Evaluation of the tribological properties of metal matrix composite materials (MMCs) obtained by additive manufacturing using selective laser melting (SLM)

TL;DR

This study investigates the mechanical and tribological properties of steel matrix composites reinforced with ceramic particles, manufactured via selective laser melting, revealing optimal reinforcement levels for wear resistance.

Contribution

First to evaluate tribological properties of SLM-produced steel matrix composites with varying ceramic reinforcement percentages.

Findings

Wear rate decreases with increased reinforcement content.

Optimal properties achieved at 6 wt.% reinforcement.

Friction coefficient shows no clear correlation with reinforcement level.

Abstract

The mechanical and tribological properties of steel matrix composites (316L stainless steel reinforced with Cr3C2 ceramic particles) were investigated. The steel matrix composites (SMC) with three reinforcing percentages (3, 6, and 9 wt.%) were manufactured by Additive Manufacturing technologies (SLM: Selective Laser Melting). The wear behaviour was studied by using a pin-on-disk wear test at room temperature. The worn surface was analysed using Scanning Electron Microscopy (SEM). The results indicated that the friction coefficient does not have a clear tendency or direct correlation with the reinforcement variation while the wear rate decreases with increasing content of reinforcement. The better properties combination were achieved with 6 wt.% of reinforcement.