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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.Nanometersized carbides formed at 650℃(or 550℃)for 55 hwere 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 invariable.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.
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. Nanometersized carbides formed at 650 ° C or 550 ° C) for 55 hwere 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 invariable. influence on 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.