Abstract
In essence, additively-manufactured, Ni-based superalloy 718 (AM Alloy 718) possesses a strong crystallographic texture, δ-phases and Laves phases, whose effect on fatigue resistance under torsional cyclic loading is yet to be investigated. In order to elucidate the role of microstructural features in small-crack behavior, torsional fatigue testing was conducted on an AM Alloy 718. Test results revealed that crack-growth was controlled by the twist angle, but also by the tilt angle which had been reported to play a minor role in fatigue resistance under uniaxial cyclic loading. Furthermore, the impact of precipitates appeared to be insignificant, with no strong correlation made between their dispersion and the crack-growth rate.
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