Effects of Cr and Zn on the interfacial microstructures of borides in Fe–Cr–B cast steels during hot-dipping in Al–Zn alloys

Abstract

Abstract The interfacial microstructures of borides in Fe–Cr–B cast steels with different Cr contents after hot dipping in Al–Zn alloys were investigated. The results showed: the Cr contained in Fe–Cr–B cast steel had a key influence on the formation of periodic layered structures (PLSs) between Cr-rich borides, which were (Cr,Fe)2B, and Al–Zn melt. The contents of Zn in the Al–Zn melts also significantly influenced the formation of periodic layered structures, which depended on the complex relationship between the content of Cr contained in Fe–Cr–B cast steel and that of Zn in Al–Zn melt. Within a certain range, the higher the content of Cr is, the larger the maximum value of Zn in Al–Zn melt that could form PLS at the (Cr,Fe)2B/Al–Zn interface could be.