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Multi length scale characterization of austenite in TRIP steels using high-energy X-ray diffraction

Published online by Cambridge University Press:  18 April 2013

R. Blondé ,
E. Jimenez-Melero ,
L. Zhao ,
J.P. Wright ,
E. Brück ,
S. van der Zwaag  and
N.H. van Dijk
R. Blondé*
Affiliation:
Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands Materials Innovation Institute, Mekelweg 2, 2628 CD Delft, The Netherlands
E. Jimenez-Melero
Affiliation:
Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands Dalton Cumbrian Facility, University of Manchester, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HA, United Kingdom
L. Zhao
Affiliation:
Materials Innovation Institute, Mekelweg 2, 2628 CD Delft, The Netherlands Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands
J.P. Wright
Affiliation:
European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP 220, 38043 Grenoble, Cedex, France
E. Brück
Affiliation:
Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands
S. van der Zwaag
Affiliation:
Novel Aerospace Materials Group, Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands
N.H. van Dijk
Affiliation:
Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands
*
a)Author to whom correspondence should be addressed. Electronic mail: R.J.P.Blonde@tudelft.nl
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Abstract

The martensitic transformation behavior of the meta-stable austenite phase in low alloyed TRIP steels has been studied in situ using high-energy X-ray diffraction during deformation. The stability of austenite has been studied at different length scales during tensile tests and at variable temperatures down to 153 K. A powder diffraction analysis has been performed to correlate the macroscopic behavior of the material to the observed changes in the volume fraction of the phases. Our results show that at lower temperatures the deformation induced austenite transformation is significantly enhanced and extends over a wider deformation range, resulting in a higher elongation at fracture. To monitor the austenite behavior at the level of an individual grain a high-resolution far-field detector was used. Sub-grains have been observed in austenite prior to transformation.

Keywords

in situ high-energy X-ray diffractionTRIP steelaustenitemartensite
Type
Technical Articles
Information
Powder Diffraction , Volume 28 , Issue 2 , June 2013 , pp. 77 - 80
Copyright
Copyright © International Centre for Diffraction Data 2013 

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