A wear-resistant roller sleeve of trapezoidal bainite-martensitic composite phase steel and its preparation method

Abstract

The invention discloses a ladderlike bainite-martensite duplex-phase steel abrasion-resistant roller sleeve and a preparation method thereof, and belongs to the technical field of metal material casting. According to the method, silicomanganese series casting alloy steel with different compositions is prepared through centrifugal pressure casting in a layered mode, an outer layer (1) is a high-hardness abrasion-resistant layer, an inner layer (2) is a ductile matrix layer, and ladderlike bainite-martensite duplex-phase structures are obtained through the inner layer and the outer layer after salt bath isothermal quenching heat treatment, so that different properties are obtained. According to the method, the material composition proportion of the inner layer and the outer layer is optimized, a reasonable centrifugal compound casting process is adopted, and the inner layer and the outer layer are made to obtain the ladderlike bainite-martensite duplex-phase structures with different contents through the simple isothermal quenching heat treatment mode. According to the roller sleeve, the hardness of the outer layer is 57-62 HRC, the impact toughness of the outer layer is 10-13 J / cm<2>, the hardness of the inner layer is 50-55 HRC, the impact toughness of the inner layer is 19-21 J / cm<2>, and the high-quality abrasion-resistant roller sleeve with the high abrasion resistance, good toughness and the low cost is obtained.

Description

technical field [0001] The invention relates to a wear-resistant roller sleeve of ladder-shaped bainite-martensite composite steel and a preparation method thereof, belonging to the technical field of metal material casting. Background technique [0002] Vertical mill, Raymond mill and other aggregate crushing and grinding equipment are widely used in cement, electric power, coal and other industrial fields. As the main functional part of these equipment, the working performance of the grinding roller sleeve directly restricts the working efficiency of the whole equipment. Due to working under severe wear conditions, strict requirements are put forward for the anti-wear performance of the grinding roller sleeve, especially the surface of the roll sleeve is directly subjected to high-intensity wear and alternating strong pressure, so the existing roll sleeve The composite structure is mostly used, and the surface layer of the roller sleeve is strengthened with high wear-resi...

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Problems solved by technology

However, in this way, due to the stress between the base material and the surface reinforcement material during surfacing, and the difference in elastic modulus between the two materials during the working process, continuous work will cause alternating stress at the interface. , under the joint action of the two stresses, the strengthening layer on the surface is prone to fall off, which affects normal production

Another forming method is to carry out centrifugal compounding of materials such as high-wear-resistant high-chromium cast iron and carbon steel. First, the wear-resistant layer of the outer ring is cast, and then the matrix layer of the inner ring is cast. Considering the difference in thermophysical properties and mechanical properties of two different materials, the heat treatment process is often more complicated, and it is easy to generate large stress at the interface of the two materials during the working process.

In addition, the materials selected for the composite strengthening layer of these two composite methods have a high content of alloy elements, which increases the production cost of the composite roller sleeve

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