Abstract
Alloy 718 is an age hardenable nickel-chrome-iron-molybdenum alloy. The age hardening is achieved by specific additions of niobium, titanium and aluminum. Alloy 718 is characterized by good processing properties in the solution-annealed condition, good mechanical short and long-term properties, and great fatigue strength in the age hardened condition, good creep resistance up to 700°C, good oxidation resistance up to approx. 1,000°C, and excellent mechanical properties in low temperatures. Alloy 718 has an austenitic structure; multiple phases can be precipitated. By means of different heat treatments, graduated mechanical properties of the material can be reached. The excellent mechanical properties of Alloy 718 result from the γ’’-formation during the precipitation hardening. Experimental material, Alloy 718, was fatigue tested as in starting stage as received from supplier and after annealing at 800°C for 72 hours dwell time. Fatigue tests were performed on Zwick/Roell Amsler 150 HFP 5100 at room temperature. After finishing two sets of tests the S-N curve and SEM fractography was done to state if, or how the applied annealing has affected fatigue properties of this experimental alloy.
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