Wear-resistant high-manganese steel based on TWIP effect and nano precipitation strengthening and preparation method and application of wear-resistant high-manganese steel

Abstract

The invention discloses wear-resistant high-manganese steel based on a TWIP effect and nano precipitation strengthening. The wear-resistant high-manganese steel comprises the following chemical element components in percentage by mass: 1.2%-1.6% of C, 18%-26% of Mn, 1.0%-2.0% of Mo, 0.3%-1.2% of V, 0.04%-0.08% of Nb, 0.3%-0.5% of Si, less than or equal to 0.003% of P, less than or equal to 0.005% of S and the balance of Fe and other inevitable impurities, wherein the microstructure of the wear-resistant high-manganese steel is austenite. The stacking fault energy is controlled within the range of 20-40 mJ / m<2>, so that a liner plate generates the TWIP effect, generates twin crystals and improves the wear resistance in the production and use process, the TRIP effect can be avoided, and strain-induced martensite cannot be generated, so that the surface of the liner plate is prevented from being deformed and scrapped, and the purposes of prolonging the service life and reducing the production cost of a mine are achieved.

Description

technical field [0001] The invention belongs to the technical field of high manganese steel preparation, and in particular relates to a wear-resistant high manganese steel based on TWIP effect and nano-precipitation strengthening and a preparation method thereof. Background technique [0002] Austenitic manganese steel plays a dominant role in wear-resistant parts. The reason is that austenitic manganese steel has excellent impact toughness and excellent work hardening performance. Under the premise of not causing fracture failure, the surface is impacted and produced work hardening. , to obtain the performance characteristics of hard surface and tough core, so large-scale crushing equipment generally uses ultra-high manganese steel as wear-resistant accessories for impact and wear. [0003] However, due to the low original hardness of traditional high manganese steel, it relies on martensitic transformation to improve the surface hardness of high manganese steel and improve...

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Problems solved by technology

[0003] However, due to the low original hardness of traditional high manganese steel, it relies on martensitic transformation to improve the surface hardness of high manganese steel and improve wear resistance, which will have the following problems: (1) The yield strength is generally around 340MPa, which cannot meet the requirements of engineering components. Under high stress performance requirements, severe plastic deformation will occur, which will lead to failure in the early stage of the service process and affect the service life; (2) TRIP effect will occur after the surface of the material is impacted, and deformed martensite will be generated on the working surface of the wear-resistant parts. Cause volume expansion on the working surface, produce stress difference in different areas of the workpiece, and cause deformation of the workpiece due to stress; 3) High manganese steel is austenite structure after water toughening treatment, with low initial hardness (HB180-220), resistance The ability of abrasive wear is not strong. When used in the working condition of high hardness abrasive and small impact stress, the wear resistance of abrasive wear cannot be fully exerted.

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