Duplex stainless steel, IC378, hot rolled in the direction indicated. The darker etching phase is ferrite and the remainder is austenite
Duplex stainless steel IC381 (dark phase is ferrite).
Duplex stainless steel IC381 (dark phase is ferrite).
Superduplex stainless steel A219 after heat treatment at 1150 centigrade for 2.5 h. The austenite is yellow and ferrite is dark brown, with the sigma phase white.