| Abstract Scope |
In additive manufacturing (AM), the material is created at the same time as the component. Therefore, the properties must be related back to the processing conditions. In laser powder bed fusion, the processing parameters (laser power, speed, etc.) influence the formation of material features (surface roughness, porosity, microstructure, etc.) that affect component performance. A critical challenge impacting the qualification of AM parts is an understanding of the fatigue behavior. This presentation will discuss the influence of processing and material structure on the fatigue performance of nickel-based superalloy 718 through a series of investigations using targeted processing modifications, comprehensive characterization, predictive modeling, innovative test coupon geometries, and novel test methods. The inclusion of in-situ process monitoring techniques provides valuable insights to detect the formation of defects and accelerate processing parameter development for new materials. Implementation of AM in critical applications can be achieved through a fundamental understanding of the processing-structure-properties-performance relationships. |