Determination of Susceptibility to Intergranular Corrosion of UNS 31803 Type Duplex Stainless Steel by Electrochemical Reactivation Method: A Comparative Study

Figure 2

Optical micrographs obtained after ageing at 800°C by etching with NaOH reagent. (a) 100 min, (b) 316 min, (c) 1000 min, (d) 3162 min, (e) 10000 min, (f) 31622 min, (austenite in white, ferrite in gray, sigma precipitates in black).

(a)

(b)

(c)

(d)

(e)

(f)