Quantitative evaluation method for laser cladding remanufacturing product heat injury feature

Abstract

The invention discloses a quantitative evaluation method for laser cladding remanufacturing product heat injury feature, wherein the method is used for solving technical problems of single feature, incapable quantitative describing and the like of the existing heat injury evaluation method. According to the method, structure microscopic continuity damage feature, phase change, hardness drastic change and matrix softening caused by material feature difference, residual tensile stress affecting fatigue life, and other physical quantities to co-describe the injury. The technical scheme comprises that the material the same as the laser cladding remanufacturing product and the process are used to carry out single track cladding on the regular surface, the micro-pore feature on the cladding layer cross section and the hardness curve feature on the cross section are detected through the testing method, the feature of the residual stress produced during the laser heat process is calculated through the finite element method, and the injury feature obtained from the experimental and simulation results is combined with the influence of the injury feature on the structure strength to convert the influence into the scalar quantity from 0-1 through mathematical conversion so as to achieve the purpose of the quantitative description of the injury.

Description

technical field [0001] The invention relates to a quantitative evaluation method of thermal damage characteristics of laser cladding remanufactured products, in particular to a quantitative evaluation method of damage characteristics of cladding remanufactured products using dissimilar metal materials. Background technique [0002] In recent years, laser cladding technology has attracted people's attention, and is gradually being applied to the surface modification and remanufacturing of high value-added industrial products. At present, people's research on this technology mainly focuses on how to optimize the process to improve the performance of the product, but there are few studies on the damage characteristics and evaluation methods. For the research on process thermal damage, due to the lack of uniform evaluation standards and strict definitions, there are different expressions in different industries. The typical research fields mainly include grinding, braking and we...

AI Technical Summary

Problems solved by technology

However, the above methods have relatively single evaluation indicators for thermal damage characteristics, and they are all qualitative evaluations.

No quantitative evaluation method has been found for the degree of thermal damage in the laser cladding re-product manufacturing process

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