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On the Dwell-Fatigue Crack Propagation Behavior of a High-Strength Ni-Base Superalloy Manufactured by Selective Laser Melting
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanik och hållfasthetslära. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0002-8304-0221
2019 (engelsk)Inngår i: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
SPRINGER , 2019.
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URN: urn:nbn:se:liu:diva-162872DOI: 10.1007/s11661-019-05548-8ISI: 000500640800003OAI: oai:DiVA.org:liu-162872DiVA, id: diva2:1382263
Merknad

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]

Tilgjengelig fra: 2020-01-02 Laget: 2020-01-02 Sist oppdatert: 2020-02-03

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