About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Understanding of Martensite in Steels III
|
| Presentation Title |
Effect of Volume Fraction and Mechanical Stability of Retained Austenite on Strain Hardening Behaviour of Fe-0.2C-5Mn-0.8Si-0.4Al Medium Mn Steel. |
| Author(s) |
Kamal Kumar Gupta, Shiv Brat Singh |
| On-Site Speaker (Planned) |
Kamal Kumar Gupta |
| Abstract Scope |
The ultra-fine microstructure of austenite and ferrite in cold rolled and inter-critical annealed medium Mn steel show high strength and ductility but also display yield point elongation. The high strain hardening due retained austenite to martensite transformation (TRIP effect) is mainly responsible delayed necking and improved formability. The improvement in strain hardening is controlled by mechanical stability of austenite which depends on numbers of factor such as composition, grain size and yield strength of austenite. Therefore, optimum stability of retained austenite is required to improve strain hardening by controlling temperature and time of inter-critical annealing along with amount of cold deformation, one step or two steps inter critical annealing. The change in inter-critical process temperature and time along with initial ferrite microstructure has influence on austenite morphology , grain size and affect Mn partitioning to austenite which decreases stacking fault energy and thus enhances TRIP effect.
|