Paper Title:

Effect of Thermomechanical Processing on the Microstructure and Retained Austenite Stability during In Situ Tensile Testing Using Synchrotron X-Ray Diffraction of NbMoAl TRIP Steel

Periodical Solid State Phenomena (Volumes 172 - 174)
Main Theme Solid-Solid Phase Transformations in Inorganic Materials
Edited by Yves Bréchet, Emmanuel Clouet, Alexis Deschamps, Alphonse Finel and Frédéric Soisson
Pages 741-746
DOI 10.4028/www.scientific.net/SSP.172-174.741
Citation Elena V. Pereloma et al., 2011, Solid State Phenomena, 172-174, 741
Online since June 2011
Authors Elena V. Pereloma, Lai Chang Zhang, Klaus Dieter Liss, Ulf Garbe, Jonathan Almer, Thomas Schambron, Hossein Beladi, Ilana B. Timokhina
Keywords High Energy X-Ray, In Situ Tensile Test, Retained Austenite Stability, Synchrotron Diffraction, Transformation-Induced Plasticity Steel
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In this work we compare and contrast the stability of retained austenite during tensile testing of Nb-Mo-Al transformation-induced plasticity steel subjected to different thermomechanical processing schedules. The obtained microstructures were characterised using optical metallography, transmission electron microscopy and X-ray diffraction. The transformation of retained austenite to martensite under tensile loading was observed by in-situ high energy X-ray diffraction at 1ID / APS. It has been shown that the variations in the microstructure of the steel, such as volume fractions of present phases, their morphology and dimensions, play a critical role in the strain-induced transition of retained austenite to martensite.