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Meeting Materials Science & Technology 2019
Symposium Retained Austenite for High and Ultrahigh Strength Steels
Presentation Title Effect of Nickel on Austenite Stabilization during Quenching and Partitioning Process in Medium-Mn Steels
Author(s) Sudhindra Ayenampudi, Carola Celada Casero, Jilt Sietsma, Maria Santofimia Navarro
On-Site Speaker (Planned) Sudhindra Ayenampudi
Abstract Scope Austenite stabilization through partitioning of alloying elements from martensite into austenite is a key aspect in the Q&P process. In the current research, two low carbon, medium manganese steels with varying content of nickel, strong austenite stabilizer, are investigated to elucidate the influence of nickel on austenite stability. After partitioning at 400 C and 600 C, retained austenite fractions in the final microstructures rise with increasing holding time. In contrast, intermediate partitioning temperature of 500 C promotes pearlite and carbide formation in austenite, that compete for the carbon available for partitioning, and decrease the retained austenite fractions with time. Results indicate that the addition of nickel slow down the kinetics of competitive reactions during the partitioning stage and significantly increases the fraction of retained austenite. The current in-detail study on the impact of nickel on austenite stability provides new strategies to tailor the Q&P microstructure in this family of alloys.
Proceedings Inclusion? Definite: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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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