Which microstructure predominantly contains iron carbide in 18-8 stainless steel?

Explanation

In 18-8 stainless steel, the primary phase is austenite, which is a face-centered cubic structure that can contain iron carbide. Martensite and ferrite are different microstructures, and pearlite is a lamellar mixture of ferrite and cementite, not typical in 18-8 stainless steel.