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High Temperature Fatigue Performance of Electron Beam Powder Bed Fusion Manufactured Alloy 718
(PTW)
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-8664-4573
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. Department of Management and Engineering, Linköping University, 58183, Linköping (SWE). (PTW)ORCID iD: 0000-0002-8304-0221
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-7991-6369
2022 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 53, p. 2496-2514Article in journal (Refereed) Published
Abstract [en]

The microstructure and mechanical properties of additively manufactured (AM) parts have been shown to be different from that of cast and wrought counterparts. In this study, electron beam powder bed fusion (EB-PBF) fabricated Alloy 718 was exposed to three different heat treatment routes followed by strain-controlled fatigue testing at 550 degrees C. The fatigue tests were performed with specimens built with their center axis parallel and transverse relative to the build direction. The microstructure showed saturated precipitation of delta-Ni3Nb after repeated solution treatment at 954 degrees C. In contrast, no delta-Ni3Nb precipitates could be observed after a single-step solution treatment at 1025 degrees C. However, the disparity of secondary phases showed no noticeable influence on the fatigue life. A significant difference in fatigue behavior was noted between the parallel and transverse directions. The specimens loaded parallel to the elongated grains showed on average similar to 5x greater life in comparison to the perpendicularly loaded specimens. Compared to corresponding heat-treated material conditions tested at ambient temperature, the specimens showed lower life at high strain amplitude and superior life at low strain amplitude. Moreover, competitive internal and surface failure modes were observed at the lower strain amplitudes while for the higher strain ranges, surface failure modes dominated. (C) The Author(s) 2022

Place, publisher, year, edition, pages
Springer Nature, 2022. Vol. 53, p. 2496-2514
Keywords [en]
Fatigue of materials; Fatigue testing; Microstructure
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-18384DOI: 10.1007/s11661-022-06681-7ISI: 000788952400001Scopus ID: 2-s2.0-85129036732OAI: oai:DiVA.org:hv-18384DiVA, id: diva2:1698789
Funder
Knowledge Foundation, 20160281
Note

This study was founded by the KK foundation through the SUMAN Next project (20160281).  

Available from: 2022-09-26 Created: 2022-09-26 Last updated: 2022-09-26

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Kjellsson, HenrikBalachandramurthi, Arun RamanathanMoverare, JohanHansson, Thomas

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