Research On The Effect Of Impact Energy To The Impact Abrasion Properties And Mechanisms Of The Wet Mill Liner Materials Used In The Corrosive Condition

The consumption of liners and grinding balls are the most serious in wear resistant metal materials, they make giant economic losses every year, so how to reduce this kind of losses is an important subject. In this background, the low carbon high alloy steel is developed. However, in order to make it have the excellent properties when used in the actual service conditions, its wear mechanisms must be researched. This is the main problem that will be researched in this study.In this study, the design theory of the low carbon high alloy steel was introduced at first, and then the laboratory test conditions of materials were defined according to the actual service conditions, at last, tested the corrosive impact wear properties of the low carbon high alloy steels with a modified MLD-10 wear tester in the simulated condition, and for comparison, the high manganese steel was also tested in the same conditions. The results show that the low carbon high alloy steel has the better corrosive impact wear resistance compared with the high manganese steel in the same conditions, and it is a kind of excellent wet-grinding liner steel.At last the worn surfaces of the low carbon high alloy steel and high manganese steel were studied by Sirion-200 FEG SEM(Scanning Electronic Microscope) in this paper, and the subsurface microstructures and subsurface microhardness of the two steels were analyzed through Olympus optical microscope and microhardness instrument, finally we definitely discussed the wear mechanism of the two steels. The results show that the impact energy has great influence on the corrosive impact abrasion properties and wear mechanisms of the two steels. In the simulated condition: when the impact energy is 0.7J, the corrosive impact abrasion wear mechanism of low carbon high alloy steel is slight micro-cutting, the corrosive impact abrasion wear mechanism of high manganese steel is micro-plough and secondary micro-cutting. When the impact energy is 1.2J, the corrosive impact abrasion wear mechanism of low carbon high alloy steel is slight micro- plough and secondary micro-cutting, the corrosive impact abrasion wear mechanism of high manganese steel is micro- plough and secondary micro-cutting during the short time, with the increasing of time, the wear mechanism changed to low cycle fatigue fracture of extruded hardened edge. When the impact energyis 1.7J, the corrosive impact abrasion wear mechanism of low carbon high alloy steel is the low cycle fatigue fracture of extruded hardened edge during the short time, there are a small amount fatigue flake of the work-hardening layer and slight corrosive wear after long test time, the corrosive impact abrasion wear mechanism of high manganese steel main is the low cycle fatigue fracture of extruded hardened edge and slight corrosive wear during the short time, the wear mechanism is low cycle fatigue fracture of extruded hardened edge, fatigue flake of the work-hardening layer and corrosive wear after long test time.