摘要
Abstract
The weld microstructure and electrochemical corrosion properties of dissimilar stainless steel laser welded joints of duplex/austenitic steel were compared before and after solution heat treatment.The results show that in the welds without heat treatment,the structure of the ferrite matrix,grain boundary austenite,and Westenitic austenite are formed near the side welds of austenitic steel.The weld structure in the middle of the weld and the side of the two-phase steel is dominated by bulk ferrite and grain boundary austenite,and the Weisstenite is significantly reduced.In addition,it can be found that a typi-cal beach-like structure is formed at the weld fusion line on one side of the austenitic steel.In addition,a partial Cr-rich σ phase appeared in the weld.After solid solution treatment,the structure is mainly austenite,and there is no obvious σ precipi-tation behavior.The corrosion resistance of the weld after solution heat treatment was significantly improved,and the elec-tron transfer resistance increased from 1.0×106～6.2×106 Ω.The stability range of the passivated film increased to-0.391～0.57V,and the electrochemical corrosion pit decreased significantly,and the pitting behavior was inhibited significantly.关键词
异种不锈钢/激光焊接/热处理/组织/腐蚀性能Key words
dissimilar stainless steel/laser welding/heat treatment/microstructure/corrosion performance分类
金属材料
