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In situ synchrotron X-ray diffraction studies of the effect of microstructure on tensile behavior and retained austenite stability of thermo-mechanically processed transformation induced plasticity steel

Yan, Kun, Liss, Klaus-Dieter, Timokhina, Ilana B. and Pereloma, Elena V. 2016, In situ synchrotron X-ray diffraction studies of the effect of microstructure on tensile behavior and retained austenite stability of thermo-mechanically processed transformation induced plasticity steel, Materials science and engineering A, vol. 662, pp. 185-197, doi: 10.1016/j.msea.2016.03.048.

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Title In situ synchrotron X-ray diffraction studies of the effect of microstructure on tensile behavior and retained austenite stability of thermo-mechanically processed transformation induced plasticity steel
Author(s) Yan, Kun
Liss, Klaus-Dieter
Timokhina, Ilana B.
Pereloma, Elena V.
Journal name Materials science and engineering A
Volume number 662
Start page 185
End page 197
Total pages 13
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-04-26
ISSN 0921-5093
Keyword(s) transformation-induced plasticity steel
austenite to martensite transformation
synchrotron x-ray diffraction
high-energy x-rays
transmission electron microscopy
Summary Transmission electron microscopy and in situ synchrotron high-energy X-ray diffraction were used to investigate the martensitic transformation and lattice strains under uniaxial tensile loading of Fe-Mn-Si-C-Nb-Mo-Al Transformation Induced Plasticity (TRIP) steel subjected to different thermo-mechanical processing schedules. In contrast with most of the diffraction analysis of TRIP steels reported previously, the diffraction peaks from the martensite phase were separated from the peaks of the ferrite-bainite α-matrix. The volume fraction of retained γ-austenite, as well as the lattice strain, were determined from the diffraction patterns recorded during tensile deformation. Although significant austenite to martensite transformation starts around the macroscopic yield stress, some austenite grains had already experienced martensitic transformation. Hooke's Law was used to calculate the phase stress of each phase from their lattice strain. The ferrite-bainite α-matrix was observed to yield earlier than austenite and martensite. The discrepancy between integrated phase stresses and experimental macroscopic stress is about 300 MPa. A small increase in carbon concentration in retained austenite at the early stage of deformation was detected, but with further straining a continuous slight decrease in carbon content occurred, indicating that mechanical stability factors, such as grain size, morphology and orientation of the retained austenite, played an important role during the retained austenite to martensite transformation.
Language eng
DOI 10.1016/j.msea.2016.03.048
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0913 Mechanical Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30085081

Document type: Journal Article
Collection: Institute for Frontier Materials
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Citation counts: TR Web of Science Citation Count  Cited 6 times in TR Web of Science
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Created: Tue, 26 Jul 2016, 08:58:13 EST

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