Abstract
The mechanisms that characterise the local scratch behaviour of the matrix of an IN625-Cr3C2 composite coating were determined and compared with those of the same Inconel alloy clad. The study was performed for both the coatings in the as-deposited condition and after high-temperature exposure. The coatings were deposited by laser cladding. Scratch tests with a Berkovich sharp indenter were carried out on the surface of the coatings. A model to calculate the volume displaced during the scratch tests was proposed, and the contributions of the four main mechanisms that describe the local scratch behaviour were investigated. The analysis of the results showed that microploughing characterises the IN625 clads behaviour. The formation of M7C3 carbides in the composites' matrix, arising from the partial fusion of the Cr3C2 particles during the deposition, transform the main scratch mechanism into a microcutting process. After exposure at high temperature, microploughing continues to be the main mechanism that describes the IN625 behaviour, but the formation of secondary phases constrains the plastic deformation, increasing the scratch resistance. The behaviour of the composite matrix was affected only by the exposure at the highest temperatures where the local scratch resistance results increased and microcutting remained the most important mechanism.
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