Effect of Interlayer Coating with TiC Particles on Microstructure and Properties of Wire Arc Additive Manufactured SS316L Parts
摘要
In this investigation, SS316L/TiC metal matrix composites were deposited using a wire arc additive manufacturing (WAAM) system. The reinforcement ranging from 1-4 wt.% was introduced using an interlayer coating method. Microstructural, mechanical, and wear characteristics were evaluated to analyze the influence of particle reinforcement. Microstructural analysis revealed progressive grain refinement with increasing TiC. The average microhardness increased from 227 ± 6 HV0.1 in unreinforced sample to 413 ± 7 HV0.1 at 4wt.% TiC. Further, the highest ultimate tensile strength of 834 ± 29 MPa, 803 ± 15 MPa was observed in deposition and build directions, respectively, at 4 wt.% TiC, which is attributed to grain refinement and grain size strengthening. A transition from ductile failure mode in the control sample to mixed ductile–brittle fracture in the 4 wt.% composite was observed. Tribological testing indicated that wear rate and coefficient of friction decrease with TiC content, with the 4 wt.% composite resulting in ~ 94% reduction in wear rate.