Nanostructured/ultrafine multiphase steel with enhanced ductility obtained by mechanical alloying and spark plasma sintering of powders

被引：27
|
作者：
Menapace, C. [1 ]
Lonardelli, I. [1 ]
Tait, M. [1 ]
Molinari, A. [1 ]
机构：
[1] Univ Trent, Dept Mat Engn & Ind Technol, I-38050 Trento, Italy
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 517卷 / 1-2期
关键词：
Nanostructured steel; Bimodal microstructure; Ductility; TRIP effect; STRENGTH BAINITIC STEELS; FINE-GRAINED STEELS; RETAINED AUSTENITE; STRAIN; MICROSTRUCTURE; TRANSFORMATION; TEXTURE; DESIGN; FE;
D O I：
10.1016/j.msea.2009.03.021
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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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页码：1 / 7
页数：7
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