Thermal treatment method of nano-bainite bearing and bearing manufactured by adopting thermal treatment method

A technology of nano-bainite and heat treatment method, applied in the field of bearing manufacturing, can solve problems such as environmental pollution and high cost

Active Publication Date: 2019-07-23
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this salt bath equipment is expensive an

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  • Thermal treatment method of nano-bainite bearing and bearing manufactured by adopting thermal treatment method
  • Thermal treatment method of nano-bainite bearing and bearing manufactured by adopting thermal treatment method

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Example

[0048] Example 1: Using a high-carbon chromium nano-bainite bearing steel, the main chemical composition mass percentages are, C: 0.92, Si: 1.51, Mn: 0.45, Cr: 1.42, Mo: 0.20. After the bearing steel is spheroidized and annealed, it is processed into bearing parts with a wall thickness of 40mm. Then heat the bearing parts to 830°C for 40 minutes, put them in 70°C warm water for 10 seconds and then take them out. After standing for 65 seconds, add water again and cool for 6 seconds. After the surface temperature reaches 135°C, put the bearing ring into 200°C inert Isothermal treatment is carried out in an atmosphere furnace. After holding for 3.5 hours, the bainite formation content reaches 50%. It is taken out and cooled, and finally it is held in a furnace at 175°C for 1 hour for tempering. After this method, the surface hardness of the bearing ring is 62.5HRC, the core hardness is 58.6HRC, and the unnotched impact toughness is 68J / cm. 2 .

Example

[0049] Example 2: Using a carburized nano-bainite bearing, the main chemical composition mass percentages are: C: 0.23, Si: 1.46, Mn: 0.62, Cr: 1.56, Ni: 0.59, Mo: 0.25. The bearing steel is processed into bearing parts, and the wall thickness of the bearing ring is 85mm. Then carburizing treatment is carried out, and the C content on the surface after carburizing reaches 0.95 wt.%. The carburized bearing parts are spheroidized and tempered at high temperature. Then heat the bearing parts to 865°C for 60 minutes, put them in 50°C warm water for 25s, then take them out, let stand for 100s and then add water to cool for 10s, the surface temperature reaches 155°C, put the bearing ring into 185°C inert Isothermal treatment is carried out in an atmosphere furnace. After holding for 7.5 hours, the amount of bainite produced reaches 65%, then it is taken out and cooled, and finally it is held in a furnace at 180°C for 1 hour for tempering. After being processed by this method, the s...

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Abstract

The invention discloses a thermal treatment method of a nano-bainite bearing. The method comprises the following steps: carrying out austenitizing treatment on to-be-processed bearing parts; cooling the surfaces of the to-be-processed bearing parts to reach a first temperature in a manner of water bath; and carrying out isothermal treatment on the to-be-processed bearing parts under a second temperature to ensure that to-be-processed bearing part materials are subjected to bainite transformation, wherein the first temperature is less than a martensite start transformation temperature of the to-be-processed bearing part materials, and the second temperature is higher than the martensite start transformation temperature of the to-be-processed bearing part materials. The invention also discloses the bearing manufactured by adopting the thermal treatment method. Cooling treatment on the to-be-processed bearing parts is carried out in a water bath manner, so that a salt bath method is avoided, the cost is further reduced, and pollution to an environment is avoided.

Description

technical field [0001] The invention relates to the field of bearing manufacture, in particular to a heat treatment method for a nano-bainite bearing and the bearing produced therefrom. Background technique [0002] Nano-bainite bearing is a kind of bainite bearing, which has the characteristics of high fatigue life, excellent wear resistance and high impact toughness. Therefore, nano-bainite bearing is suitable for impact load conditions. The patented technology of nano-bainite bearing steel disclosed in recent years, whether it is conventional bainite treatment or low-temperature nano-bainite treatment, requires a salt bath method for isothermal treatment. [0003] However, the salt bath method requires professional salt bath equipment for processing. Among them, by adding a certain amount of crystal water into the molten salt to increase the quenching intensity, the rapid cooling of the bearing is realized. However, this salt bath equipment is expensive and also causes ...

Claims

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Application Information

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IPC IPC(8): C21D9/40C21D1/20C21D1/60C21D1/74
CPCC21D1/20C21D1/60C21D1/74C21D9/40C21D2211/002C21D2211/008
Inventor 杨志南张福成吕博张明
Owner YANSHAN UNIV
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