The wear behaviours of G20CrNi2MoA carburised steel under different temperature

The wear behaviours of G20CrNi2MoA carburised steel under different temperature was investigated in this work. The microstructure and morphology of the worn surface and cross-section of the specimen were characterised by scanning electron microscope (SEM). It is found that the average friction coefficient increases from 0.464 to 0.563 and the wear rate increases from 3.0 × 10–6 mm3N–1m–1 to 21.1 × 10–6 mm3N–1m–1 with the increase of temperature from room temperature (RT) to 200oC. The percentage of oxygen content on the worn surface increases from 11.66% to 36.12% with the increasing temperature, and the main wear mechanism changed from abrasive wear to oxidation wear. The average diameter of the carbides at the subsurface increases from 0.16 μm to 0.24 μm with the increase of temperature. Additionally, the micro crack and voids can be found around the large carbides at 200oC, resulting in the increase of wear rate. Copyright © 2020 Inderscience Enterprises Ltd.