The microstructural processes were investigated for V-4Cr-4Ti alloys strengthened by precipitation and cold rolling during thermal creep deformation and thermal aging in identical conditions at 1023 K. Cold rolling to precipitate-hardened V-4Cr-4Ti can suppress precipitate coarsening during the following high temperature aging. The dislocations observed were mixture of a〈1 0 0〉 and a/2〈1 1 1〉 types in the specimens with only thermal aging, and predominantly of a/2〈1 1 1〉 type in the specimens after the creep deformation. Coarsening of the precipitates was observed after the creep deformation. It seems to be essential to avoid the recovery of sessile a〈1 0 0〉 type dislocations induced by cold rolling for the purpose of maintaining the high temperature strength.
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