Hardness and Microstructure Analysis of Deposit Material Based on Fe-Cr-Ni

The paper deals with the hardness, chemical composition (using spectrometer) and microstructure (using light microscopy and scanning electron microscopy with EDX spot analysis) of the weld deposit based on Fe-Cr-Ni used for renovation of the functional surface of wheel for mineral wool spinning and with impacts of operational processes onto these characteristics. Deposit samples were analysed after service wear having an abrasive-erosive-thermal character. Analysis results were compared to a deposit sample with no wear. Based on results of weld deposit microstructure analysis, duplex ferrite-austenitic structure with ferrite matrix and austenite precipitation in various morphologies was found in the all cases. No substantial hardness changes caused by operational processes were found by comparing the analyses results. Increased melt temperature was the most important process parameter affecting the chemical and phase composition of the examined material, inducing the precipitation of new phase with a high Cr content.