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- Title
EFEITO DA TEMPERATURA DE AQUECIMENTO NA DIFUSÃO DE FE-AL-SI EM REVESTIMENTO AL-SI DURANTE A ETAPA DE AUSTENITIZAÇÃO EM UM PROCESSO DE ESTAMPAGEM A QUENTE.
- Authors
Moreira Cerqueira, Fabrício; de Oliveira, Carlos Augusto; Neto, Bruno; Ribeiro Martins, Laura
- Abstract
Currently, continuous implementation of safety and CO2 emission standards in automotive vehicles has driven the search for weight reduction and safety enhancement solutions. In this context, the development of high mechanical strength in steels has been highlight as the most applicable. Those pieces have complex geometric and require greater mechanical strength, thus they are produced by hot stamping. The selected steels for this application have addition of boron, such as 22 MnB5. In parallel, researches related to the development of metallic coatings capable of withstanding mechanical stresses and heat treatment have been carried out. The Al-Si coating composed of Al-Si-Fe multiphases has been strongly used, because during the austenitization occurs to the formation of new phases by the inter-diffusion of Fe and solidification reactions defining the final microstructure. Samples of coated 22MnB5 steel (Al-Si) were treated between temperatures of 500°C to 900 °C. Through the analysis of microscopy (SEM) and GDOES it was possible to identify the diffusion of Fe along the coating layer. Based on the ternary phase diagram and the simulations, it was possible to propose a way of understanding the transformation of the Al-Si coating by the diffusion of the iron.
- Subjects
HIGH strength steel; MECHANICAL heat treatment; METAL coating; DIFFUSION coatings; TERNARY phase diagrams; PHASE diagrams
- Publication
Tecnologia em Metalurgia, Materiais e Mineração, 2019, Vol 16, Issue 3, p306
- ISSN
2176-1515
- Publication type
Article
- DOI
10.4322/2176-1523.20191627