Investigation Of Wear Resistance Of Medium Manganese Steel And Forgeability Of High Manganese Steel

Medium manganese steel and high manganese steel were selected to be experimental material in this study. The effect of W on the mechanical properties and wear resistance of medium manganese steel has been investigated. The mechanism of W influencing the microstructure,element's distribution, mechanical properties and wear resistance of medium manganese steel has been studied. Two kinds of high manganese steel with different P content has been investigated, the effect of P on the thermoplasticity of high manganese steel has been studied.The wear resistance of medium manganese steel with different W content was tested on MM-200. Worn surface of steel after abrasive experiment was studied by using scanning electron microscope(SEM).Transmission electron microscope (TEM) and metallographical microscope were used in the steel's microstructure analysis. Element's linear distribution was studied by using field emission transmission electron microscope. Gleeble-3500 was used to analyze the thermoplasticity of high manganese steel at different temperatures. Element's linear distribution of high manganese steel near grain boundary was analyzed by using X-ray energy dispersive spectrameter equiped with scanning electron microscope(SEM).The results show that, tungsten changed the distribution of carbon in medium manganese steel and enhanced the wear resistance and mechanical properties of medium manganese steel obviously. Comparing with the medium manganese steel without tungsten, the toughness of as quenched medium manganese steel with 1.5%W increased by 40%, the tensile strength increased by 10%, and the wear resistance increased by 40%, the wear resistance of as-cast medium manganese steel increased by 50%. SoW-added mode medium manganese steel can be used in as-cast condition. Fracture ofthe steel become ductile fracture from quasi-cleavage fracture.High phosphorous content is the main reason for high manganese steel's poor forgeability. Phosphorous reduced the forging temperature range and deteriorated the thermoplasticity of high manganese steel. Phosphorous was prone to segregate near grain boundaries and form iron phosphide eutectic, so the forgeability of high manganese steel is bad.