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Microstructure control method for high toughness bearings and steel for nano-bainite bearings

A nano-bainite, bearing steel technology, applied in the field of bearing manufacturing, can solve the problems of increased manufacturing cost, reduced bearing manufacturing efficiency, long carburizing cycle, etc., so as to overcome the long carburizing cycle, reduce bearing manufacturing cost, improve The effect of bearing manufacturing efficiency

Active Publication Date: 2020-07-03
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, carburizing heat treatment has a long carburizing cycle and high energy consumption, which not only reduces the bearing manufacturing efficiency, pollutes the environment, but also greatly increases the manufacturing cost

Method used

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  • Microstructure control method for high toughness bearings and steel for nano-bainite bearings
  • Microstructure control method for high toughness bearings and steel for nano-bainite bearings
  • Microstructure control method for high toughness bearings and steel for nano-bainite bearings

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Embodiment 1

[0030] This embodiment provides a high-toughness nano-bainite steel for bearings. The core of the bearing steel is nano-bainite structure, and the surface layer is a mixed structure including high-carbon martensite structure.

[0031] Specifically, the core of the bearing steel is a complete nano-bainite structure. The size of the nanobainite structure is 30 nm to 80 nm. In this embodiment, the size of the nano-bainite structure may specifically be 50nm-70nm, so that the toughness of the steel core for bearings is further improved.

[0032] The surface layer of steel for bearings is a mixed structure including a high-carbon martensitic structure. Specifically, the surface layer of the bearing steel is a mixed structure composed of high carbon martensite and retained austenite. Wherein, in the mixed structure, the volume fraction of the high-carbon martensite structure is greater than 80%, and in this embodiment, the volume fraction of the high-carbon martensite structure can...

Embodiment 2

[0039] This embodiment provides a tissue regulation method for high-toughness bearings, including:

[0040] Step S1, providing the initial bearing steel, the chemical composition of the initial bearing steel includes: C: 0.70-0.75, Si: 1.50-2.90, Mn: 0.60-0.80, Cr: 0.60-1.60, Ni: 0-0.30 in terms of mass percentage , Mo: 0~0.40, S: ≦0.010, P: ≦0.015, O: ≦0.0008, Ti: ≦0.003, H: ≦0.00015, and the rest are Fe and unavoidable impurities.

[0041] In this embodiment, the initial bearing steel material may be a steel ingot for processing into a bearing. Specifically, in terms of mass percentage, the chemical composition of the initial bearing steel includes: C: 0.73, Si: 2.20, Mn: 0.70, Cr: 1.42, Ni: 0.20, Mo: 0.30, S: 0.005, P: 0.007, O: 0.0004, Ti: 0.002, H: 0.00008, and the rest are Fe and unavoidable impurities.

[0042] Moreover, in this embodiment, annealing treatment such as spheroidizing annealing, soft annealing, etc. may also be performed on the initial bearing steel mate...

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Abstract

The invention discloses a structure adjusting and control method of a high-toughness bearing. The structure adjusting and control method of the high-toughness bearing includes the steps that S1, initial bearing steel is provided; S2, a bearing part is formed by machining forming of the initial bearing steel; S3, first heat treatment is conducted on the bearing part, and an integral structure of the bearing part is transformed into a nano bainite structure; and S4, second heat treatment is conducted on the bearing part, a mixed structure including a high-carbon martensitic structure is formed on the rollaway nest surface layer of an inner ring of the bearing and the rollaway nest surface layer of an outer ring of the bearing, and the volume fraction of the high-carbon martensitic structurein the mixed structure is greater than 80%. The invention further provides steel for the nano bainite bearing. A carburizing treatment method is not needed, the core part of the steel for the bearingis of the nano bainite structure, and toughness reaches the toughness of a carburized bearing core part; and the surface layer of the steel for the bearing is of the mixed structure including the high-carbon martensitic structure, wherein the volume fraction of the high-carbon martensitic structure is greater than 80%, and hardness of the steel for the bearing reaches the hardness of the surface layer of a carburized bearing.

Description

technical field [0001] The invention relates to the field of bearing manufacturing, in particular to the field of manufacturing and processing of high-toughness nano-bainite bearings, in particular to a method for regulating the structure of high-toughness bearings and the obtained steel for nano-bainite bearings. Background technique [0002] At present, the largest amount of bearing steel is high-carbon chromium bearing steel, and its consumption reaches more than 80% of the overall bearing steel market. However, the toughness of this high-carbon chromium bearing steel is relatively low after martensitic treatment, and the manufactured bearings are not suitable for working conditions with relatively large impact loads. In the case of heavy impact load, carburized steel bearings are usually used to ensure the performance. [0003] The most commonly used carburized bearing steel is G20Cr2Ni4A steel. After carburizing, after martensitic quenching and tempering, the core is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C21D9/40C21D9/36C21D1/42
CPCC21D1/42C21D9/36C21D9/40C21D2211/002C21D2211/008C22C38/02C22C38/04C22C38/44Y02P10/25
Inventor 杨志南张福成赵佳莉张明刘长波郑春雷尤蕾蕾李艳国
Owner YANSHAN UNIV
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