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Effect of Microstructure on the Damage Evolution of Additively Manufactured Inconel 718

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Additively manufactured metal parts offer significant promise for the materials community.  Unfortunately, characterization of the effect of additive manufacturing defects, and the impact that those defects have on the materials’ constitutive response and component life, is a non-trivial endeavor. Defects of note may include both coarse and fine porosity, poorly bonded or un-melted material, the manifestation of local microstructure exhibiting inhomogeneities relative to the bulk component, as well as a plethora of other phenomenon that may lead to unwanted constitutive material and component life response.  This work presents the results of a study elucidating the effect of additively manufactured IN718 material microstructure to specimen macro deformation response, localized surface strains, and specimen fatigue life at elevated temperatures.  Study results are discussed in context of comparison between room temperature and elevated temperature fatigue testing incorporating digital image correlation with results of radiographic, ultrasonic, and micro computed tomography non-destructive evaluation techniques. Results of this work provide a foundation for future effect of defect studies on the elevated fatigue life of IN718.

Learning Objectives:

  • Better understand how defects in additively-manufactured IN718 effect material performance
  • Better understand how additively-manufactured IN718 behaves at room temperature and elevated temperature
  • William Parks
    Advanced Mechanical Engineer
    Southern Research Institute