| Title |
Special Edition : Symposium on Mechanical Behavior of Materials(1) ; Modeling of Flow Stress and Micro-structural Variations in Strain Induced Dynamic Transformation of Low Carbon Steel by Hot Torsion Deformation |
| Authors |
안재영(Jae Young An); 권영재(Young Jae Kwon); 이덕락(Duk Lak Lee); 김성일(Sung Il Kim); 유연철(Yeon Chul Yoo) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Hot deformation; Strain induced dynamic; Transformation; Prediction of flow stress; Critical strain |
| Abstract |
The relationships between flow stress curve and microstructure evolution of strain induced dynamic phase transformation (SIDT) using low carbon steel (0.22wt.%) were quantitatively investigated. The deformation was carried out at just above Ar3 temperature (710℃) as a function of strain rate (0.0l-5/sec). The softening process of SIDT was well modeled based on Avrami and constitutive equations similar to the existing dynamic recrystallization process. However, the calculated results differed from the experimental curve as decreased the strain rate under 0.2/ sec, this is due to that the dynamic transformation from austenite to ferrite is not completed by lower deformation stored energy. |