Microstructure and Tribological Properties of Stellite21 Coating by Electro-Spark Deposition

Abstract

Setellite21 cobalt-based alloy coating was deposited on 45 steel by electro-spark deposition. Microstructure and phase composition of the coating were analyzed. Wear resistance and wear mechanism of the coating were researched. The results indicate that the coating with compact structure is mainly composed of Co, Co6W6C, CoCx and CoCr. Average microhardness of the coating is 445.34 HV0.5, which is about 2 times to that of the substrate. The coating presents excellent wear resistance with no obvious peelings and scratches. Wear resistance of the coating is about 2.3~2.7 times to that of the substrate. Wear mechanism of the coating mainly contains abrasive wear and fatigue wear, and along with oxidization wear.

Enhanced corrosion and wear properties of H13 steel with Co‐based alloy coating prepared by laser cladding

“…Stellite 21 is a Co-based alloy with a certain amount of Cr, Mo, and minor Ni, C, and other alloying elements. [15,16] High Cr content in Stellite 21 helps to improve the corrosion resistance. Mo and Cr can also play the role of solid solution strengthening in the Cobased matrix and second phase strengthening by forming carbide phases.…”