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Remanufacturing Method of Direct Laser Cladding of Failed Carburized and Quenched Parts

A technology of carburizing and quenching and laser cladding, which is applied in the direction of coating and metal material coating technology, etc., can solve the problems that carburizing and quenching parts cannot be preheated, damage the overall performance of the workpiece, and crack the substrate and repair layer. Achieve the effects of shortening the remanufacturing process, improving remanufacturing efficiency, and saving resources and energy

Active Publication Date: 2022-01-04
泰尔(安徽)工业科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the following characteristics of carburized and quenched parts: 1. After the workpiece is carburized, the surface is quenched, so the carbon content of the carburized layer is very high (>0.8%), and the hardness of the carburized layer after quenching is very high (HRC58-62) ; 2. Carburized and quenched parts cannot be subjected to conventional preheating during remanufacturing and repair (over 200°C, the hardness of the carburized layer will decrease); 3. The hardness of the repaired layer should be equivalent to that of the carburized layer, that is, the repaired layer must also have high hardness
Due to the constraints of the above three conditions, direct laser cladding (surfacing) on ​​the carburized layer will lead to cracking of the substrate and repair layer
Therefore, the current laser cladding basically needs to remove the carburized layer before laser cladding. The disadvantages of this method are: 1. The process is complicated and the cost is high; 2. The removal of the carburized layer destroys the overall performance of the workpiece. The performance of the workpiece after cladding is much worse than the original performance; 3. Since the carburized layer must be removed as a whole, this laser cladding method cannot achieve partial repair of the workpiece

Method used

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  • Remanufacturing Method of Direct Laser Cladding of Failed Carburized and Quenched Parts
  • Remanufacturing Method of Direct Laser Cladding of Failed Carburized and Quenched Parts
  • Remanufacturing Method of Direct Laser Cladding of Failed Carburized and Quenched Parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The matrix body material of the cross shaft is 18Cr2Ni4W alloy, and the mass fraction percentage of the matrix components is as follows: Cr 4.80~5.50wt.%, Mn 0.20~0.50wt.%, Si 0.80~1.20wt.%, Mo 1.00~1.50wt.%. %, V0.30~0.60wt.%, W 1.00~1.50wt.%, P≤0.025wt.%, S≤0.015wt.%, C 0.48~0.55wt.%, and the balance is Fe. After carburizing and quenching treatment: the thickness of the surface carburized layer is ≥3.0mm, the C content on the surface of the carburized layer is 0.85-1.05wt.%, and the surface hardness is 58-62HRC.

[0023] When the cross shaft fails, direct laser cladding is performed on it. The specific steps of the remanufacturing method are:

[0024] ①Cross shaft surface treatment (cleaning + machining):

[0025] Use cleaning techniques such as ultrasonic or pickling to remove oil stains on the surface of the cross shaft, and use grinding wheel grinding and other processing methods to remove the oxide layer on the surface of the workpiece;

[0026] ②Cross axis lase...

Embodiment 2

[0035] The base material of the bearing seat is 20CrNi4, and its surface hardness is 58-62HRC after carburizing and quenching treatment.

[0036] When the bearing seat fails, it is directly laser clad, and the specific steps of the remanufacturing method are:

[0037] ① Bearing surface treatment (cleaning + machining):

[0038] Use ultrasonic or pickling cleaning methods to remove oil stains on the surface of the bearing seat, and use grinding wheel grinding to remove the oxide layer on the surface of the workpiece;

[0039] ②Bearing seat laser cladding:

[0040] According to the base material of the bearing seat, select the cladding material, select the cladding equipment, set the process parameters during cladding, and remanufacture and repair the treated bearing seat surface by laser cladding;

[0041] The remanufactured repair material used in cladding is a powder material with a particle size of 150 mesh to 270 mesh; the mass fraction percentage of the components is as ...

Embodiment 3

[0046] The base material of the flat headgear is 18Cr2Ni4W, after carburizing and quenching: the surface hardness is 58-62HRC.

[0047] When the flat headgear fails, it is directly laser clad, and the specific steps of the remanufacturing method are:

[0048] ①Surface treatment of flat hood (cleaning + machining):

[0049] Ultrasonic or pickling and other cleaning methods are used to remove oil stains on the surface of the flat headgear, and processing methods such as grinding wheel grinding are used to remove the oxide layer on the surface of the workpiece.

[0050] ④Laser cladding of flat headgear:

[0051] According to the base material of the flat hood, select the cladding material, select the cladding equipment, set the process parameters during cladding, and remanufacture and repair the treated flat hood surface by laser cladding;

[0052] The remanufactured repair material used in cladding is a powder material with a particle size of 150 mesh to 270 mesh; the mass fra...

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Abstract

The invention discloses a remanufacturing method for direct laser cladding of failed carburized and quenched parts. The specific steps are: ① surface treatment: surface treatment is performed on the surface of the base body of the failed carburized and quenched parts to keep the surface clean and free of oxide layers; ② Laser cladding: According to the base material, select the cladding material, select the cladding equipment, set the process parameters during cladding, and remanufacture and repair the surface of the treated invalid carburized and quenched parts by laser cladding; ③ Inspection: Crack detection and hardness testing of carburized and quenched parts. Step ② During laser cladding, the remanufactured repair material used is a powder material with a particle size of 150 mesh to 270 mesh; the mass fraction percentage of the components is as follows: C: 0.1~0.17wt.%; Cr: 15~18.5wt .%Mn: 0.3~1.00wt.%; Si: 1.0~1.5wt.%; Mo: 1.2~2.0wt.%; B: 0.8~1.50wt.%; Ni: 1.2~2.0, the balance being Fe. The remanufacturing method of the invention can carry out laser cladding without removing the carburized layer, has no cracks in the cladding layer, and has good forming manufacturability. At the same time, the cladding layer has excellent wear resistance.

Description

technical field [0001] The invention belongs to the field of remanufacturing of mechanical products in material processing, relates to a remanufacturing method of direct laser cladding of carburized and quenched parts, and is applied to remanufacturing in the field of metallurgical industry. Background technique [0002] Carbon is the main element that determines the properties of steel. Generally speaking, the higher the carbon content of the steel, the higher the strength and hardness of the steel, and the better the wear resistance of the steel. For this reason, the surface of steel structure functional parts serving under severe working conditions such as heavy loads and impacts generally needs to be carburized and quenched to achieve the purpose of core toughness and surface hardness, and meet the requirements of use. However, the increase of carbon content will also increase the cold brittleness and aging tendency of steel. Therefore, the welding of carburized and qu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C38/02C22C38/04C22C38/44C22C38/54
CPCC23C24/103C22C38/02C22C38/04C22C38/44C22C38/54
Inventor 董振启吴松黄东保李申申王星李戴伟范郭超张平柳建蔡志海
Owner 泰尔(安徽)工业科技服务有限公司
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