Microstructure, fatigue, and impact toughness properties of additively manufactured nickel alloy 718
- BATTELLE (PACIFIC NW LAB)
- University of North Texas
- Oerlikon Metco
A complete understanding of processing-structure-property-performance relationship of additively manufactured (AM) components are critical from an application standpoint. Therefore, in the current investigation, a comprehensive microstructural characterization and mechanical properties (tensile, fatigue and impact toughness) evaluation of nickel alloy 718 AM by the laser powder bed fusion (L-PBF) technique have been performed. AM builds were made from powders manufactured via different atomization conditions. Although the standard post-heat treatment procedure led to the removal of severe interdendritic segregation both grain boundary and intra-grain precipitation of d phase occurred. Regardless of d phase presence, axial fatigue properties of both the AM builds were similar to design handbook wrought fatigue data. However, due to the d phase, impact toughness properties were comparable to the wrought material conditions that exhibited d phase. Fractured surfaces of Charpy impact samples exhibited crack propagation extensively along the boundaries decorated by d precipitates.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1614867
- Report Number(s):
- PNNL-SA-150627
- Journal Information:
- Additive Manufacturing, Vol. 28
- Country of Publication:
- United States
- Language:
- English
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