The Effect Of Aging Treatment On The Microstructure And Mechanical Properties Of Mn13 Type Lining Board Of Ball Mill

Ball mill is widely used in grinding equipment of mining machinery. Lining board is the wearing part and it’s market demand is large. The material of the lining board mainly adopts high manganese steel. The high manganese steel as wear resistant material is widely used in railway road forks, mining equipment, building materials, grinding and crushing equipment etc. With the increasing production of the ball mill, the lining board requires more higher wear resistance. The traditional high manganese steel is unable to meet the requirements of the working conditions. After water toughening treatment, the microstructure of the high manganese steel is completely austenite. Under the impact loading condition, according to the effect of dislocation pile-up, transformation strengthening and deformation twins strengthening, the impacting surface of the high manganese steel will produce work hardening and therefore have good abrasion resistance. However, the work hardening effect of the high manganese steel will not occur until under high impact loading.In this paper, through the microalloying effect of adding alloy elements such as Cr, Ti and modification effect of adding RE elements, in the meantime, aging treatment is carried on high manganese steel under the different temperature and different time. The effect of aging treatment process on microstructure, mechanical properties and impact wear properties of ZGMn13 MoCrTiRE is studied. The results show that the second phase of carbides precipitate in the ZGMn13 MoCrTiRE matrix after 350℃ × 2-5h aging treatment. After 4h aging treatment under 350℃, the fine and dispersion globular second phase precipitates in the grain of high manganese steel. Meanwhile, the mechanical properties and the wear resistance of high manganese are improved after the aging treatment. The tensile strength is 1036 Mpa which improves 9.7%. The yield strength is 657 Mpa which improves 10.7%. The elongation is 49.8% which reduces 17%. The impact toughness is 170.8J/cm2 which improves 13.6%.The wear amount is only 0.2g and the wear resistance improves 54.5%. Furthermore, through the microalloying effect and modification effect of RE elements, the mechanical properties and the wear resistance of high manganese are greatly improved.