About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Additive Manufacturing: Processing, Microstructure and Material Properties of Titanium-based Materials
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Presentation Title |
Influence of Foreign-Object Damage on the High Cycle Fatigue Properties of Direct Energy Deposition Repaired Ti-6Al-4V |
Author(s) |
Sulochana Shrestha, Manigandan Kannan, Gregory Morscher, Andrew L. Gyekenyesi, Onome E. Scott-Emuakpor |
On-Site Speaker (Planned) |
Sulochana Shrestha |
Abstract Scope |
Additive Manufacturing (AM) approaches based on Direct Energy Deposition (DED) show promise as tools for repairing damaged Integrally Bladed Rotors (IBRs/blisk) which would otherwise require either an expensive replacement or a complicated repair. For the implementation of such repair approaches, proper assessment of material properties should be done under various scenarios. One key concern is the high cycle fatigue (HCF) related failures of IBR due to Foreign Object Damage (FOD) from ingested debris. FOD induces premature crack initiation resulting in unpredictable and accelerated failure of components. This study focuses on the influence of FOD in wrought annealed and DED repaired Ti-6Al-4V using wire feedstock. FOD was simulated by high-speed impacts of steel spheres on the flat surface of the thin, rectangular HCF coupons prior to testing. The impact created stress risers caused a marked reduction in fatigue life as compared to non-impacted coupons. |