Surface treatment method for solid carbon-boron complex penetration of low-carbon alloy steel part

A low-carbon alloy steel and low-carbon alloy technology, applied in heat treatment equipment, solid-state diffusion coating, metal material coating technology, etc., can solve the problems of boronizing layer brittleness, peeling, etc., and achieve improved corrosion resistance and low equipment requirements , the effect of not easy to fall off

Inactive Publication Date: 2015-11-25
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain defects in the traditional boronizing method. After boronizing alone and surface boron layer quenching, a large stress will be generated on the surface of the workpiece. Although the surface hardness is high, the boronizing layer is relatively brittle and easy to peel off from the substrate.

Method used

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  • Surface treatment method for solid carbon-boron complex penetration of low-carbon alloy steel part

Examples

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Effect test

Embodiment 1

[0028] A surface treatment method for solid carbon-boron compound infiltration of low-carbon alloy steel parts, comprising the following steps:

[0029] a. The carburizing agent and carburizing box are dried at 200°C for 3 hours respectively; the low-carbon alloy steel parts are placed in anhydrous ethanol solution and ultrasonicated for 20 minutes to clean the surface of the workpiece and remove oil stains;

[0030] b. After the treatment in step a, put the carburizing agent in the bottom of the carburizing box, then put the low-carbon alloy steel parts into the carburizing box, and then put the carburizing agent again to make the carburizing agent Cover the workpiece by 5mm; cover the upper cover of the carburizing box, and use water glass mud prepared from water glass and refractory mud to coat the joint surface between the edge of the upper cover and the inner wall of the infiltration box, and then seal the upper cover; Put the carburizing box into the resistance furnace f...

Embodiment 2

[0038] A surface treatment method for solid carbon-boron compound infiltration of low-carbon alloy steel parts, comprising the following steps:

[0039] a. The carburizing agent and carburizing box are dried at 190°C for 4 hours respectively; the low-carbon alloy steel parts are placed in anhydrous ethanol solution and ultrasonicated for 30 minutes to clean the surface of the workpiece and remove oil stains;

[0040] b. After the treatment in step a, pour the carburizing agent into the bottom of the carburizing box, then put the low-carbon alloy steel parts into the carburizing box, and then put in the carburizing agent again to make the carburizing Cover the workpiece with 6mm of agent; cover the upper cover of the carburizing box, and use water glass mud prepared from water glass and refractory mud to coat the joint surface between the edge of the upper cover and the inner wall of the infiltration box, and then seal the upper cover; Put the carburizing box into the resistanc...

Embodiment 3

[0048] A surface treatment method for solid carbon-boron compound infiltration of low-carbon alloy steel parts, comprising the following steps:

[0049] a. The carburizing agent and carburizing box are dried at 210°C for 2 hours respectively; the low-carbon alloy steel parts are placed in anhydrous ethanol solution and ultrasonicated for 10 minutes to clean the surface of the workpiece and remove oil stains;

[0050] b. After the treatment in step a, put the carburizing agent in the bottom of the carburizing box, then put the low-carbon alloy steel parts into the carburizing box, and then put the carburizing agent again to make the carburizing agent Cover the workpiece by 5mm; cover the upper cover of the carburizing box, and use water glass mud prepared from water glass and refractory mud to coat the joint surface between the edge of the upper cover and the inner wall of the infiltration box, and then seal the upper cover; Put the carburizing box into the resistance furnace f...

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Abstract

The invention discloses a surface treatment method for solid carbon-boron complex penetration of a low-carbon alloy steel part. The method at least comprises the steps of: (a) carburizing pretreatment and steel part cleaning; (b) carburizing treatment; (c) taking out of a penetration box for carburizing from a resistance furnace, natural cooling to a room temperature, and taking out of a low-carbon alloy steel part after the carburizing treatment; (d) boriding pretreatment and steel part cleaning; (e) boriding treatment; (f) taking out of a penetration box for boriding from the resistance furnace after the boriding treatment in the step (e), natural cooling to the room temperature, and taking out of a low-carbon alloy steel part after the boriding treatment; (g) quenching treatment; and (h) tempering treatment. The method has the following beneficial effects: the carburizing and the boriding are performed in sequence to form a transition layer on the surface of the low-carbon alloy steel, so that a boriding layer and a steel basal body are better in combination and not easy to drop.

Description

technical field [0001] The present invention relates to an alloy surface treatment method, in particular to a surface treatment method for solid carbon-boron compound infiltration of low-carbon alloy steel parts. Background technique [0002] Low-carbon steel is carbon steel with a carbon content of less than 0.25%. Alloy steel is relative to carbon steel. On the basis of carbon steel, in order to improve one or several properties of steel, a Or several alloy elements, when the amount of alloy added exceeds the general content of carbon steel in the normal production method, this steel is called alloy steel. [0003] Carburizing is a chemical heat treatment method. The carburizing material is mostly low-carbon steel or low-carbon alloy steel. The specific method is to place the workpiece in a medium with activated carbon and heat it to a single-phase austenite zone of 900-950°C. After holding for a sufficient time, the activated carbon atoms decomposed in the carburizing me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/78C21D1/18C21D1/56
Inventor 商剑张越赵作福刘亮
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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