Method for predicting stress field in laser cladding manufacturing process of aluminum oxide ceramic matrix composite coating

Abstract

The invention provides a method for predicting a stress field in a laser cladding manufacturing process of an aluminum oxide ceramic matrix composite coating, and belongs to the technical field of laser cladding. For the laser cladding manufacturing process of the aluminum oxide ceramic matrix composite coating, the method comprises the following steps: firstly, establishing a composite model, andcalculating thermal physical parameters of the aluminum oxide ceramic matrix composite coating by using a representative volume element model method before a numerical simulation process of stress field prediction. During temperature field analysis, the most fundamental reason causing the stress generated by the substrate and the composite material coating is the temperature change caused by heatinput, and a double-heat-source coupling heat source model closer to the actual situation is established, so that the heat source input in the temperature field calculation process is more accurate.Finally, distribution and evolution of a stress field in the laser cladding manufacturing process of the aluminum oxide ceramic matrix composite coating are achieved through a thermal coupling method,and prediction of the stress field is achieved.

Description

technical field [0001] The invention relates to the technical field of laser cladding, in particular to a method for predicting a stress field during the laser cladding manufacturing process of an alumina ceramic matrix composite material coating. Background technique [0002] Laser cladding technology is an emerging surface modification technology in recent years, that is, a surface strengthening technology that uses high-energy laser beams to melt and solidify metal powder on the surface of the substrate. Compared with the traditional surface strengthening technology, the high energy density of the laser cladding technology makes the metal powder melt and solidify quickly, and the laser loading time is short. The short laser loading time makes the substrate absorb less laser energy, and the heat-affected zone of the substrate and The thermal deformation is small; the coating dilution rate produced by cladding is low, and the precision is controllable; the microscopic grain...

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Problems solved by technology

However, this method has great limitations and cannot be applied to composite coatings formed by mixed materials.

Chinese patent CN107862163A discloses a stress field simulation method for YSZ thermal barrier coating prepared by laser cladding nano-YSZ@Ni. The coating involved in this method is a composite coating formed by two materials, but this method only relies on two Different mass fraction ratios of materials, all thermal physical parameters and mechanical physical parameters are obtained by calculating the arithmetic mean value, and the accuracy is poor

However, there are certain limitations in the above methods, and the accuracy is poor.

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