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采用超音速火焰(HVOF)喷涂在1Cr18N i9Ti不锈钢基体上制备了200μm厚的Fe基(含Cr、N i等)合金涂层。采用金相显微镜、扫描电镜、显微硬度计、磁致伸缩汽蚀仪对涂层的组织、硬度和抗汽蚀性能进行了研究。结果表明,Fe基合金涂层组织均匀致密,孔隙率低,具有层状结构,涂层的平均硬度为993 HV0.1,是基体硬度的5.8倍;Fe基涂层抗汽蚀性能明显优于1Cr18N i9Ti不锈钢,1Cr18N i9Ti不锈钢汽蚀沿晶界和孪晶界破坏,而Fe基合金涂层汽蚀沿表面微小孔隙破坏,破坏由孔隙边缘向外扩展,损伤程度由汽蚀试样表面中心向外递减,最终不同损伤程度的汽蚀坑分布于表面。
A 200μm thick Fe-based (including Cr, Ni, etc.) alloy coating was prepared on a 1Cr18Ni9Ti stainless steel substrate by HVOF spraying. The microstructure, hardness and cavitation resistance of the coatings were investigated by optical microscope, scanning electron microscopy, microhardness tester and magnetostrictive cavitation. The results show that the microstructure of the Fe-based alloy coating is uniform and compact with low porosity and layered structure. The average hardness of the coating is 993 HV0.1, which is 5.8 times that of the matrix. The cavitation erosion resistance of the Fe-based coating is obviously better than 1Cr18N i9Ti stainless steel, 1Cr18Ni9Ti stainless steel cavitations along the grain boundary and twin boundaries destruction, and Fe-based alloy coating cavitation along the surface of the micro-pore damage, destruction of the outward expansion from the edge of the pore, the damage level from the center of the surface of the cavitation sample The cavitation pits with decreasing degrees and finally different degrees of damage are distributed on the surface.