Method for improving wear resistance and friction reduction of medium and low carbon steel workpieces by carburizing and surface graphitization

A low-carbon steel and graphitization technology, applied in the field of steel material processing, can solve the problems of material loss, energy consumption, economic loss, etc., and achieve the effects of large contact stress, improved wear resistance and high speed

Active Publication Date: 2022-05-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
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Problems solved by technology

[0002] Friction and wear are common phenomena in all kinds of mechanical equipment. The result is: on the one hand, a large amount of energy is consumed, and on the other hand, parts fail to cause a large amount of material loss.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] For the low carbon steel workpiece, this embodiment is carried out according to the following steps:

[0026] For low carbon steel workpieces whose chemical composition and its mass percentage content are: 0.20%C, 1.6%Si, 0.47%Mn, 0.010%P, 0.012%S, 0.0006%B, and the rest are Fe and inevitable impurities ; Its wear-resistant and friction-reducing method is to carry out the first carburizing, surface induction quenching, surface graphitization treatment, second carburizing and its quenching, and low-temperature tempering heat treatment in sequence; The first carburizing is carried out in a carburizing furnace with drip-type controlled atmosphere carburizing. The temperature used in the strong infiltration stage is 895°C, and the carbon potential in the furnace is controlled at 1.75%. When the surface carbon concentration of the workpiece reaches 1.25% Diffusion started at 915 °C, the carbon potential in the furnace was controlled at 1.0%, and the diffusion was ended when ...

Embodiment 2

[0029] For the medium carbon steel workpiece, this embodiment is carried out according to the following steps:

[0030](2) For the chemical composition and its mass percentage content: 0.46%C, 1.30%Si, 0.39%Mn, 0.011%P, 0.013%S, 0.0005%B, the rest content is Fe and inevitable impurities as the material Carbon steel workpiece; its wear-resisting and friction-reducing method is to carry out the heat treatment of complete annealing, surface induction hardening, surface graphitization treatment, carburizing and its quenching, and low temperature tempering in sequence; The temperature is 860 °C, and the holding time is selected according to the maximum thickness of the workpiece, that is, the isothermal temperature of 3.5min / mm, and is cooled to room temperature with the furnace; surface induction hardening is medium frequency induction hardening for the medium carbon steel workpiece after complete annealing treatment. According to the size of the workpiece , Select the current fre...

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Abstract

A method for improving wear resistance and friction reduction of medium and low carbon steel workpieces by carburizing and surface graphitization belongs to the technical field of iron and steel material processing. The method is mainly to carry out surface carburizing treatment and surface graphitization treatment on workpieces made of medium and low carbon steel. The surface carburizing treatment is not only to strengthen the surface layer of the workpiece, but also to increase the carbon content of the surface layer of the workpiece, which is the basis for the subsequent surface layer. The graphitization treatment provides the carbon source; the surface graphitization treatment is to form graphite particles in the carburized layer. After treatment, the surface layer of the medium and low carbon steel workpiece can form an enhanced wear-resistant carburizing structure that supports the load skeleton, and forms graphite particles that reduce the friction coefficient of the friction surface with a solid lubricating effect. Graphite solid lubrication is compounded on the surface of the workpiece. Therefore, the treated medium and low carbon steel workpieces have high wear resistance and friction reduction properties, and can be applied to the wear resistance and friction reduction of friction pairs that work in environments with high contact stress and poor lubrication. on the improvement of friction performance.

Description

technical field [0001] The invention relates to a method for improving wear resistance and friction reduction of medium and low carbon steel workpieces by carburizing and surface graphitization, and belongs to the technical field of iron and steel material processing. Background technique [0002] Friction and wear are common phenomena in all kinds of mechanical equipment. The result is: on the one hand, a large amount of energy is consumed, on the other hand, parts fail and a large amount of materials are lost, and in severe cases, it may even cause huge economic losses. According to incomplete statistics, more than 1 / 3 of the world's energy consumption is caused by various friction losses, and 80% of the machine parts fail due to wear and tear. Therefore, in order to save energy and materials, it is necessary to pay attention to improving the friction and wear resistance of the surface of the friction pair material. [0003] For workpieces made of carbon steel, most of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/22C23C8/80C21D1/10C21D1/18C22C38/02C22C38/04
CPCC23C8/22C23C8/80C21D1/10C21D1/18C22C38/02C22C38/04C22C38/002C21D2211/006Y02P10/25
Inventor 张永军
Owner UNIV OF SCI & TECH BEIJING
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