Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 517, Issue 1-2, Pages 1-7Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.03.021
Keywords
Nanostructured steel; Bimodal microstructure; Ductility; TRIP effect
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A nanostructured/ultrafine steel with a complex microstructure comprising bainitic ferrite, austenite and martensite was obtained by mechanical alloying and spark plasma sintering of powders. Transmission electron microscopy and X-ray diffraction analysis were employed to investigate the microstructural morphologies and the nature of bainitic ferrite and retained austenite formed during sintering process. The presence of a complex microstructure with elongated ferritic lamellae separated by thin layers of retained austenite was revealed. Some ferritic equiaxed grains are also present. The steel displays a large uniform plastic deformation, thanks to its work hardenability provided by the microstructural characteristics: the bimodal distribution of ferrite, the multiphase microstructure and the TRIP phenomenon provided by austenite. (C) 2009 Elsevier B.V. All rights reserved.
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