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Low-hardenability high-carbon gear steel and thermal treatment process

A technology of hardenability and gear steel, which is applied in the direction of heat treatment furnace, heat treatment equipment, process efficiency improvement, etc. It can solve the problems of low carbon content on the surface and wear resistance not meeting the requirements, so as to save energy and improve fatigue The effect of performance and wear resistance

Active Publication Date: 2018-03-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even so, the carbon content is much lower than that of the carburized surface, so the wear resistance still does not meet the requirements, and it cannot be used in large quantities in automobiles and tractor gears.

Method used

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  • Low-hardenability high-carbon gear steel and thermal treatment process
  • Low-hardenability high-carbon gear steel and thermal treatment process
  • Low-hardenability high-carbon gear steel and thermal treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The material composition used is wt%: 1.5C, 2.5Si, 0.5Cr, 0.1Mo, 0.01Cu, and the balance is Fe. After austenitizing at 1050°C, the required size is forged and quenched, and the final forging temperature is 900°C. The forging is heated at 820°C for 1 hour, cooled to 700°C at a rate of 20°C / min, and then air-cooled to obtain figure 1 organization shown. The hardness curve after induction heat treatment is as follows: figure 2 As shown in the UHCS-1 curve, a good thin shell quenching effect is achieved, the surface hardness reaches 1000HV, and the depth of the hardened layer is about 1.5mm, such as image 3 shown.

Embodiment 2

[0030] The material components used are (wt%): 1.0C, 1.0Si, 0.1Cr, 0.3Mo, 0.01Cu and the balance is Fe. After austenitizing at 1050°C, the required size is forged and quenched, and the final forging temperature is 900°C. The forging is heated at 800°C for 6 hours, cooled to 650°C at a rate of 20°C / min, and air-cooled to obtain a ferrite + granular cementite spheroidized structure. After induction heat treatment, the hardness distribution along the surface to the core is as follows: figure 2 Shown in the UHCS-2 curve. The surface hardness is 900HV, and the depth of the hardened layer is about 1.8mm, achieving the effect of thin shell quenching.

Embodiment 3

[0032] The material composition used is (wt%): 1.35C, 0.5Si, 0.5Cr, 0.01Mo, 0.3Cu, and the balance is iron. After austenitizing at 1100°C, the required size is forged and quenched, and the final forging temperature is 850°C. The forging is heated at 800°C for 8 hours, cooled to 650°C at a rate of 20°C / min, and air-cooled to obtain a ferrite + granular cementite spheroidized structure. After induction heat treatment, the hardness distribution along the surface to the core is as follows: figure 2 Shown in the UHCS-3 curve. The surface hardness is 900HV, and a slower hardness gradient appears. The hardness is reduced to 700HV at a distance of 3mm from the surface layer, and the total depth of the hardened layer is about 3mm, achieving the effect of thin shell quenching.

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Abstract

Low-hardenability high-carbon gear steel and a thermal treatment process. The high-carbon gear steel includes 1.0-1.5% of C,0.5-2.5% of Si, 0.1-0.5% of Cr, 0.01-0.3% of Mo, 0.01-0.3% of Cu, 0-0.2% ofV, 0-0.03% of Nb, and the balanced being Fe. The high-carbon gear steel is prepared through the steps of: performing vacuum melting to prepare an ingot, and heating the ingot to completely austenitizethe ingot and maintaining the temperature for a certain time until the ingredients of the alloy are homogenized; during temperature reduction, performing continuous casting into required size, casting terminal temperature being 850-900 DEG C; heating the casted member to 780-820 DEG C and maintaining the temperature for 1-8 h, cooling the casted member to 650-700 DEG C at the rate of 20 DEG C perminute, and moving the product out from the furnace to obtain the ferrite spheroidized cementite structure. The product can satisfy all performance indexes of carburizing steel. The process can savelarge quantity of energy resources.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and in particular relates to a low-hardenability high-carbon gear steel and a heat treatment process. Background technique [0002] The machinery industry is a large electricity consumer in various industries in the society, and the heat treatment industry is also a large electricity consumer in the machinery industry. The carburizing process is a commonly used process in the heat treatment process. The carburizing heat treatment needs to heat the parts to 900-950C° for 8-9 hours. Therefore, the carburizing process consumes a lot of energy, which is the largest energy consumption in the heat treatment process. kind of craft. In addition, the carburizing process needs to decompose kerosene and methanol, which produces a large amount of CO and pollutes the environment. If this process can be replaced, it will produce huge energy saving effect and environmental effect. [0003] T...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/22C22C38/20C22C38/24C22C38/26C22C38/34C21D1/10C21D8/00C21D9/32
CPCC21D1/10C21D8/005C21D9/32C21D2211/003C21D2211/004C21D2211/008C22C38/02C22C38/20C22C38/22C22C38/24C22C38/26C22C38/34Y02P10/25
Inventor 柳永宁孙俊杰张贵一
Owner XI AN JIAOTONG UNIV