On dynamic recrystallisation

B. Derby, M. F. Ashby

Research output: Contribution to journalArticlepeer-review

Abstract

When dynamic recrystalllsatlon occurs during constant straln-rate tests, the stress
within the sample tends to a steadyj or "saturation" value. This steady-state stress is
associated with a new, and constant mean grain size within the material. These effects are
caused by cycles of nucleatlon and recrystallisation which occur out-of-phase at numerous
sites within the material, so that the mean properties tend to constant values. The
saturation stress is determined by the steady distribution of hardness (dlslocatlon density)
within the material; the mean grain size by a balance between the speed of recrystallisation
(i.e. grain boundary migration rate) and the rate of nucleation of new recrystallisation
events. The steady state reflects a dynamic balance between nucleation and growth, and
between hardening and resoftening; thus a study of the steady state can lead to a better
understandlng of the complete recrystallisation process.
Original languageEnglish
Pages (from-to)879-884
Number of pages6
JournalScripta metallurgica
Volume21
Issue number6
DOIs
Publication statusPublished - 1 Jan 1987

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