Development of Methodology to Determine the Temperature Influence on Microstructure Evolution during Friction Stir Welding




Abstract: Annealed Al-5Mg alloy was chosen for the research to avoid the precipitate and dislocation density influence on the mechanical properties. The thermocycles were measured by means of K-type thermocouples during FSW of 2 mm Al-5Mg alloy sheets. The data obtained from thermocouples was used to validate the 3D Finite Element Model. The thermocycles were calculated by means of calibrated model in fourteen different points from the weld situated in Stir Zone, Thermomechanical Affected Zone and Heat Affected Zone on Advancing Side and Retreating Side. The calculated thermocycles in selected points were physically simulated on the Gleeble- 3800 in order to define the individual influence of the temperature on the microstructure evolution in the different weld zones. The microstructure analysis and microhardness measurement of the welds and of the samples were performed in order to define the individual influence of temperature on micr ostructure and mechanical properties evolution.

Authors: Anton A. Naumov, Fedor Yu, Isupov1, Iurii A. Golubev, Iuliia N. Morozova, and Cornelius Spree

Keywords: Friction stir welding; Aluminium alloy; Finite element analysis; Physical simulation; Microstructure evoluti on; Temperature field

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8 pages


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