期刊
ACTA MATERIALIA
卷 55, 期 1, 页码 381-390出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2006.08.033
关键词
bainitic steel; phase transformation; atom-probe field-ion microscopy
A fine-scale bainitic microstructure with high strength and high toughness has been achieved by transforming austenite at 200 degrees C. X-ray diffraction analysis showed the carbon concentration of these bainitic ferrite plates to be higher than expected from para-equilibrium. Atom-probe tomography revealed that a substantial quantity of carbon was trapped at dislocations in the vicinity of the ferrite-austenite interface. These results suggest that the carbon trapping at dislocations prevents the decarburization of super-saturated bainitic ferrite and therefore alters the carbide precipitation sequence during low-temperature bainite formation. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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