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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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/10/2538 |
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| author | Osman El-Atwani Hyosim Kim Jonathan G. Gigax Cayla Harvey Berk Aytuna Mert Efe Stuart A. Maloy |
| author_facet | Osman El-Atwani Hyosim Kim Jonathan G. Gigax Cayla Harvey Berk Aytuna Mert Efe Stuart A. Maloy |
| author_sort | Osman El-Atwani |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-10T06:20:38Z |
| format | Article |
| id | doaj.art-f446c30a89754d2cbb47eb2ae62d49fb |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T06:20:38Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-f446c30a89754d2cbb47eb2ae62d49fb2023-11-22T19:22:50ZengMDPI AGNanomaterials2079-49912021-09-011110253810.3390/nano11102538Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain MachiningOsman El-Atwani0Hyosim Kim1Jonathan G. Gigax2Cayla Harvey3Berk Aytuna4Mert Efe5Stuart A. Maloy6Materials Science and Technology, Los Alamos National Lab, Los Alamos, NM 87545, USAMaterials Science and Technology, Los Alamos National Lab, Los Alamos, NM 87545, USACenter for Integrated Nanotechnologies, Los Alamos, NM 87545, USAMaterials Science and Technology, Los Alamos National Lab, Los Alamos, NM 87545, USADepartment of Metallurgical and Materials Engineering, Middle East Technical University, Ankara 06800, TurkeyDepartment of Metallurgical and Materials Engineering, Middle East Technical University, Ankara 06800, TurkeyMaterials Science and Technology, Los Alamos National Lab, Los Alamos, NM 87545, USABeyond 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.https://www.mdpi.com/2079-4991/11/10/2538nanocrystallinelarge strain machiningmicrotensilenanoindentationHT-9 steel |
| spellingShingle | Osman El-Atwani Hyosim Kim Jonathan G. Gigax Cayla Harvey Berk Aytuna Mert Efe Stuart A. Maloy Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining Nanomaterials nanocrystalline large strain machining microtensile nanoindentation HT-9 steel |
| 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 | nanocrystalline large strain machining microtensile nanoindentation HT-9 steel |
| url | https://www.mdpi.com/2079-4991/11/10/2538 |
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