Abstract
The present study addresses recrystallization process in Al-Mg-Mn-Zn-Zr system alloy samples. The samples are collected from cast ingot, produced by casting to industrial DC mold, and homogenized based on standard industrial practice. After that the samples were rolled with different hot rolling schedules. Rolled samples were annealed at different temperatures and their resultant microstructure was examined using optical microscope. During the study new grains nuclei generation rate and their growth rate were determined, analytical records, describing recrystallization kinetics, were obtained, main differences, specific to this alloy recrystallization in 350 ºС-450 ºС temperature range, were identified.
Highlights
Multiple studies address recrystallization process [1-9], processes, occurring during cold worked metal annealing [3], as well as processes occurring during hot deformation of preliminary worked over structure [1013] are well studied and described in detail, only few studies deal with recrystallization during early stages of hot deformation [1,14,15]
The causes stem from the following features specific to hot rolling initial passes: low strain level, low strain rate, high temperature (400-500 oС) and cast structure, characterized by large interdendritic distance
It is difficult to predict the structure during hot rolling with high deformation centre, as the following multiple factors shall be accounted for: workpiece heating during plastic deformation and cooling down due to roll contact, strain level and rate heterogeneity, with
Summary
Multiple studies address recrystallization process [1-9], processes, occurring during cold worked metal annealing [3], as well as processes occurring during hot deformation of preliminary worked over structure [1013] are well studied and described in detail, only few studies deal with recrystallization during early stages of hot deformation [1,14,15] They use diverging data, producing invalid results, if applied in calculations of hot rolling initial passes. There is a trend to slab thickness increase, deformation non-uniformity will build up during multi-pass rolling, initial 5÷10 passes may involve full ingot surface recrystallization and completely intact as-cast structure in the ingot midsection In this case the produced workpiece will be characterized by high mechanical properties anisotropy, it will demonstrate high scrap potential, eg., laminations and cracks, this is true for hard alloys. This study addresses recrystallization kinetics in 1565ch samples, having initial as-cast structure, and processed with the above range of temperature-rate parameters
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