| About this Abstract |
| Meeting |
Materials Science & Technology 2019
|
| Symposium
|
Retained Austenite for High and Ultrahigh Strength Steels
|
| Presentation Title |
Medium-carbon TRIP-aided Bainitic Ferrite Steels |
| Author(s) |
Seong Hoon Kim, Dong-Woo Suh |
| On-Site Speaker (Planned) |
Seong Hoon Kim |
| Abstract Scope |
Microstructure and mechanical properties of medium carbon TRIP-aided bainitic ferrite steels were investigated with different Mn content. With Mn content of 1.5 wt.%, bainitic ferrite transformation was fast enough to stabilize the austenite, leading to no martensitic transformation during final cooling. However, at austempering above 400 ˚C, carbide precipitation happened in spite of the Si addition, reducing retained austenite fraction and deteriorating the tensile property. Increasing Mn content to 3.0 wt.% caused a transformation stasis at lower fraction of bainitic ferrite. The influence of Mn content on the bainitic transformation was interpreted by dissipation of free energy in the interface. Austempering and partitioning stabilized remaining austenite; an improved tensile property could be obtained even with higher Mn content. |