ENHANCED HARDFACING ALLOY AND A METHOD FOR THE DEPOSITION OF SUCH AN ALLOY

摘要

The invention relates to a nickel-basedalloy, comprising a nickel matrix, and alloying elements chromium, boron and silicon, whereby the Si:B ratio is between 1:2 and 3:1, the resulting Ni-Cr-B-Si alloy comprising 0.5-5.0 wt.% Nb, whereby the Nb:B ratio is between 1:2 and 2:1. The invention further relates to a method for manufacturing at least a first hardfacing layer on a substrate, comprising heating a nickel based alloy to above the solidus temperature to obtain an at least partially molten alloy; depositing the at least partially molten nickel based alloy on the substrate, the alloy comprising nickel, chromium, boron, silicon, and 0.5-5.0 wt.% Nb; and cooling the deposited alloy to at least below the solidus temperature for obtaining a layer with a microstructure comprising boride particles formed with at least one of chromium and niobium, a nickel in solid solution phase nucleated on and enclosing the boride particles and nickel-boron- silicon binary and ternary eutectic phases between the nickel solid solution dendrites. Furthermore, the invention relates to a substrate having a layer deposited thereon, the layer comprising the hardfacing nickel based alloy.In addition, the invention relates to a three-dimensional structure comprising the hardfacing nickel based alloy.