About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
2024 Technical Division Student Poster Contest
|
Presentation Title |
SPG-58: Assessment of Strength-ductility Balance, Strain Hardening, and Fracture of Massive Ferrite in Ti-stabilized Interstitial-free Steel |
Author(s) |
Sandeep Yadav, Sadhan Ghosh |
On-Site Speaker (Planned) |
Sandeep Yadav |
Abstract Scope |
A diffusional transformation of austenite into allotriomorphic ferrite makes interstitial-free steel soft-ductile. This work utilizes non-equilibrium sample processing to alter microstructure and mechanical properties via austenitization treatment at 925°C for 5 minutes, followed by rapid cooling, resulting in massive ferrite. The yield strength (86 MPa) and ultimate tensile strength (181 MPa) are enhanced to 362 MPa and 540 MPa, respectively, along with 18% ductility. The dramatic change in mechanical property is explained by morphological distinctions between allotriomorphic and massive ferrite. The dislocation substructure inside massive ferrite contributes to the high yield strength of massive ferrite. Despite the presence of substructures to impede dislocation motion, massive ferrite exhibits poorer strain-hardening over allotriomorphic ferrite. The restricted slip in the massive ferrite causes flow localization. The TiN precipitates entrapped in flow localization undergo lattice decohesion, which is the key reason for tensile failure at a higher rate over allotriomorphic ferrite. |
Proceedings Inclusion? |
Undecided |
Keywords |
Other, Other, Other |