“…5b,c). Even if one considers the underestimation of carbon fraction due to the local magnification effect of AP analysis, 23,24) the observed carbon fraction is considerably lower than those in cementite (~25 at%) and transition or -carbides (20-33 at%) 9,21,25) . It is, therefore, natural to consider that the growth of carbon clusters on dislocation occurs during RT aging in the martensite block of Specimen I.…”