Nanoindentation hardness and modulus of Al2O3–SiO2–CaO and MnO–SiO2–FeO inclusions in iron
Oxide inclusions appear in steel as a subproduct of steelmaking. These are generally detrimental to alloy properties; however, variations exist in the extent to which different inclusions are harmful because their properties vary as a function of their chemical composition. We use nanoindentation to...
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| Format: | Journal Article |
| Language: | English |
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2024
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| Online Access: | https://hdl.handle.net/10356/180004 |
| _version_ | 1811697088065437696 |
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| author | Slagter, Alejandra Setyadji, Jonathan Aristya Vogt, Eva Luisa Hernández-Escobar, David Deillon, Lea Mortensen, Andreas |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Slagter, Alejandra Setyadji, Jonathan Aristya Vogt, Eva Luisa Hernández-Escobar, David Deillon, Lea Mortensen, Andreas |
| author_sort | Slagter, Alejandra |
| collection | NTU |
| description | Oxide inclusions appear in steel as a subproduct of steelmaking. These are generally detrimental to alloy properties; however, variations exist in the extent to which different inclusions are harmful because their properties vary as a function of their chemical composition. We use nanoindentation to measure the local elastic modulus and hardness of individual oxide particles, produced by precipitation within liquid iron, that belong to the systems Al2O3–SiO2–CaO and MnO–SiO2–FeO. Measured inclusion hardness values are typically in the range of 8 to 13 GPa and can reach 26 GPa for alumina-rich inclusions. Calcium aluminates rich in alumina are significantly stiffer than iron, with elastic moduli that can reach 350 GPa. On the contrary, calcium aluminates that are expected as a result of successful calcium treatment (i.e., with less than about 80 wt pct Al2O3 content) have elastic moduli below that of iron. This is also the case for the wide range of calcium aluminosilicates and of manganese silicates studied here. In addition, silicates containing about 70 to 80 wt pct MnO are observed to have a fine multiphase structure and an elastic modulus of ≈ 180 GPa. Those inclusions thus emerge as possible candidates if one aims to minimise, in loaded steel, stress concentrations associated with matrix-inclusion elastic mismatch. |
| first_indexed | 2024-10-01T07:49:41Z |
| format | Journal Article |
| id | ntu-10356/180004 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:49:41Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1800042024-09-13T15:45:41Z Nanoindentation hardness and modulus of Al2O3–SiO2–CaO and MnO–SiO2–FeO inclusions in iron Slagter, Alejandra Setyadji, Jonathan Aristya Vogt, Eva Luisa Hernández-Escobar, David Deillon, Lea Mortensen, Andreas School of Materials Science and Engineering Engineering Oxide inclusions Nanoindentation Oxide inclusions appear in steel as a subproduct of steelmaking. These are generally detrimental to alloy properties; however, variations exist in the extent to which different inclusions are harmful because their properties vary as a function of their chemical composition. We use nanoindentation to measure the local elastic modulus and hardness of individual oxide particles, produced by precipitation within liquid iron, that belong to the systems Al2O3–SiO2–CaO and MnO–SiO2–FeO. Measured inclusion hardness values are typically in the range of 8 to 13 GPa and can reach 26 GPa for alumina-rich inclusions. Calcium aluminates rich in alumina are significantly stiffer than iron, with elastic moduli that can reach 350 GPa. On the contrary, calcium aluminates that are expected as a result of successful calcium treatment (i.e., with less than about 80 wt pct Al2O3 content) have elastic moduli below that of iron. This is also the case for the wide range of calcium aluminosilicates and of manganese silicates studied here. In addition, silicates containing about 70 to 80 wt pct MnO are observed to have a fine multiphase structure and an elastic modulus of ≈ 180 GPa. Those inclusions thus emerge as possible candidates if one aims to minimise, in loaded steel, stress concentrations associated with matrix-inclusion elastic mismatch. Nanyang Technological University Published version This work was sponsored by the Swiss National Science Foundation, Grant No. 200021_182557. JAS acknowledges the support of the CN Yang Scholarship Programme. Open access funding provided by EPFL Lausanne. 2024-09-09T06:59:00Z 2024-09-09T06:59:00Z 2024 Journal Article Slagter, A., Setyadji, J. A., Vogt, E. L., Hernández-Escobar, D., Deillon, L. & Mortensen, A. (2024). Nanoindentation hardness and modulus of Al2O3–SiO2–CaO and MnO–SiO2–FeO inclusions in iron. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 55(5), 1469-1483. https://dx.doi.org/10.1007/s11661-024-07330-x 1073-5623 https://hdl.handle.net/10356/180004 10.1007/s11661-024-07330-x 2-s2.0-85186231563 5 55 1469 1483 en Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science © 2024 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creat ivecommons.org/licenses/by/4.0/. application/pdf |
| spellingShingle | Engineering Oxide inclusions Nanoindentation Slagter, Alejandra Setyadji, Jonathan Aristya Vogt, Eva Luisa Hernández-Escobar, David Deillon, Lea Mortensen, Andreas Nanoindentation hardness and modulus of Al2O3–SiO2–CaO and MnO–SiO2–FeO inclusions in iron |
| title | Nanoindentation hardness and modulus of Al2O3–SiO2–CaO and MnO–SiO2–FeO inclusions in iron |
| title_full | Nanoindentation hardness and modulus of Al2O3–SiO2–CaO and MnO–SiO2–FeO inclusions in iron |
| title_fullStr | Nanoindentation hardness and modulus of Al2O3–SiO2–CaO and MnO–SiO2–FeO inclusions in iron |
| title_full_unstemmed | Nanoindentation hardness and modulus of Al2O3–SiO2–CaO and MnO–SiO2–FeO inclusions in iron |
| title_short | Nanoindentation hardness and modulus of Al2O3–SiO2–CaO and MnO–SiO2–FeO inclusions in iron |
| title_sort | nanoindentation hardness and modulus of al2o3 sio2 cao and mno sio2 feo inclusions in iron |
| topic | Engineering Oxide inclusions Nanoindentation |
| url | https://hdl.handle.net/10356/180004 |
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