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采用熔化极活性气体保护焊,在Q345低合金钢表面堆焊奥氏体不锈钢,其过渡层和耐蚀层材料分别为ER309L和ER347L不锈钢焊丝。对堆焊层进行弯曲和剪切性能测试,并对堆焊层的显微组织及剪切断口形貌进行了观察。结果表明,过渡层设计提高了堆焊层的弯曲和剪切性能,堆焊层组织主要以铁素体和奥氏体为主,还存在微量Cr的碳化物脆性相,剪切断口均显示以韧窝状为主的韧性断裂形貌。
Welded austenitic stainless steel was welded on the surface of Q345 low-alloy steel with the melting active gas arc welding. The materials of the transition layer and the corrosion-resistant layer were ER309L and ER347L stainless steel welding wire respectively. Bending and shearing properties of the surfacing layer were tested, and the microstructure of the surfacing layer and the appearance of shear fracture were observed. The results show that the design of the transition layer improves the bending and shearing properties of the overlay layer. The overlay layer mainly consists of ferrite and austenite, with the brittle phase of Cr carbide. The shear fracture shows that Ductile-based ductile fracture morphology.