Simulation of repair welding and local heat treatment including microstructure calculation

Important results from the project

Simulation of repair welding and local heat treatment including microstructure calculationThe project is a continuation of an earlier project where a model for simulation of induction heating was developed and validated. The purpose is to enable simulating a manufacturing chain consisting of repair welding and local heat treatment with induction heating in order to predict deformations, stresses and microstructure evolution. The focus is on developing a microstructure model coupled with a constitutive model for Alloy 718. The model will be applicable also for other thermo-mechanical processes.

Expected long term effects

Local heat treatment is a method that Volvo Aero Cooperation mainly uses for stress relieving/ageing in connection with repair. Simulation of repair welding and local heat treatment with use of induction heating gives the possibility to design those steps in order to optimize for microstructure, deformations and residual stresses. In local heat treatment by induction, there is always a risk that the temperature, close to the boundary, is outside the specified temperature. By calculating the resulting microstructure, an image of what is happened close to the boundary, and what it really means, makes it possible to open a dialogue with Volvo Aeros customers in order to allow local heating instead of global.

Approach and implementation

- Literature Study - Materials testing and characterization of microstructure - Mechanical material testing - Development and calibration of microstructure model and flow stress model - Validation of model - Validation test for repair welding and induction heating - Simulation of repair welding and induction heating with empiric material model. - Simulation of repair welding and induction heating with microstructure model.