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Meeting Materials Science & Technology 2019
Symposium Retained Austenite for High and Ultrahigh Strength Steels
Presentation Title Carbon Partitioning between Ferrite and Austenite in Medium-Mn Steel and its Impact on Mechanical Properties
Author(s) Yan Ma, Binhan Sun, Wenwen Song, Wolfgang Bleck
On-Site Speaker (Planned) Wolfgang Bleck
Abstract Scope In the present work, the influence of cooling conditions, namely water-quenching (WQ) and air-cooling (AC), on medium-Mn steel Fe-12Mn-3Al-0.05C (wt%) was investigated. The synchrotron XRD experiments showed that the cooling conditions after intercritical annealing had a neglected effect on the amount of retained austenite. The atom probe tomography investigation showed that there was no obvious carbon enrichment at phase boundaries of ferrite and austenite in the WQ specimen, while carbon atoms strongly enriched at phase boundaries in the AC specimen. Consequently, the WQ specimen exhibited continuous yielding behavior, while AC specimen manifested discontinuous yielding behavior. The yield strength increased by ~ 80 MPa by AC. At the same time, the uniform elongation of the AC specimen was ~ 5% higher than that of the WQ specimen. The results indicate that cooling conditions have a strong influence on carbon redistribution, the mechanical stability of retained austenite and strain-hardening behavior.


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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