An Investigation on the Softening Mechanism of 5754 Aluminum Alloy during Multistage Hot Deformation

Abstract

Abstract:Isothermal interrupted hot compression tests of 5754 aluminum were conducted on a Gleeble-3500 thermo-mechanical simulator at temperatures of 350 • C and 450 • C, and strain rates of 0.1 s −1 and 1 s −1 . To investigate the metadynamic recrystallization behavior, a range of inter-pass delay times (5-60 s) was employed. These tests simulated flat rolling to investigate how softening behaviors respond to controlled parameters, such as deformation temperature, strain rate, and delay times. These data allowed the parameters for the hot rolling process to be optimized. The dynamic softening at each pass and the effect of metadynamic recrystallization on flow properties and microstructural evolution were analyzed in detail. An offset yield strength of 0.2% was employed to calculate the softening fraction undergoing metadynamic recrystallization. A kinetic model was developed to describe the metadynamic recrystallization behaviors of the hot-deformed 5754 aluminum alloy. Furthermore, the time constant for 50% recrystallization was expressed as functions related to the temperature and the strain rate. The experimental and calculated results were found to be in close agreement, which verified the developed model.

Effect of deformation temperature and degree on tensile properties of the extruded 2024Al/Al18B4O33w composite with extrusion – forging multistage hot deformation

“…There are dislocations in the matrix of the extruded composite, Figure 6c. After the extrusion, holding temperature has the effect on matrix, which can reduce the dislocations and matrix hardening [11, 12]. Thus, with the same average aspect ratio and the alignment of whiskers, ultimate tensile strength of the extruded – heat composite is lower than that of the extruded composite without holding, Figure 3.…”

Development of technologies for hot pressing of rods made from 7075 aluminum alloy on a radial­shear mill of a new design – numerical modeling

“…It should be noted that, using the above data and the method of least squares, the coefficients of the Johnson-Mehl-Avrami-Kolmogorov equation were determined (see below). At the same time, to determine the volume fraction of recrystallized grains, the following Avrami equations were used [31,32]:…”

Modeling and Simulation of the Static Recrystallization of 5754 Aluminium Alloy by Cellular Automaton

“…The heating process used to form materials is of remarkable importance, as it affects the quality of the products [1,2]. However, previous studies have shown that complex metallurgical structural changes that occurred during multi-pass hot rolling and hot compression processes resulted from competing work hardening and softening mechanisms [3,4].…”