Dendritic crystal growth numerical simulation method in nickel-based alloy multi-pass surfacing process

Abstract

The invention discloses a dendritic crystal growth numerical simulation method in a nickel-based alloy multi-pass surfacing process. The method comprises the following specific steps: defining the shape of a first surfacing welding pool, and establishing a dendrite nucleation and growth model and a solute distribution and diffusion model, secondly, defining the shape of a second surfacing weldingpool on the basis of the first surfacing welding, establishing a dendrite nucleation and growth model and a solute distribution and diffusion model, finally writing a computer program, inputting alloythermophysical parameters and various welding process parameters, importing simulation calculation software, and performing calculation to obtain a simulation result. Compared with experimental research, the method consumes less time and saves more maternal and labor resources, influences of microstructure morphology evolution, solute concentration distribution, welding current, welding voltage,thermal disturbance amplitude and other parameters on dendritic crystal growth in the nickel-based alloy multi-pass surfacing process can be simulated, and therefore a certain reference effect is achieved for selection and formulation of the nickel-based alloy multi-pass surfacing welding process.

Description

technical field [0001] The invention belongs to the technical field of numerical simulation of metal material welding, and in particular relates to a numerical simulation method of dendrite growth in the multi-pass surfacing welding process of nickel-based alloys. Background technique [0002] Compared with the single-pass surfacing welding process, multi-pass surfacing welding has the effect of normalizing the first welding seam on the second welding seam. Multi-pass welding can improve the secondary structure and improve the quality of the weld metal (especially the plasticity). In particular, the post-weld heat treatment process is omitted, the production cycle is shortened, and the economic benefits are greatly improved. In addition, under the action of a large amount of nonlinear thermal energy in the moving heat source, residual stress is often generated during the welding process and changes the microstructure, and multi-pass welding can effectively improve this pheno...

AI Technical Summary

Problems solved by technology

At present, there are few reports on the numerical simulation of the solidification structure of the multi-pass surfacing molten pool. Therefore, it is particularly important to establish a numerical simulation method for the solidification structure of the multi-pass surfacing molten pool.

Images