Study on Microstructure and Impact Abrasion Wear Resistance of In-Situ Ticp/Hcci Dual Scale Composites

Abstract

The in situ TiCp/HCCI composites with a dual scale was fabricated by cast infiltration. A moderator was introduced to control TiCp volume fraction and size. Analyze the moderator effects on composites phases by First principles calculations and the effects on the impact wear resistance. Ti and Mn in the moderator improved the deformation resistance of the phases in the matrix, while Fe and Mn enhanced the toughness of TiC. The higher the content of moderator in composites, the smaller the volume fraction and particle size of TiC. When the content of moderator is 20 wt.%, the volume fraction of TiC in the composites is 58.91%, the particle size is 3.15μm and its wear resistance is 2.03 times that of HCCI.

Keywords: In-situ, TiC, Wear mechanism, First-principle calculations