ISSN 2594-5297
56° Seminário de Laminação e Conformação de Metais — vol. 56, num.56 (2019)
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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 steels of high mechanical strength has been presented as the most applicable. Due to the strong elastic return after the stamping operations, parts that have geometric complexity and require greater mechanical strength are generally produced by hot stamping. The steels employed have addition of boron, such as 22 MnB5. Parallel to the development of steels, 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. 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 to 900 ° C. Through the analysis of microscopy (SEM) and GDOS 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.
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 steels of high mechanical strength has been presented as the most applicable. Due to the strong elastic return after the stamping operations, parts that have geometric complexity and require greater mechanical strength are generally produced by hot stamping. The steels employed have addition of boron, such as 22 MnB5. Parallel to the development of steels, 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. 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 to 900 ° C. Through the analysis of microscopy (SEM) and GDOS 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.
Palavras-chave
Al-Si Coating, Phase transformation, Fe-Al-Si diffusion
Al-Si Coating, Phase transformation, Fe-Al-Si diffusion
Como citar
Cerqueira, F. M.;
Oliveira, C. A. S.;
Neto, B. K.;
Martins, L. P. R..
EFFECT OF HEATING TEMPERATURE ON FE-AL-SI DIFUSION IN AL-SI COATING DURING THE AUSTENITIZATION STAGE IN A HOT STAMPING PROCESS
,
p. 27-34.
In: 56° Seminário de Laminação e Conformação de Metais,
São Paulo,
2019.
ISSN: 2594-5297
, DOI 10.5151/2594-5297-32264
