Abstract
This study aimed to investigate the erosion behavior and mechanism of a newly developed 25Cr3Mo2WNiV steel with a chrome coating using promoted ignition combustion tests. The erosion threshold pressure and temperature of the chrome-coated 25Cr3Mo2WNiV steel were determined to be 0.2 MPa and 254.3 K higher than those of traditional chrome-coated 30SiMn2MoV steel. Furthermore, Kirkendall voids and inter-diffusion between the Cr coating and matrix were first observed before erosion. The improved erosion resistance of the chrome-coated 25Cr3Mo2WNiV steel was attributed to the suppression of the Kirkendall effect, which minimized heat generation at the Cr/matrix interface by preventing oxygen diffusion and reducing oxygen affinity.
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