The presented work is focused on the influence of imposed strain on the weldability of Dievar alloy. Two mechanisms affecting the microstructure and thus imparting changes in the mechanical properties were applied-heat treatment (hardening and tempering), and rotary swaging. The processed workpieces were further subjected to welding with various welding currents. In order to characterize the effects of welding on the microstructure, especially in the heat-affected zone, and determine material stability under elevated temperatures, samples for uniaxial hot compression testing at temperatures from 600 to 900 °C, optical and scanning electron microscopy, and microhardness testing were taken. The testing revealed that, although the rotary swaged and heat-treated samples featured comparable microhardness, the strength of the swaged material was approximately twice as high as that of the heat-treated one-specifically 1350 MPa. Furthermore, it was found that the rotary swaged sample exhibited favorable welding behavior when compared to the heat-treated one, when the higher welding current was applied.

Department of Metallurgical Technologies Faculty of Materials Science and Technology VŠB Technical University of Ostrava 17 Listopadu 2172 15 708 00 Ostrava Czech Republic

Faculty of Mechanical Engineering Brno University of Technology Technická 2896 616 00 Brno Czech Republic

Institute of Physics of Materials Czech Academy of Science Žižkova 22 616 00 Brno Czech Republic

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