engleski

Mathematical modelling of mechanical properties and microstructure of welded joint

The mathematical model and computer simulation for the prediction of mechanical properties of steel welded joint was developed. In addition, mathematical model for prediction of microstructure composition of steel welded joint was developed. Because of wide range of applicability and ease of use of finite volume method (FVM), this numerical method was suitable to create integrated computer program for simulation of transient temperature field, microstructure transformation and mechanical properties during welding of steel. The computer simulation of mechanical properties and microstructure of welded joint is consisted of numerical calculation of transient temperature field in process of cooling, and of numerical calculation of hardness. The hardness of welded joint has been predicted by conversion of calculated time of cooling from 800 °C to 500 °C to the hardness. After that, distribution of microstructure and hardness of welded joint was found out based on predicted hardness and characteristic cooling time, t8/5. The established procedure was applied in computer simulation of welded joint.

Mathematical modelling; hardness; microstructure; welded joint

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