Grain Size Control reviews significant developments in the
understanding of solid state grain size control over the past half
century to provide an advanced text for materials science students
and practitioners. Fifty years ago, Zener had already formulated
his relationship of the inhibiting influence of fine particles on
grain growth. The derivation of the Zener relationship is presented
here, together with the refinements that have been introduced as a
result of our increased understanding of granular arrays and the
importance of irregularities in such arrays. The important effects
of particle size and volume fraction are illustrated with
applications drawn from the author's experiences with ferrous
materials. The importance of particle solubility and of Ostwald
ripening is emphasised, as any inadequacy in volume fraction and
particle size can lead to abnormal grain growth. Consideration is
also given to the grain growth inhibiting effect of thermally
etched grooves operating in thin strip foils, when free surface
energy effects become more important than grain boundary energy.
Exercises, accompanied by worked examples at the end of the book,
are given at the end of relevant chapters to enable the reader to
calculate particle requirements and how these are attained in
practice.
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