Influence of Interfacial Layer Growth on the Kinetics of Iron Enrichment in Hot-dip Galvanneal Coatings on IF Steel Sheets.

An Alternative Method to Calculate Processing Variables for the Galvannealing Process.

“…(2) The data obtained in step 1 are fitted by a simple isothermal model: [7][8][9][10][11][12][13][14][15] WϭW 0 ϩ(W S ϪW 0 )(1Ϫexp(Ϫkt))................. (1) where W is the coating iron content, W S is a saturation coating iron content and W 0 is the initial coating iron content, all in mass%. From such a fitting, k and W S are obtained.…”

Effect of the Steel Substrate on the Kinetics of Iron Enrichment and on the Processing Variables of Hot-dip Galvannealed Coatings on Steel Sheets.

“…In a series of works [1][2][3][4][5][6][7][8][9][10] both the isothermal and non-isothermal kinetics of iron enrichment of the zinc coating have been quantitatively modeled taking into account factors such as coating mass and aluminum content. That modeling was combined with the time-temperature path followed by the moving sheet during the galvannealing cycle.…”

“…From such a fitting k and W S are obtained and their values are given in Table 1. More details can be found in Lopes et al 10) It is worth mentioning that this model has been used successfully to describe the kinetics of the iron enrichment on previous works [1][2][3][4][5][6]8,10) but it is a phenomenological model. It does not explicitly take into account the nucleation/growth mechanism of the individual phases.…”

“…In order to do this one can use one of the two methods suggested by Seixas and Rios 1,6) : additivity and integration of the kinetic law. In this work the direct integration of the kinetic law was chosen as it was easier than the additivity method used by Lopes et al 10) .…”

Modeling the Coating Iron Content as a Function of Small Changes of Processing Variable in Hotdip Galvannealed Coasting on IF Steel Sheets.

“…Therefore it is of considerable interest to understand and to quantify the evolution of the coating iron content as a function of processing variables during the galvannealing process. In previous works [1][2][3][4][5][6][7][8][9][10] the kinetics of iron enrichment for the zinc coating of IF steel sheets has been quantitatively modeled taking into account two "chemical" processing variables, namely, coating mass and aluminum content. This modeling was combined with the time-temperature path followed by the moving sheet during the galvannealing cycle.…”