Microstructure and Corrosion Behavior of the Laser Welded Joint for Hypoeutectoid U-Nb Alloy

被引:0
|
作者
Li Yubin [1 ]
Wang Xiangdong [1 ]
Wang Wei [1 ]
Pu Zheng [1 ]
Zhang Tongyan [1 ]
Wang Qinguo [1 ]
机构
[1] China Acad Engn Phys, Mianyang 621907, Peoples R China
关键词
hypoeutectoid U-Nb alloy; laser welding; microstructure; electrochemical corrosion; galvanic corrosion; MECHANICAL-PROPERTIES; URANIUM; OXIDATION; WELDMENT;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The microstructures and corrosion behavior of the hypoeutectoid U-Nb alloy laser welded joint were investigated by OM, SEM, XRD and electrochemical analysis. The results indicate that the grain size of the weld zone of the hypoeutectoid pearlite U-Nb alloy is about 50 mu m and the weld zone is only composed of alpha' martensite with orthogonal crystal structure. After immersion in 3.5%NaCl solution, the corrosion potential of weld metal is similar to 400 mV lower than the substrate's, and the corrosion couple forms between weld metal and the rest of the welded. The results of surface morphology and linear polarization show that the corrosion process of the welded joint includes galvanic corrosion and self-corrosion while galvanic corrosion behavior is the dominated. The corrosion current of welded joint is about 3 times higher than that of the substrate and 10 times higher than that of the weld metal. The overall anti-corrosion property of welded joint is depressed. The corrosion is uniform.
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页码:391 / 396
页数:6
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