Study on fatigue damage in additively manufactured IN718 alloy

Selective laser melting (SLM) processed Inconel 718 has promising use in aerospace and power generation industry due to its better mechanical properties and excellent corrosive resistance at elevated temperatures of up to 600-800 degrees C. Parts manufactured using additive manufacturing (AM) techniques come with lots of defects such as porosity, lack of fusion etc, which directly control their mechanical properties. So, it is essential to examine the microstructure and mechanical behaviour of additively manufactured component. In this paper, IN718 alloy specimens were manufactured using SLM process. Tensile and fatigue properties were examined on as-built and heat-treated specimens. It was observed that the heat-treated samples were having higher tensile and yield strength along with the better fatigue property than the as-built samples. Fracture surface zones of fatigue tested specimens were analysed using scanning electron microscopy and a finite element model was established to simulate the SLM process. (c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture - ECF23