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Meeting Materials Science & Technology 2020
Symposium Bulk and Sheet Thermal-Deformation Processing and Microstructure Development in Metals – Characterization, Experiments and Modeling
Presentation Title Austenite Stability and Strain Localization in Q&P Steels Deformed at Dynamic Strain Rates
Author(s) Christopher Barret Finfrock, Trevor Ballard, Gus Becker, John Copley, Benjamin Ellyson, Melissa Thrun, Jonah Klemm-Toole, Amy Clarke, Kester Clarke
On-Site Speaker (Planned) Christopher Barret Finfrock
Abstract Scope Successful application of the quenching and partitioning (Q&P) process using commercial production equipment has led to promising combinations of strength and ductility. This noteworthy mechanical performance is caused by the TRIP effect, whereby the deformation induced transformation of austenite to martensite suppresses strain localization. Predicting the deformation response of Q&P steels at the dynamic rates reached during stamping operations and crash scenarios remains a significant challenge, because the austenite transformation is inherently sensitive to temperature, strain rate, and strain path. Recent studies have reported variations in toughness at elevated strain rates and temperatures. To determine the cause of this behavior, interrupted mechanical testing and synchrotron experiments were performed, to quantify the extent of the austenite transformation over a range of strain rates and temperatures. In this talk, potential causes for the shift in deformation behavior, such as strain rate sensitivity and adiabatic heat accumulation, are evaluated in the context of the martensite transformation.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Austenite Stability and Strain Localization in Q&P Steels Deformed at Dynamic Strain Rates
Characterisation of static recrystallisation and grain growth in designed gradient microstructures: a pathway to high-throughput microstructural testing?
Continuum Dislocation Dynamics-based Modeling of the Strain Hardening Behavior of ECAPed Aluminum Alloy
Microstructure and Mechanical Properties of Diffusion Bonded IN740H
Probing Differences in Processing and Texture in FCC/BCC Nanolaminates Fabricated via Accumulative Roll Bonding

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