Microstructure and Hardness of Cold Work Vanadis 6 Steel after Subzero Treatment at −140°C

Figure 3

SEM micrographs showing the microstructure of Vanadis 6 steel (a) after CHT, (b) after SZT at −140°C for 4 h, (c) after SZT at −140°C for 24 h, and (d) after SZT at −140°C for 48 h.

(a)

(b)

(c)

(d)