用氩弧熔化焊(MIG)在4020碳钢表面堆焊耐空泡腐蚀材料,然后采用TIG(钨极氩弧焊),将堆焊层改性;通过与传统磨削表面加工对比,研究了TIG表面重熔对空泡腐蚀的影响.结果表明:在45 h空泡腐蚀试验后,磨削试样的累积失重量是TIG表面重熔试样的1.57倍;奥氏体到马氏体的相变是Stellite 21材料吸收空泡冲击能的主要途径,而TIG表面重熔加工可以延迟相变,延长吸收空泡冲击的时间,减缓空蚀;TIG重熔表面抑制了片层状马氏体的裂纹发展,避免了大的物质剥落.
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