Dynamic and static softening behavior of a titanium added ultra-low carbon steel during hot and warm deformation
| Autor: | Túlio Magno Füzessy de Melo, Dagoberto Brandão Santos, Jônatas Venancio Barbosa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Materials science Carbon steel 02 engineering and technology Flow stress engineering.material 01 natural sciences Biomaterials 0103 physical sciences Composite material Softening lcsh:Mining engineering. Metallurgy 010302 applied physics Austenite Double compression test Metals and Alloys Recrystallization (metallurgy) Softening mechanisms Recrystallization Strain rate 021001 nanoscience & nanotechnology Microstructure Surfaces Coatings and Films Dynamic transformation Ceramics and Composites engineering Warm rolling Dilatometer 0210 nano-technology |
| Zdroj: | Journal of Materials Research and Technology, Vol 9, Iss 3, Pp 2810-2817 (2020) |
| ISSN: | 2238-7854 |
| Popis: | In this work, the mechanical and metallurgical behavior of titanium added ultra-low carbon (ULC-Ti) steel under hot and warm working conditions was studied by means of dilatometer compression tests. Double compression schedules were performed at temperatures between 700 °C and 1000 °C, inter-pass times of 0,5−100 s, and deformations of 0.5 and 0.3 in the first and second stages, respectively, with strain rate of 1 s−1. The analysis of the flow curves obtained allowed the evaluation of the softening characteristics of the steel. The softening and microstructure features indicate different restoration mechanisms depending of the temperature range. Static recrystallization with rapid microstructure restoration is observed at temperatures within the austenitic and intercritical region. Strain induced boundary motion and recovery mechanisms apparently control the restoration process in the ferrite region. In general, flow stress curves showed dynamic recovery behavior. Only the deformation in the intercritical region produced a peak in the flow stress curves. Isothermal holding tests associated with single hit compression indicated the presence of dynamic strain induced transformation, accelerating the softening kinetics at the intercritical region. |
| Databáze: | OpenAIRE |
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