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On the Dwell-Fatigue Crack Propagation Behavior of a High-Strength Ni-Base Superalloy Manufactured by Selective Laser Melting
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Solid Mechanics. 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
2019 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940Article in journal (Refereed) Epub ahead of print
Abstract [en]

This study focuses on the dwell-fatigue crack propagation behavior of IN718 manufactured via selective laser melting (SLM). The dwell-fatigue test condition is 823 K (550 with a long 2160-s dwell-holding period. Effects of heat treatment and loading direction on dwell-fatigue crack propagation rates are studied. A grain boundary delta precipitate seems to be slightly beneficial to the dwell-fatigue cracking resistance of SLM IN718. A comparison has been made between SLM IN718 and forged counterparts at different temperatures, indicating that a creep damage mechanism is likely dominant for SLM IN718 under the present test condition. A general discussion of the inferior creep resistance of SLM IN718 is also included. The anisotropic dwell-fatigue cracking resistance has also been studied and rationalized with the effective stress intensity factor calculated from finite element modeling.

Place, publisher, year, edition, pages
SPRINGER , 2019.
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:liu:diva-162872DOI: 10.1007/s11661-019-05548-8ISI: 000500640800003OAI: oai:DiVA.org:liu-162872DiVA, id: diva2:1382263
Note

Funding Agencies|Linkoping University; Siemens AG in Berlin, Germany; Faculty grant SFO-MAT-LiU at Linkoping University [2009-00971]; Chinese Scholarship CouncilChina Scholarship Council; Agora Materiae; Swedish Governmental Agency for Innovation Systems (Vinnova grant) [2016-05175]

Available from: 2020-01-02 Created: 2020-01-02 Last updated: 2020-02-03

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