Influência do recozimento intermediário no comportamento do aço SAE 1045 laminado a frio
Influência do recozimento intermediário no comportamento do aço SAE 1045 laminado a frio
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DOI: https://doi.org/10.22533/at.ed.130112602033
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Palavras-chave: Laminação a frio, encruamento, recozimento.
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Keywords: Cold rolling, work hardening, annealing.
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Abstract: Steels are widely used in various applications, from the aeronautical industry to decorative items. Among them, medium-carbon steels, such as SAE 1045, stand out for their ability to be mechanically formed by processes such as rolling. This process consists of the plastic deformation of the material by passing a solid body (piece) between two cylinders that rotate at the same speed but in opposite directions. Cold rolling (at room temperature) promotes work hardening of the material, resulting in increased hardness and mechanical strength, accompanied by a reduction in ductility. In this context, intermediate annealing emerges as an alternative to restore ductility and allow the continuation of deformation. The experimental procedure of this study consisted of multiple-pass cold rolling, using low strain rates, of SAE 1045 steel samples. Two processing routes were followed: one corresponding to cold rolling without intermediate annealing until the maximum strain achieved, and another corresponding to cold rolling until 55% strain (thickness reduction) followed by intermediate air annealing under two conditions: 350°C/60min and 700°C/60min, followed by cold rolling again until the maximum strain achieved. Microstructural and mechanical analyses were performed by optical microscopy and Vickers hardness tests, respectively. The results allowed the determination of the material's strain hardening curve and the comparison of the mechanical behavior with and without intermediate annealing. It was found that annealing at 700°C/60min was more effective in reducing hardness, due to the formation of a recrystallized microstructure, showing greater recovery of ductility compared to samples annealed at 350°C.
- Rafael Oliveira Gomes de Lima
- Aguinaldo Soares de Oliveira
- Alexandra de Oliveira França Hayama