Abstract
In this study, effect of high temperature heat treatment on microstructure and erosive wear performance of Ni-based clad was investigated. The clad was developed on a hydroturbine steel (CA6NM) substrate using microwave hybrid technique. The as-clad microstructure comprised of rod-like Cr enriched M7C3 carbides in γ-(Ni, Fe) solid solution. Post clad heat treatment at 750 °C led to M7C3→M23C6 transformation accompanied by increase in carbide volume fraction. On the other hand, heat treatment at 1000 °C clad resulted in partial dissolution of the eutectic carbides. Among the tested samples, 750 °C heat treated sample exhibited higher erosion resistance. The erosive wear behaviour of Ni-based clad, before and after heat treatment, showed good correlation with hardness (at 30°) and elastoplasticity (at 90°).
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