Atomic scale observations of bainite transformation in a high carbon high silicon steel
Atomic scale observations of bainite transformation in a high carbon high silicon steel
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DOI：
10.1016/j.actamat.2006.08.033
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发表时间：
2007-01-01
期刊：
影响因子：
9.4
通讯作者：
Garcia-Mateo, C.
中科院分区：
文献类型：
--
作者：
Caballero, F. G.;Miller, M. K.;Garcia-Mateo, C.
通过200 ℃奥氏体转变获得了高强度、高韧性的细尺寸贝氏体组织。X射线衍射分析表明，这些贝氏体铁素体板的碳浓度高于预期的准平衡。原子探针断层扫描显示，大量的碳被困在附近的铁素体-奥氏体界面的位错。这些结果表明，碳捕获在位错阻止脱碳的过饱和贝氏体铁素体，从而改变了在低温贝氏体形成过程中的碳化物沉淀顺序。(c)2006 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
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.