In the composition of PTA wear-resistant hardfacing metal, C is one of the most important element. As the content of C increases, the wear resistance of the hardfacing layer increases, while its crack resistance becomes worse. Cr is an element that improves hardenability and is also a carbide formation element. Within a certain range, the content of Cr increases, the amount of martensite produced by the cladding metal increases, and the hardness of the PTA Hardfacing layer increases; Cr is also an element forming ferrite, and an appropriate amount of cr can reduce the y zone and the X zone Increase, with the Increased content and strength of ferrite in the hardfacing layer, and improve the toughness of the surfacing layer. V is a strong carbide forming element. Combined with carbon, it can form high hardness carbonized material points and reduce the amount of solid solution carbon. Improve the crack resistance of the deposited metal. At the same time, these carbonized material points have a high melting point, that is, a small amount of particles can be precipitated to form nuclei during the crystallization process. It is beneficial to inhibit the formation of carbide network and improve the toughness of the deposited metal The addition of trace rare earths can eliminate harmful impurities, purify the surfacing layer, and further improve the toughness of the surfacing layer.
