Laser cladding is an emerging tool for the repair of critical aerospace components, with damaged areas ground away and replaced with fresh material. Previous investigations for high strength steels have shown single layer repairs to produce overly hard clads comprised of untempered martensite, with further heat treatments required to produce acceptable mechanical properties. In this investigation, the microstructure and hardness of a multi-layer clad of 300M steel on 300M substrates were analysed to determine the viability of in-situ heat treatment via interlayer tempering. The top portion of the clad consisted of a very hard region of untempered martensite (∼640 HV) compared to the substrate (∼580 HV). This region extends to the AC3 isotherm achieved during cladding. The lower portion of the clad comprises of a much softer tempered region (∼490HV), and consists of tempered martensite with blocky austenite. In addition, islands of blocky reverted austenite form along solute enriched former cell boundaries. This region is found below the AC1 isotherm and begins just below the second highest clad layer. While this demonstrates the ability of multi-layer builds to produce a tempered microstructure the as-repaired state, further optimisation of the process parameters is needed to better match the hardness of clad and substrate.
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