Friction and Wear Properties of CoCrFeNiMnSnx High Entropy Alloy Coatings Prepared via Laser Cladding

Abstract

Due to its unique single-phase multivariate alloy characteristics and good low-temperature mechanical properties, CoCrFeNiMn high entropy alloy (HEA) has attracted the interest of many researchers in recent years. In this paper, to improve the wear resistance of Q235 alloy steel surface, CoCrFeNiMnSnx HEA coatings were prepared on the surface of Q235 steel via laser cladding. X-ray diffractometry, optical microscopy, scanning electron microscopy (SEM), and energy dispersive spectrometry were used to determine the microstructure and chemical composition. The research findings revealed that the CoCrFeNiMn HEA coatings were formed from a single FCC phase. As the Sn content in the coating increased, a new MnNi2Sn phase formed. Microhardness and friction and wear results showed that when the mole content of Sn was 0.2, the hardness of the CoCrFeNiMn HEA coating was increased by approximately 45%, the friction coefficient decreased by 0.168, and the wear loss decreased by 16.6%. Three-dimensional noncontact morphology and SEM results revealed that the wear mechanisms of CoCrFeNiMn HEA coatings were abrasive wear, delamination wear and a small amount of oxidative wear under dry friction conditions, whereas the friction mechanisms of CoCrFeNiMnSn0.2 HEA coatings were primarily abrasive wear and oxidative wear.

Wear‐Resistance of High‐Entropy Alloy Coatings and High‐Entropy Alloy‐Based Composite Coatings Prepared by the Laser Cladding Technology: A Review

“…The hardest Ti 0.75 coating was 1.46 times harder than that of the Ti 0 coating, and the wear volume was only 12% of the wear volume of the Ti 0 coating. In addition to the Ti‐containing metallic compounds, intermetallic compounds were also generated by the addition of elements such as Sn [ 57 ] and Nb. [ 58 ] However, too many intermetallic compounds increase the brittleness of the coating, and the coating forms cracks at an earlier stage, resulting in reduced wear resistance.…”

Wear Resistance Prediction of AlCoCrFeNi-X (Ti, Cu) High-Entropy Alloy Coatings Based on Machine Learning

“…Moreover, there are many factors affecting wear, such as material composition, preparation, hardness, surface roughness, wear parameters, etc. [20][21][22][23][24]. These factors often have nonlinear relationships.…”

Research and Progress of Laser Cladding: Process, Materials and Applications

“…At present, the research on the properties of the LC layer is mainly focused on wear resistance, corrosion resistance, high-temperature oxidation resistance, self-lubrication and biocompatibility. One of the main methods to improve the wear resistance of the cladding layer is to directly add or in situ synthesize the hard phase, and the other is to improve the wear resistance of the coating by adding lubricants [43][44][45][46][47][48][49].…”