Fig. 1 Geometry and dimensions of the tensile test specimen

Fig. 2 IQ map of the microstructure of DP600 steel

Fig. 3 Engineering stress-strain curve of DP600 steel

Fig. 4 SEM micrograph of the fracture surface of DP600 steel

Fig. 5 a SEM micrograph of the cross section of fractured specimen. b Variation of logarithmic thickness strain with distance from the fracture surface

Fig. 6 SEM micrograph of the microstructure of the cross section of the tensile-tested specimen at the position of the equivalent logarithmic strain of 0.15, a SE image, b BSE image. Arrows show the location of voids

Fig. 7 SEM micrographs of the microstructures of the cross section of the tensile-tested specimen at the position of the equivalent logarithmic strain of 0.4, a SE image, b BSE image. Arrows show the formation of voids as a result of martensite necking (a), martensite fracturing (b)

Fig. 8 KAM maps of DP600 steel microstructures at equivalent logarithmic strain of a un-deformed sample, b 0.15, c 0.4

Fig. 9 Distribution of KAM values at different strain levels

Fig. 10 GAM maps of DP600 steel microstructures at different equivalent plastic strains: a un-deformed sample, b 0.15, c 0.4