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University of Zenica , Zenica , Bosnia and Herzegovina
Because of their properties, superalloys are primarily used for the production of structural parts whose operating conditions correspond to elevated temperatures and often extremely aggressive environments. Because of that, they require a combination of high strength, good fatigue and creep resistance, and good corrosion resistance. Nimonic 80A is a nickel-chromium alloy, which is precipitation hardened with the addition of Al and Ti. The chemical composition of Nimonic 80A alloy has a dominant influence on its mechanical and technological properties. The combination of strength (max. tensile strength 1220 N/mm2) and hardness (HB 370) at room and elevated temperatures with thermal stability at high temperatures makes this alloy most commonly used in extreme working conditions. Nimonic 80A has the widest application in the automotive industry where it is most often used for various parts of turbines, also, a significant part of the application is made up of industrial gas turbines, as well as the application of these materials in medicine. Standard methods and compatible filler metals can be used for welding Nimonic 80A alloy. In this work, TIG (tungsten inert gas) method used for welding samples with a different chemical composition. The aim of testing was investigate the effects of chemical composition on mechanical properties of welding joints superalloyNimonic 80A.
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