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Sectioned laser cladding remanufacturing method with preheating and heat treatment for complex parts

A technology of laser cladding and cladding layer, applied in the direction of metal material coating process, coating, etc., can solve the problems of complex crack shape and short length of parts, and achieve the effect of increasing temperature, preventing crack generation and prolonging cooling time.

Inactive Publication Date: 2016-06-01
DALIAN UNIV OF TECH
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Problems solved by technology

However, the three laser beams are always on the same plane, and the cladding path can only be a straight line. The crack shape of the part is complex and the length is very short. The trajectory of the laser beam must match the shape of the crack at all times. This method is not applicable.

Method used

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  • Sectioned laser cladding remanufacturing method with preheating and heat treatment for complex parts
  • Sectioned laser cladding remanufacturing method with preheating and heat treatment for complex parts
  • Sectioned laser cladding remanufacturing method with preheating and heat treatment for complex parts

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The specific process of the segmented laser cladding remanufacturing method is as follows:

[0022] Step 1: On the basis of single-pass single-layer laser cladding, combined with the shape of the laser cladding track and the complexity of the workpiece, determine the laser cladding parameters through experimental trial and error and experience, including laser cladding power, powder feeding volume and scanning speed.

[0023] The laser cladding base material and cladding material are AISI321 and AISI316L austenitic stainless steel respectively. AISI316L austenitic stainless steel has the following characteristics: the transformation of martensite is not involved in the solidification process, so the cause of residual stress can be excluded. Tensitic transformation, in addition, AISI316L austenitic stainless steel has good welding performance, and ...

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Abstract

The invention belongs to the field of laser cladding remanufacturing, and provides a sectioned laser cladding remanufacturing method with preheating and heat treatment for complex parts. According to the invention, on the basis of a single-track and single-layer laser cladding experiment, laser cladding parameters are determined with reference to the track shape of laser cladding and the complexity of workpieces; the laser powers of preheating treatment and aftertreatment are selected according to the laser cladding parameters, the lead time of the laser preheating and the lag time of the heat treatment are determined according to requirements on the surface stress and the surface hardness of the parts, the path length of each laser cladding is determined according to the lead time and the lag time, and the preheating, the laser cladding and the heat treatment are successively carried out on each section. The method is capable of effectively reducing the generation of laser cladding cracks relative to common laser cladding, and is capable of processing a curve path and high in adaptability compared with three-beam preheating and heat treatment laser cladding.

Description

technical field [0001] The invention belongs to the field of laser cladding remanufacturing, in particular to a segmented laser cladding remanufacturing method of complex parts with preheating and heat treatment. Background technique [0002] Compared with traditional subtractive processing, laser cladding is an additive manufacturing method and one of the main repair technologies in the field of remanufacturing. The heat input of laser cladding is very small, so the deformation of the substrate is small. The dilution rate is small and controllable, and the metallurgical bonding performance between the laser cladding layer and the substrate is good. Therefore, it is widely used in aerospace, medicine and other fields. [0003] Remanufacturing technology refers to the use of damaged parts as blanks, and the use of proprietary technologies and processes to process damaged parts to restore their shape and performance to or exceed their original levels. Taking crack damage as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/10C23C24/103
Inventor 徐海岩李涛王鑫林李海波张世新张洪潮
Owner DALIAN UNIV OF TECH
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