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High-temperature bearing steel carbide fine dispersion treatment process

A high-temperature bearing and treatment technology, which is applied in the field of heat treatment of metal materials, can solve the problems of insufficient homogeneity and refinement of carbides in high-temperature bearing steel

Active Publication Date: 2022-05-10
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of insufficient homogenization and refinement of carbides in high temperature bearing steel

Method used

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  • High-temperature bearing steel carbide fine dispersion treatment process
  • High-temperature bearing steel carbide fine dispersion treatment process
  • High-temperature bearing steel carbide fine dispersion treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First, put the GCr4Mo4V vacuum consumable ingot of φ300mm×700mm size prepared by "vacuum induction + vacuum self-consumption" in the heating furnace, heat it to 1150°C, keep it for 15 hours, continue to heat it to 1190°C, keep it for 5 hours, and wait for it to come out of the furnace. After the temperature reaches 1100°C, the pier-drawing process is carried out. After pier-drawing, the size of the forged blank is 250mm×250mm×790mm; the pier-drawn forging billet is heated into a heating furnace at 1200°C, kept for 5 hours, and then released from the furnace. After the temperature reaches 1100°C, carry out drawing and forging; the size of the drawn forging blank is 100mm×100mm×4900mm, and the drawing and forging ratio is 6.25; heat the drawn forging blank into a heating furnace at 1200°C and keep it warm for 15 hours , then cool with the furnace to 1100°C, hold for 5 hours, then cool with the furnace to 1020°C, hold for 5 hours, then cool with the furnace to 800°C, hold f...

Embodiment 2

[0039] First, put the GCr4Mo4V vacuum consumable ingot of φ300mm×700mm size prepared by "vacuum induction + vacuum self-consumption" in the heating furnace and heat it to 1170°C, keep it for 24 hours, continue to heat it to 1200°C, keep it for 10 hours, and wait for it to come out of the furnace After the temperature reaches 1130°C, the pier-drawing process is carried out. After pier-drawing, the forging blank is a square-section billet with a size of 300mm×300mm×530mm; the pier-drawn forging billet is heated into a heating furnace at 1230°C, and kept for 10 hours. After the temperature reaches 1130°C, carry out drawing and forging; the size of the drawn forging billet is 100mm×100mm×4700mm, and the drawing and forging ratio is 9; heat the drawn forging billet into a heating furnace at 1230°C and keep it warm for 24 hours , then cool down to 1150°C with the furnace, hold for 10 hours, then cool with the furnace to 1050°C, hold for 10 hours, then cool with the furnace to 820°C, ...

Embodiment 3

[0042] First, put the GCr4Mo4V vacuum consumable ingot of φ300mm×700mm size prepared by "vacuum induction + vacuum self-consumption" smelting in the heating furnace, heat it to 1150°C, keep it for 20 hours, continue to heat it to 1190°C, keep it for 8 hours, and wait for it to come out of the furnace. After the temperature reaches 1100°C, the pier-drawing process is carried out. After pier-drawing, the forging blank is a square-section billet with a size of 250mm×250mm×790mm; the pier-drawn forging billet is heated into a heating furnace at 1200°C, and kept for 8 hours. After the temperature reaches 1100°C, carry out drawing and forging; the size of the drawn forging billet is 100mm×100mm×4900mm, and the drawing and forging ratio is 6.25; heat the drawn forging billet into a heating furnace at 1200°C and keep it warm for 20 hours , then cool down to 1100°C with the furnace, hold for 8 hours, then cool with the furnace to 1020°C, hold for 8 hours, then cool with the furnace to 8...

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Abstract

The invention discloses a high-temperature bearing steel carbide fine dispersion treatment process. The process comprises the working procedures of cast ingot two-section type pretreatment, cast ingot upsetting and drawing machining, forging stock primary heat treatment, forging stock drawing machining, forging stock secondary heat treatment and the like. According to the high-temperature bearing steel prepared through the technology, carbides are fine, dispersed and evenly distributed, the particle size of large-particle carbides ranges from 1.48 micrometers to 1.69 micrometers, the particle size of average carbides ranges from 1.37 micrometers to 1.66 micrometers, and after quenching and tempering treatment, the tensile strength of the high-temperature bearing steel ranges from 2790 MPa to 2872 MPa, the yield strength ranges from 2314 MPa to 2522 MPa, the ductility ranges from 3.14% to 3.82%, and the surface hardness ranges from 65.3 HRC to 65.8 HRC.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular relates to a high-temperature bearing steel carbide fine particle dispersion treatment process. Background technique [0002] Aeroengine, as the power device of aviation aircraft, not only represents the frontier of cutting-edge engineering technology, but also leads the development process of high-quality special steel. Aeroengine main shaft bearings need to withstand severe vibration stress, bending torque and harsh lubrication conditions under the condition of high temperature and high speed, and the cracking of the bearing will have catastrophic consequences for the integrity of the aeroengine. With the gradual development of aero-engines in the direction of high thrust-to-weight ratio, high reliability, high durability, low fuel consumption, and low cost, the working conditions of main shaft bearings, which are key components of aero-engines, have ...

Claims

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Application Information

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IPC IPC(8): C21D1/00C21D6/00C21D8/00C22C38/02C22C38/04C22C38/20C22C38/22C22C38/24C22C38/30C22C38/42C22C38/44C22C38/46C22C38/52
CPCC21D1/00C21D6/002C21D6/004C21D6/005C21D6/008C21D6/007C21D8/005C22C38/04C22C38/02C22C38/22C22C38/24C22C38/20C22C38/30C22C38/44C22C38/46C22C38/42C22C38/52
Inventor 张雲飞崔毅赵英利王艳樊明强吕达马娥
Owner HEBEI IRON AND STEEL
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