Railway vehicle wheel and heat treatment method thereof

Abstract

The invention discloses a railway vehicle wheel heat treatment method and a railway vehicle wheel formed through the method. The railway vehicle wheel heat treatment method includes the following steps that firstly, the wheel is integrally heated and subjected to complete austenitizing; secondly, constant-pressure and small-flow spray water is used for conducting short-time cooling on the tread of the wheel; and thirdly, continuous and controllable water volume stepped spray water is used for conducting quenching on the tread of the wheel, a balanced cooling speed is formed below the tread of the wheel, and therefore a balanced fine pearlite structure is obtained in a rim area of the whole wheel. According to the railway vehicle wheel heat treatment method and the railway vehicle wheel formed through the method, small flow under relatively high water pressure is used for eliminating a film boiling stage or shortening the film boiling stage, meanwhile, the phenomenon that bainite is formed due to the relatively high cooling speed is avoided, afterwards, continuous and controllable water volume stepped spray water is adopted for quenching, the balanced cooling speed is formed under the tread of the wheel, the balanced fine pearlite structure is obtained in the whole rim area, and therefore the balanced mechanical performance is obtained, relatively high hardness and plasticity are achieved, and the hardness gradient in the wheel abrasion direction is reduced.

Description

technical field [0001] The present invention relates generally to railway vehicle wheels and, in particular, to a method of heat treating railway vehicle wheels. Background technique [0002] Railway vehicle wheels are generally produced by casting or forging, followed by heat treatment. The wheel 1 type is usually as follows figure 1 As shown, the weight of the wheel 1 is generally about 500KG, and the material is carbon steel. The part of the wheel 1 in contact with the track is the rim 11 , and the contact surface is the tread 12 . [0003] For a long time, the main heat treatment method of railway wheel 1 is to heat the whole wheel 1 to austenitize, and then spray water to cool and quench the tread surface 12. This heat treatment method requires quenching in the wheel rim 11 area to obtain excellent fine pearlite structure and very Important compressive stress, while normalizing treatment is achieved on the web and hub to obtain better toughness. [0004] However, in r...

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Problems solved by technology

[0004] However, in recent years, with the needs of heavy-duty railway transportation, the requirements for the hardness, wear resistance and load capacity of the wheel 1 are getting higher and higher, and the carbon content of the wheel 1 is getting higher and higher. Quenching with water is difficult to avoid the formation of bainite on the surface of the wheel, which makes the wheel structure brittle and reduces service performance

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