The martensite phase. such as ferromagnetic. can be created in 5US304 stainless steel by plastic deformation near the part with high dislocation density. The information about dislocation density can be obtained by the magnetic measurement techniques accurately. The occurence of martensite transformation however. depends on various factors such as dislocation density. grain boundaries. chemical composition, external stress and temperature. The first three factors are material related and the last two are external factor. The relationship between these factors should he made clear. The role of grain boundaries are investigated in the present study. The grain boundaries are obstacles for the dislocation motion. At the same time the grain boundary makes the austenite state stable. The coercive force provides us the information on the shape of the martensitic phase.
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