Axle steel crystalline grains ultra-fining electric pulse heating technology

A heating process and electric pulse technology, used in heat treatment furnaces, manufacturing tools, heat treatment equipment, etc., can solve the problems of reducing strength and toughness, thick and thick axles, etc., to eliminate band segregation and band structure, and achieve good uniformity. Effect

Inactive Publication Date: 2014-07-16
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following problems. First, the axle has a relatively coarse grain size when it is forged in the early stage, and subsequent heat treatment is prone to tissue inheritance, resulting in a coarse grain size after quenching and tempering heat treatment.
Second, the high temperature in the quenching and tempering heating process leads to the phenomenon of mixed crystals, which reduces the strength and toughness and poses a threat to the safety of train operation.
In addition, it is not easy to obtain uniform austenite grains by fluctuating heating near the critical point.
Therefore, the processing effect of the existing axle steel heat treatment heating process is still not ideal enough

Method used

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Embodiment Construction

[0016] Embodiments of the present invention: when low-medium-carbon and low-alloy axle steel parts are heated in a heat treatment process, the temperature is lower than and close to the critical point A c3 While heating it at a nearby temperature, electric pulse heating is used, and the heating time is controlled at 4mm / min according to the effective diameter of the part to obtain uniform ultra-fine austenite grains.

[0017] Above at below and close to the critical point A c3 The temperature range is A c3 ~A c3 In the range of -10°C, electric furnace heating and electric pulse heating are performed on low-medium-carbon and low-alloy axle steel parts at the same time. After the heating is completed, the traditional quenching-tempering process can be directly carried out.

[0018] When the low-medium-carbon and low-alloy axle steel parts are 25CrMoA axle steel materials, it is best to heat them with electric pulses in the range of 790°C to 800°C.

[0019] When performing ele...

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Abstract

The invention discloses an axle steel crystalline grains ultra-fining electric pulse heating technology, which comprises the steps of: electric pulse heating when heating a low and medium carbon low-alloy axle steel part with a heat treatment technology and heating at a temperature nearby a critical point Ac3, and controlling the heating time to be 4mm / min according to the effective diameter of the part to obtain even ultra-fining austenite crystalline grains. With the electric pulse heating technology, the axle steel part can obtain even austenite crystalline grains and has higher rigidity and intensity. Compared with the prior art, the technology not only has the advantages of ultra-small sizes of the part crystalline grains, no mixed crystal, and easily-obtained even austenite crystalline grains, but also has the advantages of being capable of effectively improving the obdurability, the rigidity and the intensity.

Description

technical field [0001] The invention relates to an electric pulse heating process for superfine grains of axle steel, belonging to the technical field of metal heat treatment. Background technique [0002] In recent years, with the speed increase of trains, new challenges have been put forward to the performance of locomotives, thus higher requirements have been put forward for the performance of train axles. It is required that the wheels and shafts should have sufficient strength and impact toughness to ensure absolute safety and reliability under the highest speed and load. Wheels and axles are vital components directly related to train safety for high-speed trains. Therefore, all countries in the world attach great importance to the research and development of materials and processes for wheels and shafts. At present, the heat treatment of axles mostly adopts the process route of quenching and tempering heat treatment plus surface strengthening treatment and heating by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/34C21D9/28
Inventor 梁益龙王筑生吴光英张春红王兴安梁宇
Owner GUIZHOU UNIV
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