Influence of Mo on Growth and Coarsening of Nanometer-sized Carbides in Low-alloy Ferritic Steels Containing Ti

By optical microscopy, transmission electron microscopy and energy dispersive spectroscopy, the changes with aging time in size, composition and distribution of nanometer-sized （Ti, Mo）C precipitated in Ti-Mo low-alloy ferritc steel have been studied in comparison with that of nanometer-sized TiC pr...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2014-09, Vol.21 (9), p.878-885
Main Authors: HU, Bin-hao, CAI, Qing-wu, WU, Hui-bin
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Engineering
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
nanometer-sized carbide
Ostwald coarsening
Physical Chemistry
precipitation strengthening
Processes
Ti-Mo low-alloy ferritic steel
低合金
含钛
生长
硬质合金
粗化
纳米级
透射电子显微镜
铁素体钢
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Summary:By optical microscopy, transmission electron microscopy and energy dispersive spectroscopy, the changes with aging time in size, composition and distribution of nanometer-sized （Ti, Mo）C precipitated in Ti-Mo low-alloy ferritc steel have been studied in comparison with that of nanometer-sized TiC precipitated in Ti low-alloy ferritc steel. It was found that the growth rate of （Ti,Mo）C in Ti-Mo steel was less than that of TiC in Ti steel. Nanometer- sized carbides formed at 650 ~C （or 550 ~C） for 55 h were at transitional stage from growth to coarsening. When aging time reaches 55 h, the coarsening rates of nanometer-sized carbides in Ti and Ti-Mo steel tend to be the same and in- variable. The influence of Mo on growth and coarsening of nanometer-sized carbides tends to decrease with increasing aging time, and Mo contents in nanometer-sized carbides with the same size at different aging time were different.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(14)60156-4