Relating porosity to fatigue failure in additively manufactured alloy 718

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:727

Article

Sheridan, Luke^1,2  Scott-Emuakpor, Onome E.¹  George, Tommy¹  Gockel, Joy E.² 

[1] Air Force Res Lab, Aerosp Syst Directorate, Turbine Engine Struct Integr Branch, 2130 Eighth St,Rm 136, Dayton, OH 45433 USA

[2] Wright State Univ, Mech & Mat Engn, 3640 Colonel Glenn Hwy, Dayton, OH 45435 USA

关键词: Additive manufacturing;    Alloy 718;    Fatigue;    Crack growth rate;    Porosity;   

DOI  :  10.1016/j.msea.2018.04.075

来源: Elsevier

【 摘 要 】

Additive manufacturing (AM) has the potential to revolutionize the way parts are designed and manufactured; however, AM also produces defects that influence the performance of the components. In order to ensure the quality of the manufactured parts, the processing-structure-property-performance (PSPP) relationship must be understood. In this study, the porosity created during the AM process is investigated, and its influence on performance is quantified with respect to the PSPP framework. Test specimens were fabricated with different processing pedigrees, and the porosity populations within each specimen was characterized. The fatigue life of the specimen was predicted based on the size and location of porosity using a fatigue crack growth approach. Results show that the fatigue life can be successfully predicted, when the appropriate crack growth behavior is used. The insight gained in this study will inform future AM fatigue studies and will lay the groundwork for design and qualification of fracture-critical AM components.

【 授权许可】

Free