrosion resistance in different areas of the joint was observed

and the corrosion resistance was ranked as: 0.75 R>0.5 R>Center>0.25 R. After heat treatment at 250 ℃/20 min

the residual stress in the joint was released

the microstructure was homogenized

and the radial inhomogeneity of the corrosion resistance disappeared.