Abstract
Unlubricated sliding wear performance of a newly developed, continuously cooled carbide free bainitic steel was evaluated. Effect of different applied load on wear mechanisms and other surface and subsurface modifications have been studied. It was observed that the wear mechanism was changed from predominantly abrasive to adhesion and fatigue as the load was increased. Up to 3.9 fold increase in the phase fraction of martensite, ~24% increase in microhardness from the as-received material and 100% higher dislocation density were observed at the worn surface of sample for the highest loading condition. Bending of grains, cracks were observed in sub-surface regions. The steel showed excellent wear resistance property arising from its great work hardening capability due to the transformation of metastable retained austenite to strain induced martensite.
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