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This article is dedicated to hot deformation metallurgy. After mentioning several notions on thermodynamic treatment, this article successively deals with low or moderate deformations and then high deformations as well as the resulting evolutions, notably the continuous and discontinuous dynamic recrystallizations. This study requires the definition of various parameters including the potentials for deformation speed and constraints as well as the presentation of the laws governing the empirical and physical behavior. Finally, the article presents the basic elements in order to elaborate a model of dynamic recrystallization illustrated by examples of results specific to the two types of recrystallization.
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Frank MONTHEILLET: Research Director, CNRS - École nationale supérieure des mines de Saint-Étienne - Materials and Structures Science Center - CNRS Plasticity, Damage and Corrosion of Materials Unit
INTRODUCTION
Shaping metallurgy is the subject of two articles in the same treatise, dealing respectively with the problems of cold and hot plastic deformation, excluding processes involving material removal (machining) and various types of assembly (welding, bonding, etc.). On the other hand, tribological issues (friction and lubrication, wear) or thermal issues (self-heating, metal-tool heat transfer), of considerable importance in the analysis of most processes, are the subject of separate articles in the "Metallic Materials" database:
This dossier is devoted to hot plastic forming. For general information on forming metallurgy and cold forming, see
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Hot forming metallurgy
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