Datum
2020Autor
Wegener, ThomasBrenne, FlorianFischer, AndreasMöller, TimoHauck, ChristophAuernhammer, StefanNiendorf, ThomasSchlagwort
600 Technik 660 Chemische Verfahrenstechnik, Technische Chemie Invar-LegierungRapid Prototyping <Fertigung>Selektives LaserschmelzenErmüdung bei niedrigen LastspielzahlenMikrostrukturMechanische EigenschaftMetadata
Zur Langanzeige
Aufsatz
On the structural integrity of Fe-36Ni Invar alloy processed by selective laser melting
Zusammenfassung
Specimens made from pre-alloyed Invar (Fe-36Ni) powder were fabricated by selective laser melting and stress-relief heat treated afterwards. A relative density of the fabricated parts of 99.6 % was determined by computed tomography. The microstructure and mechanical behavior under monotonic and particularly cyclic loading at ambient temperature were investigated. Results reveal a bimodal microstructure containing columnar and equiaxed grains with an average grain size of 75 μm and pronounced texture 〈001〉 || BD. The selective laser melted Invar is characterized by a homogeneous hardness distribution revealing no gradient with respect to the height of the fabricated parts. The mechanical response under monotonic tensile loading is characterized by a fairly ductile behavior. Total strain controlled low-cycle fatigue tests with varying strain amplitudes were performed. The cyclic deformation response is characterized by highly reproducible behavior in terms of stress amplitudes and number of cycles to failure. The corresponding half-life hysteresis loops reveal perfect Masing behavior. Post-mortem fractography revealed crack initiation in direct vicinity of the surfaces. The damage tolerance of Invar is found to be promoted by its high ductility. Finally, a low coefficient of thermal expansion, very similar to conventionally processed Invar, was shown by dilatometer tests in the temperature range of 0 °C–180 °C.
Zitierform
In: Additive Manufacturing Volume 37 (2020) eissn:2214-7810Zusätzliche Informationen
© This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/Zitieren
@article{doi:10.17170/kobra-202311309142,
author={Wegener, Thomas and Brenne, Florian and Fischer, Andreas and Möller, Timo and Hauck, Christoph and Auernhammer, Stefan and Niendorf, Thomas},
title={On the structural integrity of Fe-36Ni Invar alloy processed by selective laser melting},
journal={Additive Manufacturing},
year={2020}
}
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2023-12-22T13:23:59Z 2023-12-22T13:23:59Z 2020 doi:10.17170/kobra-202311309142 http://hdl.handle.net/123456789/15325 © This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ eng Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ Invar 36 additive manufacturing selective laser melting low-cycle fatique microstructure 600 660 On the structural integrity of Fe-36Ni Invar alloy processed by selective laser melting Aufsatz Specimens made from pre-alloyed Invar (Fe-36Ni) powder were fabricated by selective laser melting and stress-relief heat treated afterwards. A relative density of the fabricated parts of 99.6 % was determined by computed tomography. The microstructure and mechanical behavior under monotonic and particularly cyclic loading at ambient temperature were investigated. Results reveal a bimodal microstructure containing columnar and equiaxed grains with an average grain size of 75 μm and pronounced texture 〈001〉 || BD. The selective laser melted Invar is characterized by a homogeneous hardness distribution revealing no gradient with respect to the height of the fabricated parts. The mechanical response under monotonic tensile loading is characterized by a fairly ductile behavior. Total strain controlled low-cycle fatigue tests with varying strain amplitudes were performed. The cyclic deformation response is characterized by highly reproducible behavior in terms of stress amplitudes and number of cycles to failure. The corresponding half-life hysteresis loops reveal perfect Masing behavior. Post-mortem fractography revealed crack initiation in direct vicinity of the surfaces. The damage tolerance of Invar is found to be promoted by its high ductility. Finally, a low coefficient of thermal expansion, very similar to conventionally processed Invar, was shown by dilatometer tests in the temperature range of 0 °C–180 °C. open access Wegener, Thomas Brenne, Florian Fischer, Andreas Möller, Timo Hauck, Christoph Auernhammer, Stefan Niendorf, Thomas doi:10.1016/j.addma.2020.101603 Invar-Legierung Rapid Prototyping <Fertigung> Selektives Laserschmelzen Ermüdung bei niedrigen Lastspielzahlen Mikrostruktur Mechanische Eigenschaft acceptedVersion eissn:2214-7810 Additive Manufacturing Volume 37 false 101603
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