| In the fields of cement,metal mining,metallurgy,energy,chemical industry,railway and many other fields,a large number of wear-resistant materials are needed and consumed.Under the condition of serious chipping and large impact stress,high manganese steel is a prominent wear resistant material.Such as crusher hammers,semi(semi)self grinding liners,excavator shovels and other easy wearing parts With the continuous development of science and technology,the field of wear-resistant materials in the field of demanding for high manganese steel is becoming more and more stringent.In metallurgy,metal mines and other industries,large equipment has emerged,such as ore dressing,chipping and mining of large equipment,its anti-wear parts can reach up to ten tons,and the effective thickness is usually more than 100 millimeters.Wear resistance of wear-resistant parts is becoming more and more serious.The traditional high manganese steel is difficult to meet the daily needs in terms of production technology and performance requirements.Ultra high manganese steel has become an alternative to the traditional high manganese steel and meets the large-scale wear resistance.It has excellent wear resistance under high stress and high impact conditions.The ultra-high manganese steel has higher Austenite Stability and water solubility treatment ability than traditional high manganese steel,faster processing speed and better wear resistance.Three kinds of ultra-high manganese steel with different vanadium content were designed by using the role of vanadium in the steel,and five heat treatment processes with different aging temperatures were worked out to study the change law of vanadium content and aging temperature on the microstructure and properties of the alloyed ultra high manganese steelWhen the vanadium content is 0.1%～0.3%,increasing the content of vanadium can increase the grain boundary force and increase the resistance of grain movement,so that the austenite grain refinement can be made by the water hardening treatment and aging treatment of ultra-high manganese steel.The increase of vanadium content will increase the number of carbides.With the increase of vanadium content,the mechanical properties of ultra high manganese steel such as hardness,impact toughness and strength will be improved.When the vanadium content is 0.3%,the strengthening effect is the bestWhen aging temperature is 400～600℃,the number of carbides increases with the increase of aging temperature,and the force of carbide pinning grain boundary is increased,but the pinning force is smaller than that of grain growth driving force Therefore,the austenite grain of Superhigh Manganese steel increases gradually.At 400～450℃,with the increase of aging temperature,carbides gradually increase,most of them are in the grains,and a small amount is located at the austenite grain boundaries.At 500～600℃,the carbide gradually grows out of the grain boundary at 500℃ degrees centigrade.At 600℃ degrees,carbides are found in the grain boundaries and a small amount exists in the grains.Therefore,the hardness increases gradually,and the impact toughness increases first and then decreases.The yield strength,tensile strength and elongation at break increase first and then decrease The aging temperature is 450℃ degrees,the mechanical properties are the best,and the initial hardness is 230HBW.Impact toughness 91.2J/cm 2,yield strength 546MPa,tensile strength 688MPa,elongation after fracture 28.5%,compared with other temperature wear resistance is the highest,the largest micro hardness 519HV,hardened layer depth of about 1.5mm. |
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