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Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining

Beyond the current commercial materials, refining the grain size is among the proposed strategies to manufacture resilient materials for industrial applications demanding high resistance to severe environments. Here, large strain machining (LSM) was used to manufacture nanostructured HT-9 steel with...

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Autores principales: El-Atwani, Osman, Kim, Hyosim, Gigax, Jonathan G., Harvey, Cayla, Aytuna, Berk, Efe, Mert, Maloy, Stuart A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8541452/
https://www.ncbi.nlm.nih.gov/pubmed/34684979
http://dx.doi.org/10.3390/nano11102538
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author El-Atwani, Osman
Kim, Hyosim
Gigax, Jonathan G.
Harvey, Cayla
Aytuna, Berk
Efe, Mert
Maloy, Stuart A.
author_facet El-Atwani, Osman
Kim, Hyosim
Gigax, Jonathan G.
Harvey, Cayla
Aytuna, Berk
Efe, Mert
Maloy, Stuart A.
author_sort El-Atwani, Osman
collection PubMed
description Beyond the current commercial materials, refining the grain size is among the proposed strategies to manufacture resilient materials for industrial applications demanding high resistance to severe environments. Here, large strain machining (LSM) was used to manufacture nanostructured HT-9 steel with enhanced thermal stability, mechanical properties, and ductility. Nanocrystalline HT-9 steels with different aspect rations are achieved. In-situ transmission electron microscopy annealing experiments demonstrated that the nanocrystalline grains have excellent thermal stability up to 700 °C with no additional elemental segregation on the grain boundaries other than the initial carbides, attributing the thermal stability of the LSM materials to the low dislocation densities and strains in the final microstructure. Nano-indentation and micro-tensile testing performed on the LSM material pre- and post-annealing demonstrated the possibility of tuning the material’s strength and ductility. The results expound on the possibility of manufacturing controlled nanocrystalline materials via a scalable and cost-effective method, albeit with additional fundamental understanding of the resultant morphology dependence on the LSM conditions.
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spelling pubmed-85414522021-10-24 Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining El-Atwani, Osman Kim, Hyosim Gigax, Jonathan G. Harvey, Cayla Aytuna, Berk Efe, Mert Maloy, Stuart A. Nanomaterials (Basel) Article Beyond the current commercial materials, refining the grain size is among the proposed strategies to manufacture resilient materials for industrial applications demanding high resistance to severe environments. Here, large strain machining (LSM) was used to manufacture nanostructured HT-9 steel with enhanced thermal stability, mechanical properties, and ductility. Nanocrystalline HT-9 steels with different aspect rations are achieved. In-situ transmission electron microscopy annealing experiments demonstrated that the nanocrystalline grains have excellent thermal stability up to 700 °C with no additional elemental segregation on the grain boundaries other than the initial carbides, attributing the thermal stability of the LSM materials to the low dislocation densities and strains in the final microstructure. Nano-indentation and micro-tensile testing performed on the LSM material pre- and post-annealing demonstrated the possibility of tuning the material’s strength and ductility. The results expound on the possibility of manufacturing controlled nanocrystalline materials via a scalable and cost-effective method, albeit with additional fundamental understanding of the resultant morphology dependence on the LSM conditions. MDPI 2021-09-28 /pmc/articles/PMC8541452/ /pubmed/34684979 http://dx.doi.org/10.3390/nano11102538 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
El-Atwani, Osman
Kim, Hyosim
Gigax, Jonathan G.
Harvey, Cayla
Aytuna, Berk
Efe, Mert
Maloy, Stuart A.
Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining
title Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining
title_full Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining
title_fullStr Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining
title_full_unstemmed Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining
title_short Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining
title_sort stable, ductile and strong ultrafine ht-9 steels via large strain machining
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8541452/
https://www.ncbi.nlm.nih.gov/pubmed/34684979
http://dx.doi.org/10.3390/nano11102538
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