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      저자 : Mojtaba Naalchian (검색결과 1 건)
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        Effect of Substrate's Heat Treatment on Microstructure and Mechanical Properties TLP Bonding of Dissimilar X-45/FSX-414 Cobalt Based Superalloys

        Mojtaba Naalchian,Masoud Kasiri‑Asgarani,Morteza Shamanian,Reza Bakhtiari,Hamid Reza Bakhsheshi‑Rad 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11

        In this study, a dissimilar joint of cobalt based superalloys X-45 and FSX-414 has been created under the standard heattreatment conditions with the nickel-based BNi-9 interlayer with the thickness of 50 μm by the transient liquid phase bondingprocess. Solution heat treatment (1150 °C/4 h) was used for bonding and the aging heat treatment (980 °C/4 h) for thehomogenization of the bond. Optical metallography, Field Emission Scanning Electron Microscope with Energy DispersiveX-ray Spectroscopy, Differential scanning calorimetry, micro-hardness test and shear strength test were used for the characterizationof microstructural and mechanical evolution in base metals and bonds. The solution heat treatment leads to thedissolution of a part of the M23C6and M6Ccarbides in the substrate of superalloys, which due to the aging heat treatmentsecondary and fine carbides M23C6precipitate in the substrate and help strengthen the superalloys. The diffusion of theboron from the molten interlayer to the base metals resulted in the complete isothermal solidification and a nickel-basedsingle-phase solid solution has been developed. Cobalt-chromium-tungsten-molybdenum-based carboborides precipitationwith high hardness in the vicinity of the isothermal solidification zone and in base metals results in the non-homogeneityof microhardness profile along the bonding area. Homogenization heat treatment did not have an effect on the omission ofthese precipitations, but by more uniform redistribution of the alloying elements strengthen solid solution that could increaseshear strength from 655 to 688 MPa, which is somewhat equivalent to the shear strength of the 45-X alloy and also 93% ofthe shear strength of the FSX-414 alloy.

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