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Inertia friction welding involves the interaction of thermal, mechanical and metallurgical phenomena. The study of this process was performed on Astroloy. The evolution of the microstructure of the superalloy was determined and modeled in relation to the heating rate, temperature and strain rate. The deformation microstructures were examined by transmission electron microscopy on high temperature torsion test samples and qualitatively related to the temperature and the strain rate of the experiment. A numerical simulation of a friction welding experiment is described. The predictions of the model are compared to experimental measurements and observations on welds.

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