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

Figure 2

Optical microstructures of the weld metal and after reheating at 990°C: (a) Steel A as-weld; (b) Steel A reheating; (c) Steel B reheating; (d) Steel C reheating.

(a)

(b)

(c)

(d)