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High Temperature Mechanical Integrity of Selective Laser Melted Alloy 718 Evaluated by Slow Strain Rate Tests
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-8304-0221
2021 (English)In: International journal of plasticity, ISSN 0749-6419, E-ISSN 1879-2154, Vol. 140, article id 102974Article in journal (Refereed) Published
Abstract [en]

Strain rate dependent deformation behaviours of selective laser melted Alloy 718 (IN718) are systematically studied at 550 and 650 °C by slow strain rate testing, with a forged counterpart as a reference. Selective laser melted IN718 shows significant susceptibility to intergranular cavitation, resulting in ductility degradation with decreasing strain rate. Detailed fractography and cross section inspections are employed to identify the damage mechanisms. Creep rates are also estimated and compared with the conventional counterparts. The possible critical factors for the inferiority of time dependent damage resistance of selective laser melted IN718 are discussed.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 140, article id 102974
Keywords [en]
IN718; Selective laser melting (SLM); Creep; Environment-assisted grain boundary embrittlement; Slow strain rate test; Cavitation; Surface energy
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-174589DOI: 10.1016/j.ijplas.2021.102974ISI: 000647434800002OAI: oai:DiVA.org:liu-174589DiVA, id: diva2:1539775
Note

Funding: Faculty grant SFOMATLiU from Linkoping University [200900971]; Swedish Governmental Agency for Innovation Systems (Vinnova)Vinnova [2016-05175]

Available from: 2021-03-25 Created: 2021-03-25 Last updated: 2021-05-26Bibliographically approved

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Deng, DunyongPeng, Ru LinMoverare, Johan

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