A Comparative Study on the Performance and Microstructure of 304NG Stainless Steel in Underwater and Air Laser Welding

被引:1
|
作者
Sun, Jiaqi [1 ]
Yang, Yue [1 ]
Wang, Kai [2 ]
Yin, Shaohua [1 ,3 ]
Li, Zhen [1 ]
Luo, Zhen [1 ]
机构
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China
[2] China Nucl Power Operat Co Ltd, Shenzhen 518124, Peoples R China
[3] Suzhou Nucl Power Res Inst Co Ltd, Suzhou 215004, Peoples R China
基金
中国国家自然科学基金;
关键词
underwater laser welding; stainless steel; welding morphology; microstructure; mechanical properties;
D O I
10.3390/ma17153854
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In order to facilitate the application of underwater laser welding technology in in situ repairs of nuclear power plants, this study conducted comparative experiments between local dry underwater laser welding and laser welding in air on 304NG nitrogen-controlled stainless steel. The aim was to explore its microstructural evolution and mechanical properties in underwater environments. It was found that, near the fusion line of laser welding in air, columnar dendrites gradually evolved into cellular dendrites toward the weld center, eventually disappearing, resulting in a skeletal ferrite and serrated austenite structure. The underwater laser welding joints exhibited similar characteristics yet with more pronounced alternation between columnar and cellular dendrites. Additionally, the size of cellular dendrites decreased significantly, and needle-like ferrite was observed at the weld center. The hardness of underwater laser welded joints was slightly higher than that of in-air laser welded joints. Compared to laser welding in air, the strength of underwater laser welding joints increased from 443 MPa to 471 MPa, and the displacement increased from 2.95 mm to 3.45 mm, both types of welded joints exhibited a mixed mode fracture characterized by plasticity and brittleness.
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页数:11
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