Formation Mechanism 上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY F FeC A Undissolved Fe3C Undissolyed Four steps: 1.Austenite nucleation AO TONG UNIVE 2.Nuclei growth 3.Dissolution of remaining Fe3C 4.Homogenization of austenite K.Chen 12K. Chen Formation Mechanism 12 Four steps: 1. Austenite nucleation 2. Nuclei growth 3. Dissolution of remaining Fe3C 4. Homogenization of austenite Undissolved Fe3C Undissolved Fe3C