理化检验-物理分册2025，Vol.61Issue(8)：1-3,26,4.DOI:10.11973/lhjy-wl250123
铝合金构件开裂原因
Reasons for cracking of aluminum alloy components
郭海霞 1张欣耀 2杨晓 3徐宁 1陈洁明 3袁晓冬1
作者信息
- 1. 洛阳船舶材料研究所,洛阳 471023
- 2. 洛阳船舶材料研究所,洛阳 471023||河南省船舶及海工装备结构材料技术与应用重点实验室,洛阳 471023||海洋腐蚀与防护全国重点实验室,洛阳 471023
- 3. 洛阳船舶材料研究所,洛阳 471023||海洋腐蚀与防护全国重点实验室,洛阳 471023
- 折叠
摘要
Abstract
A crack appeared near the weld seam of a 7 series aluminum alloy component used in a certain marine installation.The causes of component cracking were analyzed by macroscopic observation,chemical composition analysis,scanning electron microscopy and energy spectrum analysis,metallographic examination.The results show that the paint on the surface of the component partially peeled off,causing direct contact with corrosive media and resulting in pitting corrosion.Chain like η-MgZn2 phase precipitated along the grain boundary in the heat affected zone under welding thermal cycling,reducing the corrosion resistance of the grain boundary.There was also significant welding residual stress in this area,which led to crack initiation at the pitting corrosion pit and ultimately resulted in component cracking.关键词
7系铝合金/海洋大气环境/析出相/应力腐蚀/点蚀坑Key words
7 series aluminum alloy/marine atmospheric environment/precipitation phase/stress corrosion/corrosion pit分类
通用工业技术引用本文复制引用
郭海霞,张欣耀,杨晓,徐宁,陈洁明,袁晓冬..铝合金构件开裂原因[J].理化检验-物理分册,2025,61(8):1-3,26,4.
