Fabrication Of In Situ Particle Locally Reinforced Austenitic Manganese Steel Composites And Strengthening Of The Matrix

The development of modern industry demands the wear resistance of materialshigher and higher, many conditions require that the material also has high toughnessand high hardness, traditional wear resistant materials can not meet the requirementsabove. Therefore, the development of a new wear-resistant material is a problem to besolved.In this paper, the use of combustion assisted casting route, prepare preform by the(Ti, Fe)-C system, and join the high-carbon ferromanganese to the preform to ensurethat the matrix in the reinforced region is still middle manganese steel matrix after thereaction, placed in the cavity within the site to reinforce the casting when the hightemperature of molten steel cause the high temperature synthesis reaction of thesystem of prefabricated body powder, TiC in situ generated and parts cast forming ina complete, fabricate a large volume fraction of TiC locally reinforced of AusteniticManganese steel matrix composites.Local short-term gradient deep-cryogenic treatment of prepared composite,composite abrasion side of the instability Austenitic Manganese steel matrix turnsMartensitic Transformation, wear resistant side of the organization is TiC+A+M,which Martensitic’s generation supply strong support for TiC. Core toughness matrixzone is Austenitic, from the high toughness of the abrasion side to the shock side, theMartensite was gradient descent, resulting in one side of high hardness, wearresistance, while impact resistance, high toughness of the other side, intermediaryorganizations’ performance appear gradient changes which not only saves preciousmetal resources, but also meet the requirements of the material with high hardness andtoughness, hardness and toughness transition. Thus, by combustion assisted castingroute and liquid nitrogen deep-cryogenic treatment, we fabricate a new type ofgradient wear-resistant materials.The hardness and wear resistance of composite materials are also studied in thispaper. Hardness test of composite materials show that from the enhancement districtto the ductile matrix after the composite of the local short-term gradientdeep-cryogenic treatment, due to the gradient of the Martensite, the hardness slowlydeclining, the organization of the transition zone is not only a strong support to thereinforced region, but also play a very good connection role to enhance the area andthe matrix. The wear resistance test to different initial state of the composite matrixand enhancement area, the wear resistance of TiC reinforced Austenitic Manganesesteel matrix composite materials has been very increased than that of Water HighManganese steel, indicating that situ synthesis of TiC particle has a good resistance towear grits to invade the matrix and to bear the load and impede the matrixdeformation antiabrasion; under the low stress load, the wear resistance of Manganese steel substrate has been greatly improved than Water High Manganese steel; afterliquid nitrogen deep-cryogenic treatment reinforced region and the matrix theabrasion resistance of enhancement and the matrix has been improved, the surface ofthe liquid nitrogen cryogenic treatment can not only improve the support toenhancement body and fixed effects, but also to some extent, improve the surfacewear resistance.The in situ particle locally reinforced composite have been investigated, and thestrengthening of the matrix have also been preliminary discussed. The method used tostrengthen matrix is transformation strengthening and Electro-strengthening.According to Professor Zhao Yuguang’ Electro-strengthening Theory, we studied thepulse current to the impact of the initial form of organization in the manganese steelmatrix, respectively, Manganese steel in cast,Water Tough Manganese steel, Cast+cryogenic treatment Manganese steel, Water Tough+cryogenic treatment Manganesesteel through pulse current processing and found that pulse current handling can makea large number of carbide solid dissolve in the organization of the cast Manganesesteel reaching to the effect of water toughening treatment, and promote the newnucleation and re-crystallization refines its organizational, strength and toughness canbe improved; pulse current handling makes Martensite inverse shear in cryogenictreatment, forming smaller austenite, refining its organization, and improving thetoughness of the matrix. Matrix under different conditions have been strengthened.