The precipitation and high-temperature coarsening behaviour of dispersions of VC, TiC, and (V, Ti)C carbides in ferrite have been examined by electron microscopy. It was found that TiC dispersions initially coarsened most rapidly and (V, Ti)C coarsened least rapidly. The high resistance of (V, Ti)C precipitates to coarsening is considered to be due to the higher chemical-bonding energy of this carbide. A secondary precipitation reaction due to the appearance of long-range-ordered M6C5 occurred at long ageing times for alloys containing either V or both V and Ti.
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