Dynamic and post-dynamic recrystallization under hot, cold and severe plastic deformation conditions

Application of modern aluminum alloys to aircraft

A critical review of experimental results and constitutive descriptions for metals and alloys in hot working

An internal variable constitutive model for hot working of metals

The background physical metallurgy and the data available on recrystallization and grain growth after hot deformation of low-carbon manganese steel are briefly reviewed. The derived structural relationships are then used in a computing procedure which enables the evolution of microstructure during rolling to be predicted as a function of the temperatures, pass reductions, speeds, and times in rolling schedules. Plate rolling is considered as a specific example and it is shown that uncertainties in the basic data do not seriously affect the predictions whereas modifying the rolling schedules leads to major differences in the asrolled microstructures. In particular, there are critical regions in the rolling schedule when recrystallization times are of the order of the interpass times. Where comparisons can be made, the predictions are in agreement with practical observations.

Recrystallization and grain growth in hot rolling

The main feature of hot working is that extremely large strains are applied to materials at high rates of strain at temperatures above ∼ 0.6Tm, where Tm is the melting temperature in degrees Kelvin. Strength and ductility under these conditions are markedly dependent on both temperature and rate of straining. Although this review is confined to strength and structure during hot working, ductility is intimately related to the deformation processes that govern plastic flow. This aspect has been recently reviewed by one of the authors. These large strains can be achieved with little or no strain-hardening, indicating that dynamic softening processes can operate sufficiently rapidly to balance the strain-hardening processes. In this situation, the structural changes involved can be used to obtain information on the mechanism of deformation. However, as emphasised later, care must he taken in the interpretation of such hot-worked structures, since significant structural changes can occur on holding at ...

W. J. McG. Tegart

Papers

Strength and structure under hot-working conditions