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采用钨极氩弧焊(TIG)将新型Cr-Ni-Mo和Cr-Ni-Co合金堆焊于304不锈钢表面进行空蚀试验,通过失重比较不同合金的抗空蚀性能。采用扫描电镜(SEM)、X射线衍射(XRD)仪和显微硬度计对合金层进行分析。结果表明:Cr-Ni-Mo和Cr-Ni-Co合金的耐空蚀性能均优越于304不锈钢,其中Cr-Ni-Co优于Cr-Ni-Mo;空蚀破坏优先出现在堆焊层的晶界处;Cr-Ni-Co合金在空蚀过程中发生了因奥氏体向马氏体的转变,有利于能量吸收,延缓了空蚀的进行,提高其耐空蚀性能;堆焊合金的抗空蚀能力与合金本身的硬度和加工硬化能力有关。
New Cr-Ni-Mo and Cr-Ni-Co alloys were deposited on the surface of 304 stainless steel by TIG welding. The cavitation erosion test was carried out on the surface of 304 stainless steel. The cavitation resistance of different alloys was compared by weight loss. The alloy layer was analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and microhardness tester. The results show that the cavitation erosion resistance of Cr-Ni-Mo and Cr-Ni-Co alloys is superior to that of 304 stainless steel, Cr-Ni-Co is better than Cr-Ni-Mo; Boundary; Cr-Ni-Co alloy in the cavitation process occurred due to austenite to martensite transformation is conducive to energy absorption, delayed cavitation erosion, to improve its resistance to cavitation erosion; surfacing alloy resistance Cavitation erosion ability and its own hardness and hardening ability.