Abstract
Abstract Japanese sword are understood that they contain martensite and could not be produced without tamahagane steel by tatara process. A newly produced sword (short sword) prepared from tamahagane steel using traditional forge-folding ( tatara ) method was examined by optical microscopy and SEM/EBSD method for observing the microstructural features in it. It was found that the microstructure of the sword was martensite with lath type morphology. The feature of lath martensite was characterized by observing the prior austenite grain, packet and block boundaries with respect to their linearity and curviness. Thus a new method of comparison between tatara steel and ordinary Fe–C steel was mentioned by measuring the curved line and the straight line contained in the boundaries corresponding to the prior austenite grains, packets and blocks.
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