将Fe--Cr--Ni--Co合金堆焊在304不锈钢表面, 再对冷却后的堆焊层进行表面重熔, 进行不同时间的空蚀实验。采用失重分析、扫描电镜(SEM)和X射线衍射仪分析空蚀后的合金层, 与304不锈钢和堆焊层对比, 研究了表面重熔对耐空蚀性能的影响。结果表明: 堆焊层和重熔层的耐空蚀性能远高于304不锈钢, 重熔后的合金层其耐蚀性优于堆焊层; 在空蚀过程中发生了奥氏体向马氏体的转变, 吸收了空蚀能量, 延缓了空蚀的进行; 堆焊合金的表面重熔使晶粒细化, 细化的晶粒对裂纹发展的阻止作用提高了耐空蚀性能。
A new type of Fe–Cr–Ni–Co overlaying alloy was prepared by argon tungsten–arc welding (TIG) on 304stainless steel, after cooling to room temperature, the weld cladding layer was remelted by TIG. The effect of remelting on the resistance to cavitation erosion property was investigated and the result was compared with that of 304 stainless steel and weld–cladding layer. The alloy layer was analyzed by weight loss analysis, scanning electron microscopy (SEM) and X–ray diffractometer (XRD). Results indicating that the grain size in remelting layer was smaller. The resistance to cavitation erosion property of overlaying and remelting layer was better than that of 304 stainless steel and remelting layer is even better than that of overlaying. Phase transformation from austenite to martensite happened in the cavitation erosion process, which absorbed the energy of cavitation erosion and delayed the process of cavitation erosion. The refined grains by TIG remelting process in the overlaying alloy prevented the development of cracks and enhanced the cavitation erosion resistance property effectively.
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