Effect of Chromium on Microstructure and Texture in Hot-Dipped Al-Cr Steel Sheet

摘要

Microstructure and texture changes of aluminized coatings on steel sheets having Cr ranging from 0.0 percent to 1.0 percent in the coated layer were investigated. The surface morphology of the Al-Cr coated steel is not influenced by the increase of Cr contents in the coated layer. While the coated layer of aluminized steel consisted of two phases of Al and Al_5Fe_2, the aluminized coating layer containing Cr was composed of three phases of Al, Al_(13)Cr_2, and Al_(13)Fe_4 + Al_5Fe_2. The surface layer was Al, the middle layer was Al_(13)Cr_2, and the interfacial layer between the coating and the steel substrate was Al_(13)Fe_4 and Al_5Fe_2. The texture of the aluminized coating without Cr was characterized as a {001} fiber texture which major orientation was {001} <110>. As the Cr content in the aluminized layer was increased to 1.0 percent, the texture of the aluminized coating was not changed but the intensity of the {001} fiber texture was increased. The major orientation in the {001} fiber texture was changed from the rotated cube orientation of the aluminized coating with 0.1 percent Cr to the cube orientation of the aluminized coating with 1.0 percent Cr.