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

Figure 10

SEM micrographs of (a) CHT specimen and CT specimens treated at (b) −120°C (CT3), (c) −160°C (CT6), and (d) −196°C (CT9) for 24 h.

(a)

(b)

(c)

(d)