| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced High Strength Steels IV
|
| Presentation Title |
J-2: Excellent Strength-ductility Combination of
Austenitic-hadfield/martensitic-hot-press-forming Clad Steel Sheet |
| Author(s) |
Min Cheol Jo, Jaeyeong Park, Seok Su Sohn, Taejin Song, Hyoung Seop Kim, Sunghak Lee |
| On-Site Speaker (Planned) |
Min Cheol Jo |
| Abstract Scope |
An austenitic Hadfield steel shows excellent tensile strength and ductility as well as highly-sustained strain hardening, but its yield strength is relatively low. In order to overcome this shortcoming, a multi-layer clad steel sheet was fabricated by the hot-roll-bonding with martensitic hot-press-forming (HPF) steels. Carburized and decarburized layers were formed near Hadfield/HPF interfaces by the C diffusion from the high-C Hadfield (1.2%) to low-C HPF (0.23%) layers. This clad sheet was fractured right after the yielding because the intergranular fracture appeared in the carburized layer. The tempering at 200 °C was adopted for relieving residual stress and the 200 °C-tempered clad sheet showed dramatically improved tensile properties over the non-tempered clad sheet. This simultaneous enhancement of strength and ductility was explained by a multi-layer effect induced from populated twin formation, generation of geometrically necessary dislocations, and increase of back stress inside thin interfacial layers. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |