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Fatigue crack initi...
Fatigue crack initiation and propagation in Alloy 718 with a bimodal grain morphology built via electron beam-powder bed fusion
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- Sadeghi, Esmaeil, 1985- (författare)
- Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),Multi-Scale Additive Manufacturing Lab (MSAM), The University of Waterloo, Ontario (CAN),PTW,Univ Waterloo, Canada; Univ West, Sweden
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- Asala, Gbenga (författare)
- Technology Access Centre for Aerospace & Manufacturing, Red River College, Manitoba (CAN),Red River Coll, Canada
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- Karimi Neghlani, Paria, 1986- (författare)
- Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),Multi-Scale Additive Manufacturing Lab (MSAM), The University of Waterloo, Ontario (CAN),PTW,Univ Waterloo, Canada; Univ West, Sweden
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- Deng, Dunyong (författare)
- Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten
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- Moverare, Johan (författare)
- Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten
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- Hansson, Thomas, 1964- (författare)
- Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),GKN Aerospace Engine Systems, Trollhättan (SWE),PTW,Univ West, Sweden; GKN Aerosp Engine Syst, Sweden
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(creator_code:org_t)
- Elsevier Ltd, 2021
- 2021
- Engelska.
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Ingår i: Materials Science & Engineering. - : Elsevier Ltd. - 0921-5093 .- 1873-4936. ; 827
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- A unique melting strategy was implemented in electron beam-powder bed fusion (EB-PBF) of Alloy 718, resulting in the formation of a bimodal grain morphology consisting of fine equiaxed and columnar grains. The microstructure was preserved following various thermal post-treatments. The post-treated specimens were exposed to low cycle fatigue (LCF), and fatigue crack growth (FCG) tests in ambient air at 600 °C under pure and dwell-time (120 s) fatigue cycles. Clustered inclusions spanned a region of 100-600 µm in length acted as the crack initiation site, reducing the specimens' total fatigue life. When compared to pure fatigue cycles, dwell-time fatigue cycles reduced LCF life by approximately 35%, regardless of the thermal post-treatments. Due to a high fraction of grain boundary area in the as-built EB-PBF specimens, oxygen diffusion across the grain boundaries was enhanced. The intergranular fracture mode was favored in the plastic zone ahead of the crack tip, leading to rapid crack growth. No unbroken ligaments behind the crack front were found by high-resolution X-ray computed tomography, which was consistent with a large crack opening displacement linked to severe deformation around the crack tip.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
Nyckelord
- 3D printers; Additives; Computerized tomography; Crack tips; Electron beams; Fatigue of materials; Grain boundaries; Morphology; Superalloys; Textures
- Alloy 718; Bimodal grains; Dwell time; Electron-beam; Fatigue crack initiation; Fatigue cycles; Grain morphologies; Grain-boundaries; Powder bed; Thermal post-treatments
- Fatigue crack propagation
- Production Technology
- Produktionsteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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