Metallographic Investigation on Postweld Heat-Treated0.21%C-1020 Steel Plates Joined by SMAW Method

Figure 8

Polished welded plates and microstructures. (a, b) sand-cooled samples with coarse pearlite; (c) water-cooled sample with martensite formation; (d, e) oil-cooled sample possesses both pearlite and martensite as well as cementite-mix region; (f, g) air-cooled sample with lamellar structure of pearlite regions.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)