U.S. Department of Energy Office of Scientific and Technical Information
Elucidating the temperature dependence of TRIP in Q&P steels using synchrotron X-Ray diffraction, constituent phase properties, and strain-based kinetics models
Understanding the deformation-induced martensitic transformation (DIMT) is critical for interpreting the structure-property relationships that govern the performance of transformation-induced plasticity (TRIP) assisted steels. However, modern TRIP-assisted steels often exhibit DIMT kinetics that are not easily captured by existing empirical models based on bulk tensile strain. We address this challenge by combined bulk uniaxial tensile tests and in-situ high energy synchrotron X-ray diffraction, which resolved the phase volume fractions, stress-strain response, and microstructure evolution of each constituent phase. A modification of the Olson-Cohen model is implemented, which describes the martensitic transformation kinetics as a function of the estimated partitioned strain in austenite, rather than the bulk tensile strain. This DIMT kinetic model is used as a framework to clarify the root cause of an insufficiently understood toughness trough reported for TRIP-assisted steels during deformation at elevated temperatures. Here, the importance of the temperature-dependent toughness is discussed, based on the opportunity to modify deformation processes to tailor the DIMT kinetics and mechanical properties during forming and in service.
Finfrock, Christopher B., et al. "Elucidating the temperature dependence of TRIP in Q&P steels using synchrotron X-Ray diffraction, constituent phase properties, and strain-based kinetics models." Acta Materialia, vol. 237, Jul. 2022. https://doi.org/10.1016/j.actamat.2022.118126
Finfrock, Christopher B., Ellyson, Benjamin, Likith, Sri Ranga Jai, Smith, Douglas, Smith, Douglas, Saville, Alec I., Thrun, Melissa M., Becker, C. Gus, Araujo, Ana L., Pavlina, Erik J., Hu, Jun, Park, Jun-Sang, Clarke, Amy J., & Clarke, Kester D. (2022). Elucidating the temperature dependence of TRIP in Q&P steels using synchrotron X-Ray diffraction, constituent phase properties, and strain-based kinetics models. Acta Materialia, 237. https://doi.org/10.1016/j.actamat.2022.118126
Finfrock, Christopher B., Ellyson, Benjamin, Likith, Sri Ranga Jai, et al., "Elucidating the temperature dependence of TRIP in Q&P steels using synchrotron X-Ray diffraction, constituent phase properties, and strain-based kinetics models," Acta Materialia 237 (2022), https://doi.org/10.1016/j.actamat.2022.118126
@article{osti_1877139,
author = {Finfrock, Christopher B. and Ellyson, Benjamin and Likith, Sri Ranga Jai and Smith, Douglas and Smith, Douglas and Saville, Alec I. and Thrun, Melissa M. and Becker, C. Gus and Araujo, Ana L. and Pavlina, Erik J. and others},
title = {Elucidating the temperature dependence of TRIP in Q&P steels using synchrotron X-Ray diffraction, constituent phase properties, and strain-based kinetics models},
annote = {Understanding the deformation-induced martensitic transformation (DIMT) is critical for interpreting the structure-property relationships that govern the performance of transformation-induced plasticity (TRIP) assisted steels. However, modern TRIP-assisted steels often exhibit DIMT kinetics that are not easily captured by existing empirical models based on bulk tensile strain. We address this challenge by combined bulk uniaxial tensile tests and in-situ high energy synchrotron X-ray diffraction, which resolved the phase volume fractions, stress-strain response, and microstructure evolution of each constituent phase. A modification of the Olson-Cohen model is implemented, which describes the martensitic transformation kinetics as a function of the estimated partitioned strain in austenite, rather than the bulk tensile strain. This DIMT kinetic model is used as a framework to clarify the root cause of an insufficiently understood toughness trough reported for TRIP-assisted steels during deformation at elevated temperatures. Here, the importance of the temperature-dependent toughness is discussed, based on the opportunity to modify deformation processes to tailor the DIMT kinetics and mechanical properties during forming and in service.},
doi = {10.1016/j.actamat.2022.118126},
url = {https://www.osti.gov/biblio/1877139},
journal = {Acta Materialia},
issn = {ISSN 1359-6454},
volume = {237},
place = {United States},
publisher = {Elsevier},
year = {2022},
month = {07}}
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR); National Science Foundation Graduate Research Fellowship
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 582, Issue 1https://doi.org/10.1016/j.nima.2007.08.103