Experimental Determination of Continuous Cooling Transformation (CCT) Diagrams for Dual-Phase Steels from the Intercritical Temperature Range
The phase transformation kinetics under continuous cooling conditions for intercritical austenite in a cold rolled low carbon steel were investigated over a wide range of cooling rates (0.1–200 ∘ C/s). The start and finish temperatures of the intercritical austenite transformation...
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MDPI AG
2018-08-01
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| Series: | Metals |
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| Online Access: | http://www.mdpi.com/2075-4701/8/9/674 |
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| author | Krishna Bräutigam–Matus Gerardo Altamirano Armando Salinas Alfredo Flores Frank Goodwin |
| author_facet | Krishna Bräutigam–Matus Gerardo Altamirano Armando Salinas Alfredo Flores Frank Goodwin |
| author_sort | Krishna Bräutigam–Matus |
| collection | DOAJ |
| description | The phase transformation kinetics under continuous cooling conditions for intercritical austenite in a cold rolled low carbon steel were investigated over a wide range of cooling rates (0.1–200 ∘ C/s). The start and finish temperatures of the intercritical austenite transformation were determined by quenching dilatometry and a continuous cooling transformation (CCT) diagram was constructed. The resulting experimental CCT diagram was compared with that calculated via JMatPro software, and verified using electron microscopy and hardness tests. In general, the results reveal that the experimental CCT diagram can be helpful in the design of thermal cycles for the production of different grades of dual-phase–advanced high-strengh steels (DP-AHSS) in continuous processing lines. The results suggest that C enrichment of intercritical austenite as a result of heating in the two phases (ferrite–austenite) region and C partitioning during the formation of pro-eutectoid ferrite on cooling significantly alters the character of subsequent austenite phase transformations. |
| first_indexed | 2024-12-14T13:09:55Z |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-14T13:09:55Z |
| publishDate | 2018-08-01 |
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| spelling | doaj.art-ac7a279acd7941f3bc97d2da0c5be5c12022-12-21T23:00:14ZengMDPI AGMetals2075-47012018-08-018967410.3390/met8090674met8090674Experimental Determination of Continuous Cooling Transformation (CCT) Diagrams for Dual-Phase Steels from the Intercritical Temperature RangeKrishna Bräutigam–Matus0Gerardo Altamirano1Armando Salinas2Alfredo Flores3Frank Goodwin4Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Unidad Saltillo, Av. Industria Metalúrgica, 1062, Parque Industrial Saltillo-Ramos Arizpe, Ramos Arizpe 25900, MexicoInstituto Tecnológico de Saltillo, Blvd. Venustiano Carranza, 2400, Col. Tecnológico, Saltillo 25280, MexicoCentro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Unidad Saltillo, Av. Industria Metalúrgica, 1062, Parque Industrial Saltillo-Ramos Arizpe, Ramos Arizpe 25900, MexicoCentro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Unidad Saltillo, Av. Industria Metalúrgica, 1062, Parque Industrial Saltillo-Ramos Arizpe, Ramos Arizpe 25900, MexicoInternational Lead Zinc Research Organization, Inc., 1822 East NC Highway 54, Durham, NC 27713, USAThe phase transformation kinetics under continuous cooling conditions for intercritical austenite in a cold rolled low carbon steel were investigated over a wide range of cooling rates (0.1–200 ∘ C/s). The start and finish temperatures of the intercritical austenite transformation were determined by quenching dilatometry and a continuous cooling transformation (CCT) diagram was constructed. The resulting experimental CCT diagram was compared with that calculated via JMatPro software, and verified using electron microscopy and hardness tests. In general, the results reveal that the experimental CCT diagram can be helpful in the design of thermal cycles for the production of different grades of dual-phase–advanced high-strengh steels (DP-AHSS) in continuous processing lines. The results suggest that C enrichment of intercritical austenite as a result of heating in the two phases (ferrite–austenite) region and C partitioning during the formation of pro-eutectoid ferrite on cooling significantly alters the character of subsequent austenite phase transformations.http://www.mdpi.com/2075-4701/8/9/674advanced high-strength steelsdual-phase steelintercritical transformationCCT diagramscontinuous annealingmicrostructure |
| spellingShingle | Krishna Bräutigam–Matus Gerardo Altamirano Armando Salinas Alfredo Flores Frank Goodwin Experimental Determination of Continuous Cooling Transformation (CCT) Diagrams for Dual-Phase Steels from the Intercritical Temperature Range Metals advanced high-strength steels dual-phase steel intercritical transformation CCT diagrams continuous annealing microstructure |
| title | Experimental Determination of Continuous Cooling Transformation (CCT) Diagrams for Dual-Phase Steels from the Intercritical Temperature Range |
| title_full | Experimental Determination of Continuous Cooling Transformation (CCT) Diagrams for Dual-Phase Steels from the Intercritical Temperature Range |
| title_fullStr | Experimental Determination of Continuous Cooling Transformation (CCT) Diagrams for Dual-Phase Steels from the Intercritical Temperature Range |
| title_full_unstemmed | Experimental Determination of Continuous Cooling Transformation (CCT) Diagrams for Dual-Phase Steels from the Intercritical Temperature Range |
| title_short | Experimental Determination of Continuous Cooling Transformation (CCT) Diagrams for Dual-Phase Steels from the Intercritical Temperature Range |
| title_sort | experimental determination of continuous cooling transformation cct diagrams for dual phase steels from the intercritical temperature range |
| topic | advanced high-strength steels dual-phase steel intercritical transformation CCT diagrams continuous annealing microstructure |
| url | http://www.mdpi.com/2075-4701/8/9/674 |
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