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Meeting Materials Science & Technology 2019
Symposium Retained Austenite for High and Ultrahigh Strength Steels
Presentation Title Austenite Stability in Bainite Steel After Austempering Heat Treatments
Author(s) Giovani Goncalves Ribamar, Arthur Seiji Nishikawa, Hélio Goldenstein
On-Site Speaker (Planned) Giovani Goncalves Ribamar
Abstract Scope In order to study the stability of retained austenite (RA), a Fe-Cr-C steel was submitted to austempering heat treatments. Bainitic kinetics and bainite transformed volume fraction were determined by dilatometry analysis. The obtained austenite decomposition products were characterized by Scanning Electronic Mycroscopy (MEV), X-ray diffraction in order to quantify RA and estimate its carbon content, and Vickers microhardness test. The results showed that total dilation for the times studied decreased with the increase in austempering temperature. Martensite transformation during final quenching (after austempering) was observed for the highest austempering temperatures, while it was not found for those at lower temperatures. The results suggest that RA becomes more stable for low temperatures due to carbon enrichment and the small amount of austenite. At high temperatures, a large amount o austenite stays untransformed and the partitioned carbon content is not enough to stabilize RA.


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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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