Transition Microstructures and Properties in the Laser Additive Manufacturing Repair of Monel K-500 (UNS N05500) and Toughmet 3AT (UNS C72900)

The laser powder-fed additive manufacturing (AM) of Alloy 625 (UNS N06625) on two heat-treatable, high-strength, and copper-rich alloys, such as Monel K-500 (UNS N05500) and Toughmet 3AT (UNS C72900), has been investigated to determine the suitability of AM for the repair of high-value oilfield parts requiring good machinability, magnetic transparency, anti-galling resistance, and general corrosion resistance. In contrast to conventional laser cladding, AM deposition rates can be greatly reduced to minimize thermal effects, chemical dilution, and number of powder-fed deposits, while still producing a top surface that fully meets Alloy 625 specification. This paper presents and discusses test results from microstructural analyses, chemical composition, electron-backscatter diffraction (EBSD), and microhardness indentation measurements on both Monel K-500 and Toughmet 3AT.