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Effect of Ultrasonic Nanocrystal Surface Modification on the Microstructure and Martensitic Transformation of Selective Laser Melted Nitinol

Nitinol has significant potential for biomedical and actuating-sensing devices, thanks to its functional properties. The use of selective laser melting (SLM) with Nitinol powder can promote novel applications aimed to produce 3D complex parts with integrated functional performances. As the final ste...

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Autores principales: Biffi, C.A., Bassani, P., Nematollahi, M., Shayesteh Moghaddam, N., Amerinatanzi, A., Mahtabi, M.J., Elahinia, M., Tuissi, A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6804132/
https://www.ncbi.nlm.nih.gov/pubmed/31547164
http://dx.doi.org/10.3390/ma12193068
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author Biffi, C.A.
Bassani, P.
Nematollahi, M.
Shayesteh Moghaddam, N.
Amerinatanzi, A.
Mahtabi, M.J.
Elahinia, M.
Tuissi, A.
author_facet Biffi, C.A.
Bassani, P.
Nematollahi, M.
Shayesteh Moghaddam, N.
Amerinatanzi, A.
Mahtabi, M.J.
Elahinia, M.
Tuissi, A.
author_sort Biffi, C.A.
collection PubMed
description Nitinol has significant potential for biomedical and actuating-sensing devices, thanks to its functional properties. The use of selective laser melting (SLM) with Nitinol powder can promote novel applications aimed to produce 3D complex parts with integrated functional performances. As the final step of the production route, finishing processing needs to be investigated both for the optimization of the surface morphology and the limit alteration of the Nitinol functional properties. In this work, the effect of an advanced method of surface modification, ultrasonic nanocrystal surface modification (UNSM), on the martensitic transformation and microstructure of SLM built Ni50.8Ti49.2 (at.%) was investigated. Scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry indicated that the UNSM process can generate stress-induced martensite, at least partially suppressing the martensitic transformation. The microhardness profile indicates that the UNSM process can affect the mechanical properties of the SLMed Nitinol sample in a range of up to approximately 750 μm in depth from the upper surface, while electron backscatter diffraction analysis highlighted that the initial austenitic phase was modified within a depth below 200 μm from the UNSMed surface.
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spelling pubmed-68041322019-11-18 Effect of Ultrasonic Nanocrystal Surface Modification on the Microstructure and Martensitic Transformation of Selective Laser Melted Nitinol Biffi, C.A. Bassani, P. Nematollahi, M. Shayesteh Moghaddam, N. Amerinatanzi, A. Mahtabi, M.J. Elahinia, M. Tuissi, A. Materials (Basel) Article Nitinol has significant potential for biomedical and actuating-sensing devices, thanks to its functional properties. The use of selective laser melting (SLM) with Nitinol powder can promote novel applications aimed to produce 3D complex parts with integrated functional performances. As the final step of the production route, finishing processing needs to be investigated both for the optimization of the surface morphology and the limit alteration of the Nitinol functional properties. In this work, the effect of an advanced method of surface modification, ultrasonic nanocrystal surface modification (UNSM), on the martensitic transformation and microstructure of SLM built Ni50.8Ti49.2 (at.%) was investigated. Scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry indicated that the UNSM process can generate stress-induced martensite, at least partially suppressing the martensitic transformation. The microhardness profile indicates that the UNSM process can affect the mechanical properties of the SLMed Nitinol sample in a range of up to approximately 750 μm in depth from the upper surface, while electron backscatter diffraction analysis highlighted that the initial austenitic phase was modified within a depth below 200 μm from the UNSMed surface. MDPI 2019-09-20 /pmc/articles/PMC6804132/ /pubmed/31547164 http://dx.doi.org/10.3390/ma12193068 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Biffi, C.A.
Bassani, P.
Nematollahi, M.
Shayesteh Moghaddam, N.
Amerinatanzi, A.
Mahtabi, M.J.
Elahinia, M.
Tuissi, A.
Effect of Ultrasonic Nanocrystal Surface Modification on the Microstructure and Martensitic Transformation of Selective Laser Melted Nitinol
title Effect of Ultrasonic Nanocrystal Surface Modification on the Microstructure and Martensitic Transformation of Selective Laser Melted Nitinol
title_full Effect of Ultrasonic Nanocrystal Surface Modification on the Microstructure and Martensitic Transformation of Selective Laser Melted Nitinol
title_fullStr Effect of Ultrasonic Nanocrystal Surface Modification on the Microstructure and Martensitic Transformation of Selective Laser Melted Nitinol
title_full_unstemmed Effect of Ultrasonic Nanocrystal Surface Modification on the Microstructure and Martensitic Transformation of Selective Laser Melted Nitinol
title_short Effect of Ultrasonic Nanocrystal Surface Modification on the Microstructure and Martensitic Transformation of Selective Laser Melted Nitinol
title_sort effect of ultrasonic nanocrystal surface modification on the microstructure and martensitic transformation of selective laser melted nitinol
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6804132/
https://www.ncbi.nlm.nih.gov/pubmed/31547164
http://dx.doi.org/10.3390/ma12193068
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