Study On Microstructure And Properties Of Novel High-manganese Steel Liner

The ball grinding mill is presently the main grinding equipment in the mining industry,where the liner is the main consumable part and the high-manganese steel is usually chosenas the liner material. Because of its better wear resistance, the high-manganese steel iswidely used in the metallurgy and mining equipment, building material, railway fork as wellas industrial grinding and crushing equipment. However, as the operating environment ofball grinding mill becomes much harsher, the common high-manganese steel can not meetthe higher performance requirement. In fact, the work hardening effect can occur only whenthe high manganese steel is subjected to the sufficiently high impact load. When the impactload is lower, the work hardening effect is not sufficient, and the surface shear failure for thehigh-manganese steel is easy to occur under the impact and cutting action of abrasivepowder, which will affect the wear resistance of high manganese steel. In this dissertation,both alloying and subsequent aging treatment were performed for the ZGMn13, and theinfluence of alloying elements and low temperature aging treatment on the microstructure,mechanical properties and impact wear performance of both ZGMn13Mo andZGMn13MoCrTiRE steels were studied, in order to provide the theoretical basis for thedevelopment and further engineering application of novel high-manganese steel.The experimental results reveal that after the aging treatment, the carbides precipitate inthe ZGMn13Mo and ZGMn13MoCrTiRE steels. At the aging temperature of350°C, thecarbides in two high-manganese steels are spherical, and exhibit the dispersed distribution.The grain size of ZGMn13MoCrTiRE steel is smaller and more uniform than that ofZGMn13Mo steel, and the carbide in the ZGMn13MoCrTiRE steel is finer and moredispersed. Meanwhile, the mechanical properties of two high-manganese steels get improvedafter the aging treatment. And the mechanical properties of ZGMn13MoCrTiRE steel arehigher than ZGMn13Mo, where the ultimate tensile strength of ZGMn13MoCrTiRE steel is1004.14MPa, its yield strength is647.32MPa, its elongation to failure is51.64%and itsimpact toughness is170.69J/cm2. The similar behavior in the wear resistance is also noted,where at the aging temperature of350°C, the wear amount of ZGMn13MoCrTiRE steel isonly0.24g and the ZGMn13MoCrTiRE steel exhibits better wear resistance than the ZGMn13Mo steel.