Sliding Wear of TiCN PVD Coated Prealloyed Chromium Sintered Steel

Abstract

The present paper deals with the sliding wear behaviour of prealloyed chromium sintered steel (Fe-1.5Cr-0.2Mo) with graphite powder added in the amount of 0.7%. The wear characteristics, such as profilograms, wear tracks morphology and wear curves of the as sintered specimens and TiCN coating were investigated through pin-on-disk tests. The specimens were sintered in pusher furnace at the temperature of 1453 K for 2400 s in a nitrogen-hydrogem atmosphere. Dominant bainitic microstructures with evident features of plastic deformation at the worn surface were detected. The coating of the investigated prealloyed steels increases the wear resistance in comparison with the as-sintered state according to the wear curves. Microstructural and EDX analyses confirmed that delamination and oxidation wear are the main wear mechanism in wear tests.

Keywords

• vacuum heat treatment
• sintered steel
• microstructure
• fracture
• 81.05.bx
• 81.20.ev
• 81.40.-z
• 81.70.bt