Cui Shuwan, Xian Zhiyong, Shi Yonghua, Liao Baoyi, Zhu Tao
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
Guangdong Provincial Engineering Research Center for Special Welding Technology and Equipment, South China University of Technology, Guangzhou 510640, China.
Materials (Basel). 2019 May 20;12(10):1638. doi: 10.3390/ma12101638.
In this paper, the microstructure and impact toughness of a S32101 duplex stainless steel underwater local-dry keyhole tungsten inert gas welded joint were studied. The impact toughness value of the underwater weld metal reached 78% of the onshore weld metal, which is in accordance with the underwater welding standards. The proportion of austenite in the underwater weld metal was 0.9% lower than that of the onshore weld metal. The proportion of the Σ3 coincidence site lattice boundaries and random phase boundaries in the underwater weld metal, which significantly influence the impact toughness of the weld metal, were smaller than that of the onshore weld metal.
本文研究了S32101双相不锈钢水下局部干法小孔钨极惰性气体保护焊焊缝的微观组织与冲击韧性。水下焊缝金属的冲击韧性值达到陆上焊缝金属的78%，符合水下焊接标准。水下焊缝金属中奥氏体的比例比陆上焊缝金属低0.9%。对焊缝金属冲击韧性有显著影响的Σ3重合位置点阵边界和随机相位边界在水下焊缝金属中的比例比陆上焊缝金属小。
