Research On The Microstructure And Property Of ZGMn13 Steelby Modified SiC Nano-Powders

As wear resistant material, high manganese steel is superior to the other material in the aspect of abrasion or drilling wear under strong impact and great stress. But the initial hardness of high manganese steel was low and the deformation is large in impact loads, which made initial abrasion more serious and effect the service life of high-manganese steel.people have pay more attention to how to improve the strength of high manganese steel and the wear resistance of materials. High manganese steel reinforced by modified SiC nano-powders has been prepared under industrial conditions. The microstructure, mechanical properties and wear resistance of reinforced materials with SiC nano-powders were investigated, and the action mechanism was also discussed.The microstructure, wear resistance and mechanical properties of high manganese steel were used to measuring by metallographic examination, hardness test, tensile test, shot test, and electro-analysis, and the mechanical properties and wear resistance of reinforced materials with different SiC nano-powders contents were discussed. The results showed that: high manganese steel with the modified nano-SiC powders, cast austenite grain was refined and carbides have been distribution and after water the water treatment the size of austenite grain with SiC nano-powders is more smaller than that of the high manganese steel without it; the mechanic properties is markedly improved and the hardness, tensile strength and toughness are increased by 33%,8.2%,22%, respectively. In the fracture organization of high manganese steel, more dimples so the fracture behavior of reinforced was typical ductile fracture. In the MM-200 wear test machine wear test, the modified nano-SiC powders strengthened, when the wear time of 30min, load of 80N, the wear per component decreased by 11%,31%,26%, respectively. High manganese steel shot blasting experiments in the QPL testing machine, and surface hardness of high manganese steel after shot treated increased dramatically, with the increment of impact time, the hardness of the sample continued to increase and became stable at last. The hardening rate increased rapidly with modification of nano-SiC powders. The analysis of X diffraction of the samples after hardening showed that under shot peening conditions, the strengthening mechanism of high manganese steel had deformation twinning density and dislocation density but no Martensite strengthening.