Research Of TiC/TiN Steel Bonded Carbide And High Manganese Steel Jaw Plate Embedded Reinforcement Technology

TiC steel bonded carbide is a combination of high hardness of hard alloy andmachinability of steel, shows excellent comprehensive performance, its applicationfield is wide, hammer, roller and jaw crushing equipment that is commonly used inexpendable parts often through strengthening technology using this material. As theworking condition of broken is increasingly complex, the TiC of steel bonded carbidewear resistance and the service life of materials put forward higher requirements.This research studies the effect of the addition amount of TiN on the themicrostructure and mechanical properties of TiC/TiN steel bonded carbide, inlaid theoptimized steel bonded carbide which is modified to high manganese steel jaw plate,studied the parameters of cemented carbide, embedded technology and heat treatmentprocess.In this paper, microstructure observasion, Scanning electron microscope,rockwell hardness test, bending strength test, wear test and wear morphology analysiswere conducted to study the effects of TiN on microstructure and mechanicalproperties of TiC steel bonded carbide, the results show that:The interface between Hard phase and binder phase interface of TiC/TiN steelbonded carbide is clear, with the increase of the content of TiN, the number of smallparticles of TiC/TiN steel bonded carbide obviously increases, structure distributesmore uniformly, bonding phase distributes more continuously. With the increase ofthe content of TiN, hardness and bending strength climb up and then decline, mainlybecause the TiN particles at the grain boundaries and phase boundaries are diffuselydistributed, when material occurred to deformation, they can prevent the dislocationfrom moving, then raise the properties of TiC steel bonded carbide, but when the TiNamount over a certain range, will reduce the density of alloy and the alloy’smechanical properties. When the TiN content of3%, the sample has good mechanicalproperties, hardness:87.0HRA, bending strength:1160MPa. Observing wearmorphology by scanning electron microscopy, the wear resistance results showed that metal bonded phase of TiC/TiN steel bonded carbide, its wear mechanism is furrowsand micro-ploughing, when binding phase wears to a certain degree, hard phaseparticles begin to wear, When the TiN content of3%, wear resisitance is relativelygood.Optimization of TiC/TiN steel bonded carbide embedded high manganese steeljaw, the process shows that: preset the TiN content of3%of the conical rod TiC/TiNsteel bonded carbide within the sodium silicate sand, the volume of hard alloy withjaw teeth is about0.5~1.5:10, the pouring temperature is1450℃, The heat treatmentprocess of jaw plate matrix is water toughening treatment.After water toughening treatment, the structure of the high manganese steelmatrix is composed of austenite and a small amount of carbide, the size of austeniticgrain is small, the hardness of high manganese steel≥20HRC, tensile strength σb≥750MPa, yield strength σs≥450MPa, elongation delta δ≥25%, Ku2≥120J; Byscanning electron microscope, observing the combinative interface of hard alloy andhigh manganese steel matrix, the way of combinative interface is the mechanicalcombination, the grain of high manganese steel is small at the combinative interface.TiC/TiN steel bonded carbide can be set on the high manganese steel jaw plate,give full play to the high abrasion resistance of hard alloy and the high toughness ofmatrix, compared with ordinary jaw, it has longer service life, has a certain economicbenefits.