Effect of Cyclic Cryogenic Treatment on Wear Resistance, Impact Toughness, and Microstructure of 42CrMo Steel and Its Optimization

Figure 9

SEM micrographs of fracture surfaces of (a) CHT specimens and CT specimens treated for (b) 2 h, (c) 12 h, and (d) 24 h.

(a)

(b)

(c)

(d)