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- Title
AVALIAÇÃO DO EFEITO DA OSCILAÇÃO DO MOLDE SOBRE A QUALIDADE DE PLACAS.
- Authors
Fernandes Reis, Rafael; Paço Cunha, Everton; de Freitas Gomes Mendonça, Alexandre
- Abstract
Mold Steel solidification is very important for slab surface quality, considering that the main defect happens during the first stages of shell formation. Thus, many process parameters which influence mold steel solidification should be considered, and one of them is the mold oscillation. Samples of the narrow side of the slabs were obtained from the industrial process and two techniques were developed to evaluate oscillation effect: laser perfilometry and mettallography. Regarding to laser perfilometry, it was developed an analysis method of oscillation mark depth. It was proven the correlation of the average oscillation mark depth with the negative strip time. The reduction on negative strip time by 10% decrease the oscillation mark depth of 0,32 to 0,28 mm, therefore 12,5% The second technique regards to metallography etching based on picric acid, which showed useful to view, by optical microscopy, the hook at the base of oscillation mark. Argon bubbles and flux particles can be captured at oscillation hook region, and eventually cause defects on rolled products. The use of techniques presented in this study provided subsidies for decision making aiming the reduction of oscillation mark depth and hook, resulting in surface quality improvement of slabs produced.
- Subjects
PICRIC acid; MANUFACTURING processes; MICROSCOPY; MANUFACTURING defects; OSCILLATIONS
- Publication
Tecnologia em Metalurgia, Materiais e Mineração, 2018, Vol 15, Issue 4, p391
- ISSN
2176-1515
- Publication type
Article
- DOI
10.4322/2176-1523.20181464