铁素体

例句：

1. 1. The steel is made from iron and carbon, with the presence of austenite in the iron matrix.
   这种钢是由铁和碳制成，其中存在奥氏体。
2. 2. The microstructure of the steel is characterized by the presence of ferrite grains.
   这种钢铁的微观结构特征是存在铁素体晶粒。
3. 3. In the manufacturing process, the transformation of iron into steel involves the formation of austenite and subsequent transformation to ferrite.
   在制造过程中，将铁转化为钢涉及形成奥氏体并随后转变为铁素体。