A heat treatment-assisted laser cladding method

Abstract

The invention provides a heat treatment assisted laser cladding method. The method comprises the following steps that firstly, after the surface of a substrate is pretreated, a precoated layer is arranged on the substrate, and the substrate provided with the precoated layer is arranged on a workbench of a heat treatment furnace; secondly, a lid of the heat treatment furnace is closed to form a confined space, and the furnace inner temperature of the heat treatment furnace is increased according to the speed that the temperature of the heat treatment furnace is increased by at most 10 DEG C perminute, till a preset furnace inner temperature of the heat treatment furnace is reached; thirdly, the lid of the heat treatment furnace is opened, and a laser is aligned with the precoated layer arranged on the substrate, so that laser cladding is performed; fourthly, the lid of the heat treatment furnace is closed to form the confined space, the substrate subjected to laser cladding is cooled to the room temperature in the heat treatment furnace; and fifthly, the substrate subjected to laser cladding is taken out. According to the heat treatment assisted laser cladding method which is efficient, easy and convenient to operate and environmentally friendly, the shortcoming that the crack sensitivity is high in the quick laser heating and cooling processes is overcome.

Description

technical field [0001] The invention relates to the field of laser cladding, in particular to a heat treatment-assisted laser cladding method. Background technique [0002] Heat treatment refers to a metal thermal processing process in which the chemical composition and structure of the surface or interior of the material are changed by means of heating, heat preservation and cooling in the solid state to obtain the required properties. Common heat treatments include: normalizing, annealing, tempering and quenching, taking annealing as an example. Annealing is a metal heat treatment process, which refers to slowly heating the metal to a certain temperature, keeping it for a sufficient time, and then cooling it at an appropriate speed. The purpose is to reduce hardness, improve machinability; eliminate residual stress, stabilize size, reduce deformation and crack tendency; refine grain, adjust structure, and eliminate structure defects. To be precise, annealing is a heat tr...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a heat treatment-assisted laser melting method that overcomes the shortcomings of high crack sensitivity in the process of laser rapid heating and rapid cooling, and provides a high-efficiency, easy-to-operate, environmentally friendly and does not affect laser cladding. Cover method