Effect of Alloying Composition on Microstructure and Mechanical Properties of Ultranarrow Gap Welded Joints of U71Mn Rail Steel

Figure 9

The micromorphology of the impact fracture at different temperatures in the center of the weld. (a–c) Ductile fracture morphology and (d, e) brittle fracture morphology. (a) 20°C, (b) −20°C, (c) −40°C, 60°C, (d) −40°C, and (e) −60°C.

(a)

(b)

(c)

(d)

(e)