Transformation of M/A Constituents during Tempering and Its Effects on Impact Toughness of Weld Metals for X80 Hot Bends

Figure 6

Optical microstructures of the weld metals tempered at different temperatures. Bend A: (a) 480°C; (b) 550°C; (c) 600°C. Bend B: (d) 550°C; (e) 620°C; (f) 680°C. Bend C: (g) 550°C; (h) 620°C; (i) 680°C.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)