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

Figure 11

SEM micrographs of fracture surfaces of (a) CHT specimen and CT specimens treated for (b) 2 h (CT7), (c) 12h (CT8), and (d) 24 h (CT9) at −196°C.

(a)

(b)

(c)

(d)