Figure 2

(a) Variant map of a specimen cooled at 77 K. The boundary of prior austenite grain is depicted by a dashed line. Black framed region is enlarged in (g). The normal direction-vertical direction-horizontal direction (ND-VD-HD) is shown in the inset. (b) PG map of the specimen cooled at 77 K. (c) Spatial distribution of variants belonging to PG(\(\bar{1}\)01) with lengths exceeding 5 µm. Simulated (001) cross sections of a diamond cluster are shown in the inset. (d) 100 _M PF of the martensite variants. (e) Positions of the 100 _M poles of 24 variants when the martensite satisfies the K–S OR. (f) 100 _M PF for the variants shown in (g) and positions of theoretical 100 _M poles (K–S OR). (g) Variant map of the PG(\(\bar{1}\)10) in the black framed region in (a) and (b). (h) Observed frequency of variant pairs.