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A. Evangeline,P. Sathiya 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
The solid solution strengthened Inconel 625, a Ni-based alloy is known for its excellent strength and good corrosion resistanceat extreme environments used in thermal plants, boiler tubes, petrochemical industry and power plant. The presence ofCr content (~ 20 wt%) along with Mo-rich, Nb and Fe makes Ni–Cr–Mo–Nb austenitic alloy called as Inconel 625 to achieveexcellent corrosion resistance property. Using cold metal arc transfer (CMT) cladding, the metallurgical, mechanical andcorrosion properties of Inconel 625 on 316L is evaluated. The process parameters selected includes welding current, torchangle and travel speed with a constant voltage. From the results of microstructural and EDS inferences, the formation of cellulardendritic structure with secondary phases like Laves phase, complex nitrides along with the interdendritic segregationof Mo and Nb as well as microsegregation of Cr, Ni and Fe. In case of Ni–Cr–Mo alloy, Ni and Cr contribute to resistance tocorrosion in NaCl environments. The formation of Cr2O3and the passivation action of the clad zone is due to the presence ofCr. The solid solution effect in Ni–Cr matrix is contributed by the presence of Nb and Mo. Apart from that the strengtheningaction happens due to the precipitation of Ni3(Al, Ti, Nb) commonly known as γ′, γ″ and MC carbides confirmed throughXRD. Uni-axial tensile tests and Vickers-micro hardness indentation tests were performed on Inconel 625 cladded over316L. Based on the fractographic results fatigue striations, tear rigdes with river markings, dimples with fibrous structureand cleavages are observed. Unlike other studies, unique type of cuboidal precipitates are seen, which is due to the presenceof Ti, which form carbonitrides containing Ti, which are further characterised as NbC. The potentiodynamic polarisationtests is performed on 3.5% NaCl solution. The results suggest that Ni–Cr–Mo alloy protects the substrate from corrosion.
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