Abstract: In order to improve the powdering resistance of galvannealed coating， the effects of substrate steel crystallographic features on the galvannealed (GA) coating phase structure and powdering behavior were studied. The results show that γ texture can improve the formability of substrate and retrain the crack propagation of coating. The presence of (111)-(113)-(313)//RP at the top of the substrate promotes the formation of δ phase. However， ζ phase with high growth rate are formed on (001)-(101)//RP of substrate steel. ζ phase is transformed into δ phase and finally transformed into Γ phase during the galvannealed processes and led to different phase structures， thus affecting powdering properties and adhesive between coating and substrate. Additionally， both the ratio of volume fraction of 113〈110〉to that of 111〈110〉， and the fraction of high (low) energy boundaries play a vital role in the formation and growth of Fe-Zn intermetallic phase.

Key words: galvannealed coating, crystallographic features, powdering resistance, coating phase structure