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Carburization technique of heat treatment for high temperature carburized steel (H10CrMo4Ni4V)

A high-temperature carburizing and carburizing technology, which is applied in the field of heat treatment and carburizing of high-temperature carburizing steel H10Cr4Mo4Ni4V, can solve the problems of affecting the dissolved amount of carbon element, which cannot be eliminated, and affecting fracture toughness, etc.

Inactive Publication Date: 2007-11-14
LUOYANG BEARING GROUP
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

The process of carburizing steel for ordinary military bearings is adopted, that is, the carburizing temperature is 930 °C, the carbon potential value is 1.2% in the strong infiltration period, and the carbon potential value is 0.9% in the diffusion period. The main problem of carburizing according to this process is carburization Severe network carbides appear in the layer. After the network carbides are formed, they cannot be eliminated at all.
After analysis, it is believed that H10Cr4Mo4Ni4V contains more Mo and V alloy elements, which affects the dissolution of carbon elements in austenite, so that the same carbon potential is easy to form network carbides and coarse carbides, which seriously affects fracture toughness.

Method used

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  • Carburization technique of heat treatment for high temperature carburized steel (H10CrMo4Ni4V)
  • Carburization technique of heat treatment for high temperature carburized steel (H10CrMo4Ni4V)

Examples

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Effect test

Embodiment 1

[0026] This example deals with high-temperature carburizing steel H10Cr4Mo4Ni4V with a carburizing layer depth of 1.2mm. The carburizing process parameters are: carburizing temperature in the strong carburizing period: 920°C, carbon potential: 0.7%, time: 8h; carburizing in the diffusion period Temperature: 945°C, carbon potential: 0.6%, time: 5h.

[0027] The high-temperature carburizing steel H10Cr4Mo4Ni4V processed according to the above process parameters is carburized for 13 hours, and the depth of the carburized layer is 1.2mm. There is no coarse carbide or network carbide on the surface, and the carbon concentration and strength are reasonable, so the product has a better carburized layer. Organization, surface carbon concentration and carbon concentration gradient.

Embodiment 2

[0029] This example deals with high-temperature carburizing steel H10Cr4Mo4Ni4V with a depth of carburizing layer of 1.4mm. The carburizing process parameters are: carburizing temperature in the strong carburizing period: 920°C, carbon potential: 0.7%, time: 10h; carburizing in the diffusion period Temperature: 945°C, carbon potential: 0.6%, time: 6h.

[0030] The high-temperature carburizing steel H10Cr4Mo4Ni4V treated according to the above process parameters is carburized for 16 hours. After carburizing, the depth of carburizing layer is 1.4mm, and the surface has neither coarse carbide nor network carbide. The carbon concentration and strength are reasonable, so the product has a better carburizing layer. Organization, surface carbon concentration and carbon concentration gradient.

Embodiment 3

[0032] This example deals with high-temperature carburizing steel H10Cr4Mo4Ni4V with a depth of carburizing layer of 1.6mm. The carburizing process parameters are: carburizing temperature in the strong carburizing period: 920°C, carbon potential: 0.7%, time: 14h; carburizing in the diffusion period Temperature: 945°C, carbon potential: 0.55%, time: 8h.

[0033] The high-temperature carburizing steel H10Cr4Mo4Ni4V processed according to the above process parameters is carburized for 22 hours. After carburizing, the carburizing layer depth is 1.6mm, and the surface has no coarse carbides or network carbides. The carbon concentration and strength are reasonable, so the product has a better carburizing layer. Organization, surface carbon concentration and carbon concentration gradient.

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Abstract

A thermal carburizing technology for the hgh-temp carburized steel (H10Cr4Mo4Ni4V) features that its technological parameters are 910-930 deg.C for strong carburizing phase, 930-950 deg.C for diffusing phase, 0.5-0.7% for carbon potential, and carburizing time h determined by an aquation.

Description

technical field [0001] The invention belongs to the technical field of heat treatment process, and mainly relates to a heat treatment carburizing process of high-temperature carburizing steel H10Cr4Mo4Ni4V. Background technique [0002] With the rapid development of the aviation industry, higher requirements are put forward for the performance of jet engine main shaft bearings. In addition to requiring high operating speed, high fracture toughness and high contact fatigue life (more than 900 hours), it is also required It has high high-temperature hardness to ensure that the jet engine will not suddenly fail due to brittle fracture of the bearing during the working process. [0003] It is well known that the toughness of fully hardened steel is low. Therefore, the research on using a high-temperature carburized bearing steel with high fracture toughness to manufacture engine main shaft bearings is an urgent problem to be solved. In addition to toughness and high contact fat...

Claims

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Application Information

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IPC IPC(8): C23C8/22
Inventor 关力龚建勋孙伟陈卉珍刘宏宇魏海潮王珂张玲
Owner LUOYANG BEARING GROUP
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