STRUCTURE AND MECHANICAL AND TRIBOTECHNICAL PROPERTIES OF IRON–HIGH-CARBON FERROCHROME DOPED WITH Ni₃B ADDITIVES

Abstract

The production conditions and mechanical and tribotechnical properties of iron–high-carbon ferrochrome FKh800 materials doped with nickel boride were studied. It is shown that Ni₃B additives provide the formation of a multiphase ad microheterogeneous matrix-reinforced structure consisting of chromium steel and solid inclusions of complex chromium–iron carbides such as Ме₇С₃ and Ме₂₃С₆. When the doping content increases from 3.5 to 7.0 wt.%, complex Fe–Cr carbides and carboborides form, decreasing the hardness and bending strength and increasing the abrasive wear resistance of the base material from 5.0 to 12.2 km/mm. The Fe–35% FKh800 materials containing 5–7 wt.% Ni₃B are found to be promising compositions that combine acceptable mechanical properties and improved abrasive wear resistance.