摘要
采用激光熔覆技术分别在304不锈钢、2205不锈钢基材表面熔覆了stellite 6和stellite 12钴基合金涂层.通过显微硬度分析、金相显微镜、扫描电子显微镜、能谱仪和模拟海水电位腐蚀试验,分别研究了在不同不锈钢基材上两种合金熔覆层的显微硬度、微观结构组织、物相、微观形貌、熔池形貌以及腐蚀性能.并结合激光熔覆工艺分析了熔覆层的底部、中部以及顶层的晶相和Co、Cr成分的分布,通过对比分析发现,在2205双相不锈钢衬底上熔覆的stellite 12镀层具有更高的熔覆层界面硬度.腐蚀试验表明,stellite 12镀层较stellite 6镀层具有更好的耐腐蚀性.
Abstract
The laser cladding technology was used to clad stellite 6 and stellite 12 cobalt-based alloy coatings on the surfaces of 304 stainless steel and 2205 stainless steel substrates,respectively.The microhardness analysis,optical microscopy(OM),scanning electron microscopy(SEM),energy spectrometer(EDS)and simulated seawater potential corrosion test were used to investigate the microhardness,microstructural organization,phase,microtopography,molten pool morphology and corrosion performance of the two alloy cladding layers on different stainless steel substrates.Combined with the laser cladding process,the distributions of crystal phases and Co,Cr components in the bottom,middle and top layers of the cladding layer was analyzed.Through comparative analysis,it was found that the stellite 12 coating on the 2205 duplex stainless steel substrate had higher interfacial hardness of the cladding layer.The corrosion test showed that the stellite 12 coating had better corrosion resistance than the stellite 6 coating.
国家科技期刊平台
NSTL
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