A study of microstructure,transformation mechanisms and correlation between microstructure and mechanical properties of a low alloyed TRIP steel |
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| Affiliation: | 1. Microstructure Physics and Metal Forming, Max-Planck-Institute for Iron Research, Max-Planck-Strasse 1, Düsseldorf 40237, Germany;2. SMS Demag AG, Hilchenbach, Germany;3. Department of Ferrous Metallurgy, RWTH Aachen, Germany;1. Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany;2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA;1. Department of Materials Science and Engineering, Ghent University, Technologiepark 903, B-9052 Zwijnaarde (Ghent), Belgium;2. Department Material Science and Engineering, TUDelft, Mekelweg 2, NL-2628 CD Delft, The Netherlands;3. ArcelorMittal Global R&D Gent, President J.F. Kennedylaan 3, B-9060 Zelzate, Belgium;1. Shenzhen Institute of Research and Innovation, The University of Hong Kong, Shenzhen, China;2. Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China;3. State Key Laboratory of Advanced Metallurgy & School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xue Yuan Lu 30, Beijing 100083, China;1. Max-Planck-lnstitut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany;2. Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany;1. Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), UMR 7239, CNRS/Université de Lorraine, F-57045 Metz, France;2. Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (“LabEx DAMAS”), Université de Lorraine, France |
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| Abstract: | Differently heat treated samples of a low alloyed TRIP steel have been investigated using electron diffraction techniques in SEM and TEM. Aim was, first, to discriminate the microstructure constituents, austenite, ferrite, bainite, and martensite, second to gain information on the γ–α phase transformation mechanisms and third to correlate the mechanical properties and the microstructure of the samples. Bainite always occurs in conjunction with an orientation gradient in the surrounding ferrite matrix. It consists of fine lamellae of ferrite and austenite which show a sharp Kurdjumov–Sachs orientation relationship with each other. This was interpreted in terms of a displacive bainite formation mechanism. The microstructure is formed by growth of γ-grains during intercritical annealing and shrinking of these grains during the subsequent cooling without nucleation of new α-grains. The transformation first occurs reconstructively into ferrite and then, at lower temperature, displacively into bainite. The mechanical properties of differently heat treated samples are most strongly influenced by the amount and distribution of carbon in the retained austenite and by the degree of recovery in bainite and austenite. |
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