Study On Tribological Performance Of Three Commonly Used Wear-resistant Steels

In this paper,different experiments of three commercial wear-resistance steels had been done,including sliding wear tests,two-body abrasion wear test,three-body abrasion wear test and impact abrasion wear tests;besides these wear tests,the mechanical properties,worn surface morphology and work-hardening mechanism of these steels also had been researched.The medium manganese steel had the best wear-resistance performance in quartz sand sliding-wear tests,two-body and three-body abrasion wear test with quartz sand tests.The Mn13 had the worst wear-resistance performance in two-body gangue abrasion wear tests,three-body coal power abrasion wear tests and quartz sand sliding-wear tests.The HD400 had the worst wear-resistance performance in dry sliding-wear tests,two-body and three-body quartz sand abrasion wear tests,but it had the best wear-resistance performance in two-body gangue abrasion wear tests and three-body coal power abrasion wear tests.In impact abrasion wear tests,mass loss of three steels changed with changing of impact energy.It is decreased with the increasing impact energy.Between 1 J and 2 J,medium manganese steel had the best wear-resistance performance,at the same time,HD400 had the worst wear-resistance performance.Between 2.5 J and 4 J,Mn13 had the worst wear-resistance performance and mass loss of medium manganese and HD400 were close.Wear mechanisms of three wear-resistance steels are mainly adhesive abrasive and fatigue abrasive.But with the increasing of load,the wear mechanism changed from adhesive abrasive and fatigue abrasive to oxidization abrasive.In quartz sand sliding-wear tests,two-body wear tests,three-body wear tests and impact abrasive tests,wear mechanism of these three wear-resistance steels is abrasive wear.The movement of abrasion effected the worn surface failure mechanism of three steels.In sliding wear tests,it was plough when the abrasion was sliding between samples,and it was cut when the abrasion was rolling between samples.In two-body abrasion wear tests,the worn surface failure mechanism of three steels was cut when the move direction of abrasion perpendicular to the worn surface,and it was plough when the move direction of abrasion parallel to the worn surface.Medium manganese steel and Mn13 both had the work-hardening performance,especially in high load sliding-wear tests and high impact energy impact abrasive tests.In same experiment conditions,the work-hardening performance of medium manganese steel was better than Mn13.Work-hardening mechanism of medium manganese steel which under 1 J impact energy was ?-marstenite transformation and high density of dislocations.When impact energy increased to 4 J,volume of?-marstenite was increasing.Work-hardening mechanism of Mn13 was high density dislocations,twins and stacking fault.When impact energy increased to 4 J,work-hardening mechanism of Mn13 was ?-marstenite transformation and dislocations tangled to islands and cells.