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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.


Application of Room-temperature Quenching and Partitioning on Medium Mn Steel
Austenite Stability in Bainite Steel After Austempering Heat Treatments
Carbon Partitioning between Ferrite and Austenite in Medium-Mn Steel and its Impact on Mechanical Properties
Effect of Nickel on Austenite Stabilization during Quenching and Partitioning Process in Medium-Mn Steels
Medium-carbon TRIP-aided Bainitic Ferrite Steels
Novel Concepts for Tough Ductile Ultra-High Strength Martensitic / Bainitic Steels Containing Finely Divided Retained Austenite
P3-94: The Relationships between Tensile Behavior and Hole Expansion Property of TRIP-aided Steels
Retained Austenite in Nanobainite Bearing Steel After Austempering Heat Treatments
Tensile Deformation Characteristics and Austenite Transformation Behavior of Advanced High Strength Steel Considering Adiabatic Heating

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