Investigation of controlling factor of martensite lath size from the view point of local elastic - plastic accommodation

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In the present study, interaction between lath martensite transformation and plastic deformation in austenite matrix, which is supposed to affect structure size of lath martensite, has been investigated. Quantitative analysis of strain mapping around martensite lath revealed that shape strain during lath formation is mostly accommodated by plastic deformation in austenite, leading to inhomogeneous lattice rotation in austenite adjacent to martensite. Such deformation in austenite would inhibit further growth of martensite lath. It was found that prior deformation of austenite to martensite transformation reduces variant size of lath martensite without change in size of each lath although specific variants are nucleated preferentially on the dislocation structure in austenite.