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Meeting Materials Science & Technology 2019
Symposium Retained Austenite for High and Ultrahigh Strength Steels
Presentation Title Retained Austenite in Nanobainite Bearing 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 influence of silicon and manganese contents on austempering heat treatment of bearing steels, a Fe-1C-1.0Mn-1.8Si-1.5Cr (alloy A) and a Fe-1C-1.5Mn-1.2Si-1.5Cr (alloy B) steels were submitted to austempering heat treatments above martensite start temperature. Bainite formation kinetics and bainite transformed volume fraction were determined by dilatometry analyses. The austenite decomposition products were characterized by Scanning Electron Microscopy with Field Emission Gun (FEG). X-ray diffraction was carried out to quantify the amount of retained austenite. The strength for each treatment condition and alloy was estimated by Vickers microhardness test. The results showed that alloy A presented slower bainite formation kinetics than alloy B, reaching complete bainite transformation only for times higher than 10 h for temperatures close to 300 °C. The morphology of the austenite decomposition products presented nanostructured bainitic ferrite sheaves containing thin austenite films, of the order of 80 nm in thick.


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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