Element distribution prediction simulation method in laser cladding process

Abstract

The invention discloses an element distribution prediction simulation method in a laser cladding process. The element distribution prediction simulation method comprises the following steps: (1) setting a calculation boundary condition, and initializing a calculation condition, an air domain and a matrix domain; (2) starting circulation, calibrating a calculation domain, and setting a laser scanning domain, an air domain, a matrix domain, a powder feeding domain and a heat source; (3) judging the liquid phase volume fraction of the powder feeding domain, and updating the calculation domain inreal time; (4) solving the average size, the average surface density and the solidification rate of the columnar crystal; (5) solving transmission equations of mass, momentum, energy and solute of theliquid phase and the solid phase in a coupling manner; (6) judging a convergence condition, if the convergence condition is not met, entering the next cycle, and if the convergence condition is met,entering the next time step calculation; (7) designing a laser cladding experiment, and preparing a cladding layer longitudinal section sample by adopting metallographic sample preparation; and (8) comparing the simulation result with the actual sample result, verifying the reliability of the simulation result, and then predicting the element distribution in the subsequent laser cladding process.

Description

technical field [0001] The invention relates to a method for predicting and simulating element distribution during the solidification process of molten pools, in particular to a method for predicting and simulating element distribution during laser cladding, and belongs to the field of metal surface modification. Background technique [0002] During the laser cladding process, the metal powder is added to absorb the laser energy and melted. The molten powder interacts with the molten pool formed by the melting of the matrix, resulting in the redistribution of the solute. The concentration distribution of alloying elements has an important influence on the mechanical properties of the cladding layer. ; Liquid phase flow is the main reason for the macroscopic redistribution of alloying elements in the laser cladding process; At present, domestic methods for predicting and simulating the element distribution in the laser cladding process are very lacking, and most methods only p...

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problem that the composition of the molten pool after solidification is difficult to predict in actual production; the simulation results provide effective reference value for actual production

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