Relationships Between the Phase Transformation Kinetics, Texture Evolution, and Microstructure Development in a 304L Stainless Steel Under Biaxial Loading Conditions: Synchrotron X-ray and Electron Backscatter Diffraction Studies

Ercan Cakmak, Hahn Choo, Jun Yun Kang, Yang Ren

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Abstract

The relationships between the martensitic phase transformation kinetics, texture evolution, and the microstructure development in the parent austenite phase were studied for a 304L stainless steel that exhibits the transformation-induced plasticity effect under biaxial loading conditions at ambient temperature. The applied loading paths included: pure torsion, simultaneous biaxial torsion/tension, simultaneous biaxial torsion/compression, and stepwise loading of tension followed by torsion (i.e., first loading by uniaxial tension and then by pure torsion in sequence). Synchrotron X-ray and electron backscatter diffraction techniques were used to measure the evolution of the phase fractions, textures, and microstructures as a function of the applied strains. The influence of loading character and path on the changes in martensitic phase transformation kinetics is discussed in the context of (1) texture-transformation relationship and the preferred transformation of grains belonging to certain texture components over the others, (2) effects of axial strains on shear band evolutions, and (3) volume changes associated with martensitic transformation.

Original languageEnglish
Pages (from-to)1860-1877
Number of pages18
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume46
Issue number5
DOIs
StatePublished - May 2015

Funding

This research was supported in part by the NSF Major Research Instrumentation (MRI) program under contract DMR.0421219. Use of the APS was supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy, under Contract No. DE-AC02-06CH11357. The sample preparation at Oak Ridge National Laboratory was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. E.C. and H.C. acknowledge K. An and H. Skorpenske (Oak Ridge National Laboratory) for their help using the VULCAN load frame and D. Fielden (University of Tennessee) for machining the specimens. E.C. is grateful for Y. Wang’s help performing the VPSC modeling and for the 2012 and 2013 Ludo Frevel Crystallography Scholarship Awards from the International Center for Diffraction Data (ICDD).

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