Method for carbonitriding on stainless steel surface

A carbonitriding, stainless steel technology, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problem of inability to obtain high strength residual stress, increased brittleness of bulk carbonitride, and affect wear resistance. problems such as resistance and fatigue strength, to achieve the effect of high hardness, accelerated infiltration speed, and high production efficiency

Inactive Publication Date: 2020-08-07
广州珈鹏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carbonitriding process must strictly control the carbonitride concentration of the carburized layer. If the content is too low, high strength, hardness and ideal residual stress cannot be obtained, which affects wear resistance and fatigue strength. On the contrary, a large number of uneven blocks appear on the surface Like carbon and nitrogen compounds, increased brittleness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for surface carbonitriding of stainless steel, comprising the following steps:

[0029] (1) Quenching and tempering treatment

[0030] Quenching and tempering treatment of stainless steel, including quenching and tempering;

[0031] After the stainless steel is quenched, it is oil-cooled, the quenching temperature is 800±10°C, and it is kept for 2 hours; after tempering, it is air-cooled, and the tempering temperature is 500±10°C, and it is kept for 3 hours;

[0032] (2) Ion implantation of rare earth elements

[0033] Adopt plasma immersion ion implantation technology to implant rare earth ions to the stainless steel surface of step (1); 15 cm -2 ;

[0034] (3) Carbonitriding

[0035] Put the stainless steel in step (2) into a vacuum furnace, heat to 800±10°C, keep the temperature for 20min, continue to maintain the temperature at 800±10°C, control the carbon potential to 0.9%, ammonia gas flow rate to 0.7L / min, and keep warm for 30min;

[0036] Cool dow...

Embodiment 2

[0041] A method for surface carbonitriding of stainless steel, comprising the following steps:

[0042] (1) Quenching and tempering treatment

[0043] Quenching and tempering treatment of stainless steel, including quenching and tempering;

[0044] After the stainless steel is quenched, it is oil-cooled, the quenching temperature is 800±10°C, and it is kept for 1h; after tempering, it is air-cooled, and the tempering temperature is 500±10°C, and it is kept for 2h;

[0045] (2) Ion implantation of rare earth elements

[0046] Adopt plasma immersion ion implantation technology to implant rare earth ions to the stainless steel surface of step (1); 15 cm -2 ;

[0047] (3) Carbonitriding

[0048] Put the stainless steel in step (2) into a vacuum furnace, heat to 800±10°C, keep the temperature for 30min, continue to maintain the temperature at 800±10°C, control the carbon potential to 1.1%, ammonia gas flow rate to 0.7L / min, and keep warm for 20min;

[0049] Cool down to 700±1...

Embodiment 3

[0054] A method for surface carbonitriding of stainless steel, comprising the following steps:

[0055] (1) Quenching and tempering treatment

[0056] Quenching and tempering treatment of stainless steel, including quenching and tempering;

[0057] After the stainless steel is quenched, it is oil-cooled, the quenching temperature is 800±10°C, and it is kept for 2 hours; after tempering, it is air-cooled, and the tempering temperature is 500±10°C, and it is kept for 3 hours;

[0058] (2) Ion implantation of rare earth elements

[0059] Adopt plasma immersion ion implantation technology to implant rare earth ions to the stainless steel surface of step (1); 15 cm -2 ;

[0060] (3) Carbonitriding

[0061] Put the stainless steel in step (2) into a vacuum furnace, heat to 800±10°C, keep the temperature for 30min, continue to maintain the temperature at 800±10°C, control the carbon potential to 1.0%, ammonia gas flow rate to 0.6L / min, and keep warm for 25min;

[0062] Cool dow...

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PUM

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Abstract

The invention discloses a method for carbonitriding on a stainless steel surface. By quenching and tempering and ion implanting of rare earth elements on the stainless steel surface, the temperature,carbon potential and ammonia flow rate in a carbonitriding process can be fully controlled. A thickness and a microstructure of a carbonitriding layer on the stainless steel surface can be effectivelycontrolled, and stainless steel products with high strength, high hardness, good wear resistance and excellent fatigue resistance can be obtained. The method for carbonitriding on the stainless steelsurface has the good advantages of short production cycle, simple method and high production efficiency and can be applied to industrial production.

Description

technical field [0001] The invention belongs to the technical field of material surface treatment, and in particular relates to a method for carbonitriding the surface of stainless steel. Background technique [0002] Because stainless steel has good hardness, corrosion resistance, strong toughness and other advantages, it is widely used in construction, petrochemical, nuclear industry, aerospace and other fields, but in practical applications, there will still be serious surface wear, insufficient strength and long service life. Short and other problems seriously affect its reliability. Therefore, it is necessary to take various strengthening measures to improve the performance of the developed stainless steel grades, further exert the advantages of various stainless steels, and expand their application range. The surface modification treatment technology of stainless steel is one of the methods to effectively improve the surface hardness, wear resistance and fatigue resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/32C23C8/02C23C8/80
CPCC23C8/02C23C8/32C23C8/80
Inventor 谢珈璐
Owner 广州珈鹏科技有限公司
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