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Piston top surface thermal fatigue-resistance alloy coating laser cladding method

A technology of laser cladding and thermal fatigue resistance, which is applied in the coating process and coating of metal materials, can solve the problems such as difficulty in obtaining a uniform and stable cladding layer, and achieve the effect of improving the service life

Active Publication Date: 2017-01-04
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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Problems solved by technology

[0004] 38MnVS6 for pistons is a hypoeutectoid steel with a wide austenitizing temperature range, which is prone to cracks during the rapid cooling process of laser cladding, which will have a certain impact on the cladding layer without crack defects and metallurgical bonding. For large-area cladding on the top surface of the piston, as the heat continues to accumulate as the cladding progresses, the condensation process of the cladding layer changes constantly, making it difficult to obtain a uniform and stable cladding layer

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  • Piston top surface thermal fatigue-resistance alloy coating laser cladding method
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Embodiment Construction

[0028] An embodiment of the present invention provides a laser cladding method for a thermal fatigue-resistant alloy coating on the top surface of a piston, comprising the following steps:

[0029] Step 1: Perform machining pretreatment on the top surface of the piston blank; according to the set thickness of the cladding layer, cut the top surface of the piston blank to remove the oxide layer and expose the base material of the piston blank, so that the thickness of the piston after cutting The dimensional difference from the thickness of the finished piston is the set cladding layer thickness, and the error is ≤0.5mm.

[0030] Step 2, set the laser trajectory according to the structure of the top surface of the piston;

[0031] The trajectory of the laser can be set according to the shape, size and thickness of the cladding layer on the top surface of the piston, and multiple multi-layer concentric circles or circles with multiple multi-layer centers on the same axis can be ...

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Abstract

The invention discloses a piston top surface thermal fatigue-resistance alloy coating laser cladding method. The method comprises the following steps: the top surface of a piston blank is mechanically pretreated; a laser walking trajectory is set according to the piston top surface structure; Co-Cr-W alloy powder is used as a cladding material, and is synchronously added to the piston top surface during laser walking; the laser cladding is performed for the piston top surface; and a thermal fatigue-resistance alloy coating layer formed on the piston top surface is a cladding layer. The piston top surface thermal fatigue-resistance alloy coating laser cladding method selects the proper cladding material to embed the laser cladding technology in the piston manufacturing process flow; the thermal fatigue-resistance alloy coating layer metallurgically bonded with a matrix, with controllable thickness and without crack defect is prepared on the piston top surface; and the piston service life is prominently prolonged.

Description

technical field [0001] The invention relates to laser cladding technology, in particular to a laser cladding method for a thermal fatigue-resistant alloy coating on the top surface of a piston. Background technique [0002] At present, with the improvement of diesel engine emission requirements in various countries, diesel engines are developing in the direction of continuously increasing power density and high compactness, and the components of the combustion chamber are subject to higher thermal and mechanical loads. The top surface of the piston is in direct contact with high-temperature and high-pressure gas during the working process. The working environment is extremely harsh and prone to thermal damage. It is urgent to improve its thermal fatigue resistance. [0003] Laser cladding has the characteristics of high power density and rapid melting. It can prepare high-performance surface coatings with dense structure, controllable dilution rate and metallurgical bonding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C19/07
Inventor 虞钢朱天辉郑彩云何秀丽李少霞宁伟健
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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