| High manganese steel both has good toughness and wear resistance,and it is one of the common materials for making ball mill linings.Because of the development trend of large-scale ball mill,for the lining material mechanical properties and service life raised higher and higher requirements,the development of long life high manganese steel liner with excellent mechanical properties has important engineering application value.This paper designed three different components of high manganese steel,three different heat treatments were carried out,the microstructures,hardness and impact toughness of different kinds of high manganese steel after three kinds of heat treatment were compared and analyzed.Optimize the best composition and the best heat treatment process,and the abrasive wear performance of the optimized sample was tested,the wear mechanism was also analyzed,The main research work of the paper is as follows:Three kinds of high manganese steel samples were treated with water toughness at 1100 ? for 4h in this paper,the samples were then subjected to XRD analysis,the results show that the matrix of the three high manganese steel samples is austenite,while containing a small amount of M23C6 phase,indicating that the carbides are not completely solidified into the austenite matrix.The hardness and impact toughness tests were carried out on the specimens,the test results show that the hardness of 1#and 3#high manganese steel is similar,the hardness and impact toughness of 2#high manganese steel is the lowest,the reason is due to the formation of ferrite,which caused the mechanical properties of 2#high manganese steel to decrease.Three kinds of aging treatments were carried out on three kinds of high manganese steel samples after water toughness treatment,the microstructures and properties of the sample after aging treatment were analyzed and tested.The results show that the number of precipitated carbides in the three high manganese steel samples increases with the increase of the aging temperature.For 1#and 2#samples,an increase in the aging temperature results in a significant increase in the amount of carbides precipitated at the grain boundaries,significantly reducing its impact toughness.For the 3#sample,as the aging temperature increases,the increase in carbide precipitation at the grain boundary is not significant,the mechanical properties of the 3#sample after the three treatments are optimal.Using ZGMnl3 as a comparison sample,the abrasive wear properties of the 3#sample after the thrid program treatment were tested under four different abrasive wear test conditions(different impact work).The results show that the wear resistance of the 3#sample under four different test conditions is better than that of ZGMnl3.3#samples and ZGMn13 wear resistance are closely related with the impact energy,under the high impact energy(5J),both materials have the best wear resistance;Under the low impact energy(2J),the wear resistance of both materials are slightly decreased;Under the middle impact energy(3J,4J),the wear resistance were significantly reduced.The surface of the sample after wear was observed using SEM,the wear mechanism of the high manganese steel specimen under the condition of abrasive abrasive wear is mainly micro-cutting,chisel deformation and fatigue peeling wear,and the change of impact energy will lead to the change of wear mechanism.In the case of low impact energy(2J),the wear surface is mainly distributed with more furrow morphology,the wear mechanism is mainly micro-cutting;Under the middle impact energy(3J,4J),the wear surface is mainly distributed with chisel and furrow,the wear mechanism is mainly chisel deformation and micro-cutting.Under the high impact energy(5J),there are obvious fatigue flaking characteristics on the wear surface,and the wear mechanism is mainly fatigue wear. |
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