Intro 上游充道大粤 SHANGHAI JIAO TONG UNIVERSITY Heat treatment process for hardening of steel? √Quenching! Rapid enough from the austenitic phase field> insufficient time for diffusion-controlled decomposition processes to occur Transform to martensite!>Diffusionless transformation! NG UNN Where will be the C atoms? > Solid solution of C in fcc y-Fe>Solid solution of C in a-Fe (Supersaturated!) K.Chen 3K. Chen Heat treatment process for hardening of steel?  Quenching!  Rapid enough from the austenitic phase field  insufficient time for diffusion-controlled decomposition processes to occur  Transform to martensite!  Diffusionless transformation!  Where will be the C atoms?  Solid solution of C in fcc γ-Fe Solid solution of C in α-Fe (Supersaturated!) 3 Intro