Microstructure, fatigue, and impact toughness properties of additively manufactured nickel alloy 718
| Autor: | Rajiv S. Mishra, Mageshwari Komarasamy, Sarah Williams, S. M. Kelly, Shivakant Shukla, Kumar Kandasamy |
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| Rok vydání: | 2019 |
| Předmět: |
0209 industrial biotechnology
Fusion Materials science Precipitation (chemistry) Biomedical Engineering Charpy impact test Fracture mechanics 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure Industrial and Manufacturing Engineering 020901 industrial engineering & automation Phase (matter) Ultimate tensile strength General Materials Science Grain boundary Composite material 0210 nano-technology Engineering (miscellaneous) |
| Zdroj: | Additive Manufacturing. 28:661-675 |
| ISSN: | 2214-8604 |
| DOI: | 10.1016/j.addma.2019.06.009 |
| Popis: | 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 δ phase occurred. Regardless of δ phase presence, axial fatigue properties of both the AM builds were similar to design handbook wrought fatigue data. However, due to the δ phase, impact toughness properties were comparable to the wrought material conditions that exhibited δ phase. Fractured surfaces of Charpy impact samples exhibited crack propagation extensively along the boundaries decorated by δ precipitates. |
| Databáze: | OpenAIRE |
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