Effect of TiC-Cr3C2 Particles Content on Abrasive Wear Resistance of Co-Base Overlay Weld Alloy.

Abstract

This study was concerned with the production of carbide dispersion type composite materials by plasma transfer arc welding. The composite materials were produced by introducing different amounts of Cr-carbide and/or Ti-carbide powders in Co-base alloy (Stellite 6). To assess the resistance to wear of the composite materials, rubber wheel abrasion test was performed on surface of the composite materials.The composite materials were consisted of Co-alloy matrix and non-fused carbide. The average hardness of matrix was increased from HV450 to HV850 according to Cr-carbide content of the composite material.Weight loss of composite materials by wear were decreased from 850 mg to 50 mg according to volume fraction of non-fused carbide particles. Especially when mean free path between carbide particles was smaller than size silica sand (wear material), abrasive wear resistance of composite materials was rapidly improved.