期刊
MATERIALS CHARACTERIZATION
卷 102, 期 -, 页码 146-155出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2015.03.005
关键词
Microalloyed steel; Cooling rate; TEM; Carbide precipitation
类别
资金
- National High Technology Research and Development Program of China (863 Program) [2012AA03A508]
- Center for Structural and Functional Materials Research and Innovation
- Department of Metallurgical and Materials Engineering, University of Texas at El Paso, USA
In this study we elucidate carbide precipitation at varied cooling rates in Ti-Nb-Mo microalloyed steels during continuous cooling. The study suggests that increasing the cooling rate prevents precipitate formation in the ferrite phase during continuous cooling after finish rolling at 850 degrees C. At a lower cooling rate of 0.5 degrees C/s, the microhardness of ferrite grains exhibited maxima because of high volume fraction of fine carbides. A high density of nanoscale carbides with similar precipitation characteristics, including interphase precipitates, was observed at cooling rates of 0.5 and 1 degrees C/s, but the carbides were marginally larger and the spacing between them was increased with cooling rate. Additionally, carbide precipitation at a high cooling rate was associated with strain-induced precipitation. Through the analysis of selection area electron diffraction patterns and high-resolution transmission electron microscopy, lattice imaging, the fine spherical-shaped carbides of size similar to 6-10 nm were identified as MC-type carbides of the type (Ti,Nb,Mo)C and NbC. (C) 2015 Elsevier Inc. All rights reserved.
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