Crystallographic texture and precipitation control via double austenitization in high-performance tool steel
In the present work, the toughness and wear resistance of AISI A8 cold work high-strength tool steel were improved through the design of a specific double austenitization and tempering heat treatment. The treatment resulted in 80 % improvement in impact toughness and 10 % improvement in wear resista...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-09-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S026412752500841X |
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| author | Hamza Sofiane Meddas Muftah Zorgani Majid Heidari Mousa Javidani Tom Levasseur Mohammad Jahazi |
| author_facet | Hamza Sofiane Meddas Muftah Zorgani Majid Heidari Mousa Javidani Tom Levasseur Mohammad Jahazi |
| author_sort | Hamza Sofiane Meddas |
| collection | DOAJ |
| description | In the present work, the toughness and wear resistance of AISI A8 cold work high-strength tool steel were improved through the design of a specific double austenitization and tempering heat treatment. The treatment resulted in 80 % improvement in impact toughness and 10 % improvement in wear resistance. A combination of high-resolution dilatometry and scanning electron microscopy, including phase compositional and crystallographic analysis, was used to identify the microstructural changes. The findings were analyzed in terms of the influence of the proposed heat treatment on the refinement of the as-quenched martensite substructure and the fraction of high-angle grain boundaries (V1/V2, V1/V3 and V1/V6) variant pairs and the fraction of low-angle grain boundaries (V1/V4) pairs. Notably, block width analysis revealed that in the double austenitization treatment, block width appeared insensitive to prior austenite grain size variations. Additionally, the kinetics of the M23C6 secondary carbides precipitation during isothermal tempering at 520 °C was investigated and modeled. Results demonstrate that the redistribution of carbon in solid solution is the critical microstructural parameter influencing the variant selection and the homogenous precipitation of spherical carbides. The underlying micro-mechanisms responsible for such improvement were identified and their contributions documented and quantified. |
| format | Article |
| id | doaj-art-2bb6914ae4c44dd99b4fad92a35ad904 |
| institution | Kabale University |
| issn | 0264-1275 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj-art-2bb6914ae4c44dd99b4fad92a35ad9042025-08-20T03:56:04ZengElsevierMaterials & Design0264-12752025-09-0125711442110.1016/j.matdes.2025.114421Crystallographic texture and precipitation control via double austenitization in high-performance tool steelHamza Sofiane Meddas0Muftah Zorgani1Majid Heidari2Mousa Javidani3Tom Levasseur4Mohammad Jahazi5Department of Mechanical Engineering, École de Technologie Supérieure (ÉTS), Montréal, QC H3C 1K3, Canada; Corresponding author.Department of Mechanical Engineering, École de Technologie Supérieure (ÉTS), Montréal, QC H3C 1K3, CanadaDK SPEC Company, 1060, Chemin Olivier, St-Nicolas, Lévis, QC G7A 2M8, CanadaDepartment of Applied Science, University of Quebec at Chicoutimi, Saguenay, QC G7H 2B1, CanadaDK SPEC Company, 1060, Chemin Olivier, St-Nicolas, Lévis, QC G7A 2M8, CanadaDepartment of Mechanical Engineering, École de Technologie Supérieure (ÉTS), Montréal, QC H3C 1K3, CanadaIn the present work, the toughness and wear resistance of AISI A8 cold work high-strength tool steel were improved through the design of a specific double austenitization and tempering heat treatment. The treatment resulted in 80 % improvement in impact toughness and 10 % improvement in wear resistance. A combination of high-resolution dilatometry and scanning electron microscopy, including phase compositional and crystallographic analysis, was used to identify the microstructural changes. The findings were analyzed in terms of the influence of the proposed heat treatment on the refinement of the as-quenched martensite substructure and the fraction of high-angle grain boundaries (V1/V2, V1/V3 and V1/V6) variant pairs and the fraction of low-angle grain boundaries (V1/V4) pairs. Notably, block width analysis revealed that in the double austenitization treatment, block width appeared insensitive to prior austenite grain size variations. Additionally, the kinetics of the M23C6 secondary carbides precipitation during isothermal tempering at 520 °C was investigated and modeled. Results demonstrate that the redistribution of carbon in solid solution is the critical microstructural parameter influencing the variant selection and the homogenous precipitation of spherical carbides. The underlying micro-mechanisms responsible for such improvement were identified and their contributions documented and quantified.http://www.sciencedirect.com/science/article/pii/S026412752500841XTool steelMartensiteVariant pairToughnessM23C6 precipitation |
| spellingShingle | Hamza Sofiane Meddas Muftah Zorgani Majid Heidari Mousa Javidani Tom Levasseur Mohammad Jahazi Crystallographic texture and precipitation control via double austenitization in high-performance tool steel Materials & Design Tool steel Martensite Variant pair Toughness M23C6 precipitation |
| title | Crystallographic texture and precipitation control via double austenitization in high-performance tool steel |
| title_full | Crystallographic texture and precipitation control via double austenitization in high-performance tool steel |
| title_fullStr | Crystallographic texture and precipitation control via double austenitization in high-performance tool steel |
| title_full_unstemmed | Crystallographic texture and precipitation control via double austenitization in high-performance tool steel |
| title_short | Crystallographic texture and precipitation control via double austenitization in high-performance tool steel |
| title_sort | crystallographic texture and precipitation control via double austenitization in high performance tool steel |
| topic | Tool steel Martensite Variant pair Toughness M23C6 precipitation |
| url | http://www.sciencedirect.com/science/article/pii/S026412752500841X |
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