ResumoFoi avaliada a possibilidade de aumentar a produtividade do aço IF processado via recozimento contínuo. Amostras laminadas a frio desse aço foram submetidas a ciclos térmicos de recozimento em escala laboratorial, empregando-se menores temperaturas de encharque e maiores velocidades de processamento que as praticadas industrialmente. Foram, então, medidas as propriedades mecânicas em tração e caracterizada a microestrutura do aço. A partir dos resultados mais promissores, bobinas foram processadas industrialmente nas mesmas condições simuladas em escala laboratorial. Em amostras dessas bobinas, foi avaliada, além das propriedades mecânicas e da microestrutura, a conformabilidade de blanks visando à garantia de atendimento dos requisitos de aplicação no cliente. Com os resultados obtidos, verificou-se que é possível produzir o aço IF satisfatoriamente, preenchendo todos os requisitos de aplicação, com um incremento de 10% na velocidade de processamento e uma diminuição de até 30°C, na temperatura de encharque. Esses resultados representam considerável ganho em produtividade no processamento do aço IF. Palavras-chave: Aço IF; Recozimento contínuo; Produtividade. PRODUTIVITY INCREASE OF IF STEEL PROCESSED IN CONTINUOUS ANNEALING LINE AbstractThe possibility to increase the produtivity of IF steel processed in Continuous Annealing Line was evaluated. Cold rolled IF steel samples were subjected to annealing thermal cycles with higher processing speed and lower soaking temperatures than the industrial standard condition. Then the mechanical properties were measured and the microstructure was analyzed. From the best results found in laboratorial analysis, coils of IF steel were processed in the Continuous Annealing Line in the same line speed and soaking temperature simulated in laboratory. Samples were again taken from these annealed coils and the mechanical properties were measured and the microestruture was characterized. The formability of blanks was evaluated to ensure customer requirements. It was found the IF steels can be processed with 10% higher processing speed with a decrease of 30°C in soaking temperature. These results represent considerable produtivity increase in IF steel processing.
The effect of the application of constant temperatures (isothermal plateau) and variables (cooling ramp) during the overaging (OA) stage of the continuous annealing cycle in the microstructural characteristics and mechanical properties of a TRIP steel of the class of 780 MPa was investigated. It was simulated six overaging conditions in the equipment Gleeble. The microstructures presented variable fractions of ferrite, bainite, retained austenite and a small martensite portion. All the conditions achieved the minimum strength of 780 MPa it is possible to highlight the conditions for initial OA temperature of 440 °C where presented the best results of mechanical properties and typical TRIP steels behaviors.
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