Powdering in Coating Layer of Galvannealed Nb-Ti Free Extra Low Carbon Steel Sheet
We have studied the fracture behavior of coating layer when low and high alloying galvannealed (GA) steels are subject to forming process. To understand better powdering features in the coating layer of the steel sheets, we carried out V-bending test and a series of finite element analysis which simulates damage characteristics in the coating layer. Results showed that the powdering behavior in the coating is significantly affected by the soundness and volume fraction of phases in the coating layer. The hardness variation of coating layers attributed to different phases leads to different deformation behavior of the coating layer itself.
S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim
S.I. Kim et al., "Powdering in Coating Layer of Galvannealed Nb-Ti Free Extra Low Carbon Steel Sheet", Key Engineering Materials, Vols. 345-346, pp. 1089-1092, 2007