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Sökning: id:"swepub:oai:DiVA.org:hv-17513" > Fatigue crack initi...

  • Sadeghi, Esmaeil,1985-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 (författare)

Fatigue crack initiation and propagation in Alloy 718 with a bimodal grain morphology built via electron beam-powder bed fusion

  • Artikel/kapitelEngelska2021

Förlag, utgivningsår, omfång ...

  • Elsevier Ltd,2021
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:hv-17513
  • https://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-17513URI
  • https://doi.org/10.1016/j.msea.2021.142051DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-181075URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • Financial supports of the Knowledge Foundation for the SupREme project (2018-0203) and Åforsk for the SCC-SUMAN project (18-296) are highly acknowledged. The authors would like to express their gratitude to Mr. Johannes Gårdstam from Quintus Technologies AB for performing the thermal post-treatment on the specimens. Mr. Mats Högström and Mr. Håkan Bäckström of University West deserve special recognition for their significant contributions to the room temperature LCF experiments. Chalmers Materials Analysis Laboratory (CMAL) at the Chalmers University of Technology is appreciated for the assistance with the EBSD/SEM analysis. Dr. Nitesh Raj Jaladurgam of Chalmers University of Technology and Mr. Vui Mai Nguyen of Red River College are greatly acknowledged for the analysis of the EBSD and X-ray CT results, respectively. The authors would like to thank Dr. Niklas Israelsson (Arcam-EBM), and Dr. James Shipley (Quintus Technologies AB), and Mr. Ron Morford (MetCut) for their significant contribution to the specimen manufacturing and post-processing.
  • Funding Agencies|Knowledge Foundation [2018-0203]; Aforsk [18-296]
  • 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 och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Asala, GbengaTechnology Access Centre for Aerospace & Manufacturing, Red River College, Manitoba (CAN),Red River Coll, Canada (författare)
  • Karimi Neghlani, Paria,1986-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(Swepub:hv)paka0016 (författare)
  • Deng, DunyongLinköpings universitet,Konstruktionsmaterial,Tekniska fakulteten(Swepub:liu)dunde74 (författare)
  • Moverare, JohanLinköpings universitet,Konstruktionsmaterial,Tekniska fakulteten(Swepub:liu)johmo31 (författare)
  • Hansson, Thomas,1964-Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),GKN Aerospace Engine Systems, Trollhättan (SWE),PTW,Univ West, Sweden; GKN Aerosp Engine Syst, Sweden(Swepub:hv)thha0010 (författare)
  • Högskolan VästAvdelningen för avverkande och additativa tillverkningsprocesser (AAT) (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Materials Science & Engineering: Elsevier Ltd8270921-50931873-4936

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