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Heat treatment method of high-hardness and high-impact-toughness alloy material

A heat treatment method and technology of alloy materials, which are applied in the field of heat treatment of alloy materials with high hardness and high impact toughness, can solve the problems that it is difficult to meet the technical index requirements of high-quality hobs and the service life of hobs is not long, so as to achieve good toughness and prolong The effect of service life and high hardness

Inactive Publication Date: 2020-04-07
GUIZHOU UNIV
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  • Description
  • Claims
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Problems solved by technology

However, in these processes, the toughness and hardness of the material are not well combined, so it is difficult to meet the technical index requirements of high-quality hobs (hardness ≥ 56HRC, impact value ≥ 20J), which leads to the failure of the hob Not long service life

Method used

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  • Heat treatment method of high-hardness and high-impact-toughness alloy material

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Embodiment 1

[0024] Example 1. A heat treatment method for high-hardness and high-impact-toughness alloy materials. After austenitizing the material, it is put into quenching oil for quenching treatment; Put the material into water or oil at room temperature and cool down.

[0025] Specifically, the austenitizing treatment is: keeping the material at a holding temperature of 900-1000° C. for 30-60 minutes. This treatment not only ensures that the alloying elements in the material are fully dissolved, but also does not cause the grains to grow.

[0026] Specifically, the holding temperature during the austenitizing treatment is 950°C.

[0027] Specifically, the quenching treatment is: keeping the temperature in quenching oil at 50-150° C. for 15-40 seconds at a constant temperature. This treatment can partially transform the austenite in the material, so that the structure after the quenching treatment is quenched martensite + about 10% metastable austenite.

[0028] Specifically, the q...

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Abstract

The invention discloses a heat treatment method of a high-hardness and high-impact-toughness alloy material. The method comprises steps of austenitizing the material, and then putting the austenitizedmaterial into quenching oil for quenching treatment; after quenching treatment, putting the material into an isothermal molten salt bath medium for heat preservation and carrying out partition treatment; and putting the material into room-temperature water or oil for cooling treatment after distribution treatment to obtain the product. The impact toughness of the material can be improved while the hardness of the material is improved, and the service life of rolling can be effectively prolonged when the material is used for manufacturing the hobbing cutter of the shield tunneling machine.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment technology, in particular to a heat treatment method for alloy materials with high hardness and high impact toughness. Background technique [0002] The shield machine is more and more widely used in the construction of major projects such as urban subways, railways and highways, and energy transportation pipelines. Shield machine tunneling has the advantages of fast construction speed, high quality, low labor intensity, economy, and environmental protection. The hob in the shield machine is a component that directly contacts and acts on rocks and soil, which is equivalent to the teeth of the shield machine, and is an important structural component in the tunneling operation of the shield machine. Since the work of the shield machine tools is in the underground soil, rocks, and gravel accompanied by a humid environment, the service environment is relatively harsh, and its main failur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D1/78
CPCC21D1/78C21D6/002C21D6/005C21D6/007
Inventor 赵飞刘源彭承银
Owner GUIZHOU UNIV
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