Abstract：The nitrogen-alloying hardfacing alloy deposited layer was made through nitrogen instead of part of carbon and addition of the nitrogen-fixing elements of niobium,vanadium and titanium. The erosion tests were conducted at impact angles of 30, and the erosion wear mechanisms of hardfacing alloy were deeply analyzed. The results showed that spall of cutting and furrow were observed on surface of hardfacing alloy due to the impacting effect of high velocity water flow with sand. The predominant erosion wear mechanism of hardfacing alloy was micro chips by the cutting of erosion particles. A large number of fine carbonitride homogeneously precipitated out of martensitic matrix and grain boundary of hardfacing alloy, which can strengthen matrix metal and enhance hardness of hardfacing alloy. So the hardfacing alloy can be protected effectively from wearing of the erosion particles and the erosion wear resistance of hardfacing alloy was improved slightly. The wear characteristic of nitrogen-alloying hardfacing alloy was mainly included cutting, furrow and block desquamation at the place of carbonitride caused by the erosion particles.
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