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Depth-Sensing Hardness Measurements to Probe Hardening Behaviour and Dynamic Strain Ageing Effects of Iron during Tensile Pre-Deformation

This work reports results from quasi-static nanoindentation measurements of iron, in the un-strained state and subjected to 15% tensile pre-straining at room temperature, 125 °C and 300 °C, in order to extract room temperature hardness and elastic modulus as a function of indentation depth. The mate...

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Autores principales: Veleva, Lyubomira, Hähner, Peter, Dubinko, Andrii, Khvan, Tymofii, Terentyev, Dmitry, Ruiz-Moreno, Ana
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7824167/
https://www.ncbi.nlm.nih.gov/pubmed/33396958
http://dx.doi.org/10.3390/nano11010071
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author Veleva, Lyubomira
Hähner, Peter
Dubinko, Andrii
Khvan, Tymofii
Terentyev, Dmitry
Ruiz-Moreno, Ana
author_facet Veleva, Lyubomira
Hähner, Peter
Dubinko, Andrii
Khvan, Tymofii
Terentyev, Dmitry
Ruiz-Moreno, Ana
author_sort Veleva, Lyubomira
collection PubMed
description This work reports results from quasi-static nanoindentation measurements of iron, in the un-strained state and subjected to 15% tensile pre-straining at room temperature, 125 °C and 300 °C, in order to extract room temperature hardness and elastic modulus as a function of indentation depth. The material is found to exhibit increased disposition for pile-up formation due to the pre-straining, affecting the evaluation of the mechanical properties of the material. Nanoindentation data obtained with and without pre-straining are compared with bulk tensile properties derived from the tensile pre-straining tests at various temperatures. A significant mismatch between the hardness of the material and the tensile test results is observed and attributed to increased pile-up behaviour of the material after pre-straining, as evidenced by atomic force microscopy. The observations can be quantitatively reconciled by an elastic modulus correction applied to the nanoindentation data, and the remaining discrepancies explained by taking into account that strain hardening behaviour and nano-hardness results are closely affected by dynamic strain ageing caused by carbon interstitial impurities, which is clearly manifested at the intermediate temperature of 125 °C.
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spelling pubmed-78241672021-01-24 Depth-Sensing Hardness Measurements to Probe Hardening Behaviour and Dynamic Strain Ageing Effects of Iron during Tensile Pre-Deformation Veleva, Lyubomira Hähner, Peter Dubinko, Andrii Khvan, Tymofii Terentyev, Dmitry Ruiz-Moreno, Ana Nanomaterials (Basel) Article This work reports results from quasi-static nanoindentation measurements of iron, in the un-strained state and subjected to 15% tensile pre-straining at room temperature, 125 °C and 300 °C, in order to extract room temperature hardness and elastic modulus as a function of indentation depth. The material is found to exhibit increased disposition for pile-up formation due to the pre-straining, affecting the evaluation of the mechanical properties of the material. Nanoindentation data obtained with and without pre-straining are compared with bulk tensile properties derived from the tensile pre-straining tests at various temperatures. A significant mismatch between the hardness of the material and the tensile test results is observed and attributed to increased pile-up behaviour of the material after pre-straining, as evidenced by atomic force microscopy. The observations can be quantitatively reconciled by an elastic modulus correction applied to the nanoindentation data, and the remaining discrepancies explained by taking into account that strain hardening behaviour and nano-hardness results are closely affected by dynamic strain ageing caused by carbon interstitial impurities, which is clearly manifested at the intermediate temperature of 125 °C. MDPI 2020-12-30 /pmc/articles/PMC7824167/ /pubmed/33396958 http://dx.doi.org/10.3390/nano11010071 Text en © 2020 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
Veleva, Lyubomira
Hähner, Peter
Dubinko, Andrii
Khvan, Tymofii
Terentyev, Dmitry
Ruiz-Moreno, Ana
Depth-Sensing Hardness Measurements to Probe Hardening Behaviour and Dynamic Strain Ageing Effects of Iron during Tensile Pre-Deformation
title Depth-Sensing Hardness Measurements to Probe Hardening Behaviour and Dynamic Strain Ageing Effects of Iron during Tensile Pre-Deformation
title_full Depth-Sensing Hardness Measurements to Probe Hardening Behaviour and Dynamic Strain Ageing Effects of Iron during Tensile Pre-Deformation
title_fullStr Depth-Sensing Hardness Measurements to Probe Hardening Behaviour and Dynamic Strain Ageing Effects of Iron during Tensile Pre-Deformation
title_full_unstemmed Depth-Sensing Hardness Measurements to Probe Hardening Behaviour and Dynamic Strain Ageing Effects of Iron during Tensile Pre-Deformation
title_short Depth-Sensing Hardness Measurements to Probe Hardening Behaviour and Dynamic Strain Ageing Effects of Iron during Tensile Pre-Deformation
title_sort depth-sensing hardness measurements to probe hardening behaviour and dynamic strain ageing effects of iron during tensile pre-deformation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7824167/
https://www.ncbi.nlm.nih.gov/pubmed/33396958
http://dx.doi.org/10.3390/nano11010071
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