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李刚,张井波.Ni35掺杂高碳铬铁粉激光熔覆涂层组织性能研究[J].稀有金属材料与工程(英文),2018,47(6):1830~1835.[Li Gang and Zhang Jingbo.Study on Microstructure and Properties of Ni35 with High Carbon Ferrochrome Powders by Laser Cladding[J].Rare Metal Materials and Engineering,2018,47(6):1830~1835.]
Study on Microstructure and Properties of Ni35 with High Carbon Ferrochrome Powders by Laser Cladding
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Received:May 09, 2016  Revised:September 27, 2017
Key words: laser cladding  high carbon ferrochrome  microstructure  corrosion resistance
Foundation item:辽宁省自然科学资助(No.:2014020155);辽宁省科学事业公益研究基金(No:2014003007)
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Li Gang and Zhang Jingbo  
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      The Ni35 powder with different mass fraction (the contents are 0%, 25%, 50%, 75% and 100% respectively) of high carbon ferrochrome powder was prepared on the surface of 27SiMn steel using laser cladding technology. The microstructure and the phase of the laser cladding layers were studied by the means of OM, SEM, EDS and XRD. Using micro-hardness tester, abrasive wear machine and electrochemical corrosion tester, the mechanical and corrosion properties of the laser cladding layers were studied. The experimental results show that: the phases of the cladding layers without high carbon ferrochrome are γ-Ni、FeNi3 and Cr2Ni3. When the content is 50%, the α-Cr and (Cr, Fe)7C3 are produced while the Cr2Ni3 disappears. With increasing the content of high carbon ferrochrome, the lath microstructures increase and coarsen constantly. When the content is 50%, Cr element enrichment happens in the petal-looking microstructure of the upper cladding layer and the lath microstructure of the middle cladding layer, and the light gray microstructure is γ-Ni. And with the content increasing, the micro-hardness increase while the wear rate reduce. When the content is 25%, the maximum dilution rate is 20.80% and when the content is 50%, the cladding layers have the best corrosion resistance, and the corrosion current density is the least, which is 0.39 μA/cm2.