Fatigue Properties and Life Assessment of Nickel-Based Superalloy Inconel 718 Produced by Selective Laser Melting

Project Details


Selective laser melting (SLM) manufacturing is one of the important methods in additive manufacturing. Obviously, SLM has processing advantages over traditional manufacturing processes in prototyping of metal parts or manufacturing of complex shaped parts. This project will continue the plan currently implemented (MOST 108-2221-E-008-098) with Inconel 718 produced by selective laser melting as the target. The tests and analyses of SLM Inconel 718 specimens will be performed to explore the causal relationship between microstructure, fatigue property and failure mechanism. This is a two-year project. In the first year, we will investigate high cycle fatigue properties and stress-life (S-N) fatigue life evaluation model of SLM Inconel 718 specimen. The mean stress correction model in fatigue analysis will be established. The optimal high fatigue life evaluation model will be developed based on the experimental results of variable amplitude fatigue test. In the second year, the fatigue crack growth rate and the residual life estimation of a cracked SLM Inconel 718 specimen were studied by means of fracture mechanics. The mechanisms of fatigue crack initiation and fatigue crack propagation will be discussed. The proposed fatigue life evaluation model will be helpful for solving fatigue design issues of SLM Inconel 718 alloy. The results of this project will be of academic and practical value, and also enhance the industrial application of nickel-based superalloys.
Effective start/end date1/08/2031/05/22

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 9 - Industry, Innovation, and Infrastructure
  • SDG 12 - Responsible Consumption and Production
  • SDG 17 - Partnerships for the Goals


  • selective laser melting
  • additive manufacturing
  • Inconel 718
  • high cycle fatigue
  • fatigue crack growth
  • life evaluation


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