Abstract
A strain distribution introduced by tensile deformation in a ferrite + martensite multilayered steel was visualized using the digital image correlation method and its local deformation and fracture behavior were characterized. The strain was continuously distributed along 45 degrees from the tensile direction regardless of the layers and was predominately to concentrate in martensite layers. Voids or cracks were generated from highly strained martensite layers and their coalescence led to the fracture. Therefore, the deformability and ductility of hard layer play an important role in the deformation and fracture in a multilayered steel.
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