The Wear Resistance Mechanisms and Decision of Critical Normal Load for In-situ Granular γ+(Fe, Mn)3C/γ Steel Matrix Composites.

Based on pin on disc dry sliding tests and scanning electron microscopy (SEM) observation, the sliding wear behaviors of granular &gamma+(Fe, Mn)₃C eutectics reinforced austenite matrix composites (abbreviated EAMC) under dry wear condition were studied. The wear testing shows that the wear process of EAMC can be divided into running-in and steady state regimes. The serious plastic deformation and flow occur to austenite matrix of EAMCin the running-in regime. The dominant wear mechanism of EAMC is the delamination wear at the steady state regime. The &gamma+(Fe, Mn)₃Ceutectic particles, as the main body against the normal load and abrasive wear, can delay the formation of dislocation depleted zone and accumulation of abrasive on the counterpart surfaces. Therefore, the probability of the debris formation and flaked decreases, which results in the decrement of wear rate for EAMC and the increment of critical normal load above which severe wear occurs to EAMC. The criterion on the critical normal load for particulate reinforced composites was revised. The calculated results agree well with the experimental ones for EAMC. [ABSTRACT FROM AUTHOR]