Modelling recovery and recrystallisation during annealing of AA 5754 aluminium alloy

Poole, Warren J.; Militzer, Matthias; Wells, Mary A.

doi:10.1179/026708303225005980

Cited by 29 publications

(6 citation statements)

References 13 publications

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“…The interaction time, in fact, has effects on the softening level because it postpones the recovery and recrystallization phenomena. These results are in line with those obtained in continuous heating test replicating heating rates of industrial continuous annealing of cold rolled EN AW 5754 sheet alloy [11]. Finally, it is observed a threshold value of the peak temperature, in which the hardness reaches a minimum value; this hardness value remains constant even for thermal cycles with peak temperatures higher than the threshold temperature, defining an area of maximum softening.…”

Section: Discussionsupporting

confidence: 89%

Laser-induced softening analysis of a hardened aluminum alloy by physical simulation

Palmieri

Lorusso

Tricarico

2020

Int J Adv Manuf Technol

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The study focuses on the analysis of the softening effects of the work-hardened aluminum alloy sheets EN AW 5754 H32 1.5 mm thick, through the physical simulation of thermal cycles induced in the material by laser heat treatments (LHTs). A numerical-experimental approach was implemented to define the laser thermal cycles and to subsequently reproduce them on the GleebleTM 3180 physical simulator. The obtained softening was measured by microhardness and metallographic analysis tests. For the definition of laser thermal cycles, preliminary tests with a 2.5 kW CO2 laser source have been realized, and a three-dimensional transient finite element thermal models were developed and calibrated with the experimental results. The investigated laser heat treatment parameters explored thermal cycles with different shape, interaction time, and peak temperature. Physical simulation tests were performed using laser thermal cycles that showed the maximum softening of the aluminum alloy. A three-dimensional transient finite element thermoelectric model was developed to design the shape of the Gleeble specimens, which satisfy the heating and cooling rate required by laser thermal cycles. Results obtained show that it is possible to physically simulate the investigated laser thermal cycles, reducing the cross section of the shaped part of the specimen. Softening effects depend on the thermal cycle shape. Greater softening is observed by increasing the interaction time and the peak temperature, but beyond a peak temperature threshold value, negligible effects are detected.

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Section: Discussionsupporting

confidence: 89%

Laser-induced softening analysis of a hardened aluminum alloy by physical simulation

Palmieri

Lorusso

Tricarico

2020

Int J Adv Manuf Technol

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“…The dislocation density approaches the density of RT-deformed structures (stress level difference to RT-deformed samples shown by the dashed lines in Fig. 5) and the stress drop curve turns in the direction of logarithmic behaviour [32,55,69].…”

Section: Stage IIImentioning

confidence: 78%

Room Temperature Recovery of Cryogenically Deformed Aluminium Alloys

Gruber

Grabner

Falkinger³

et al. 2020

SSRN Journal

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Increased formability of aluminium alloys has been demonstrated via cryogenic deformation. In previous studies, the microstructures of samples deformed at low temperatures were analysed after reheating to room temperature (RT) and storage. However, after heating the dislocation structure and density of the deformed material do not reflect the cryogenic situation. In this work, we investigate the evolution of flow stress during recovery in Al-Mg and Al-Mg-Si alloys. We examine the RT recovery behaviour of samples pre-strained at 77 K to different strain levels, and evaluate the structural stability upon subsequent deformation. We also study microstructural evolution via in-situ synchrotron X-ray diffraction, starting from initial conditions at cryogenic temperatures to long-term RT-recovery. Recovery of cryogenically deformed samples at RT results in reduction of the flow stress, in dependence on RT storage. The recovery process can be divided into three distinct sections, each based on a different mechanism characterized by either the arranging or the annihilation of dislocations. Subsequent further straining at room temperature after cryogenic forming also generates plastic instabilities and premature fracture due to unfavourable hardening and recovery assisted softening interplay.

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“…Examples of this are found in the literature, such as by Brass, Copper, Titanium, and Molybdenum . These results contrast with the marked drop in the onset of recrystallization temperature measured in Al‐based alloys and high purity tantalum . Early works in very low carbon steel reported a marked softening effect in cold rolled ultra low carbon (ULC) and low carbon steel after heating rates in the fast to ultrafast range.…”

Section: Introductionmentioning

confidence: 96%

The Effect of Heating Rate on the Recrystallization Behavior in Cold Rolled Ultra Low Carbon Steel

Cerda¹,

Vercruysse²,

Minh³

et al. 2016

steel research int.

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Ultrafast heating (UFH) experiments have been carried out in cold rolled ultra low carbon (ULC) steel, followed by quenching. The selected heating rates are in the range between 10 and 800 8C s À1 . The recrystallization curves are slightly shifted to higher temperatures as the heating rate is increased. The average recrystallized grain size and texture are virtually unaffected by increasing the heating rate. Nucleation took place at grain boundaries as well as inside deformed grains. Electron backscattered diffraction (EBSD) analysis reveals that the texture of grains nucleated inside deformed ferrite grains prevails at later stages of recrystallization. The results obtained in this work demonstrate that similar microstructure and textures are obtained after very short annealing cycles.

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Modelling recovery and recrystallisation during annealing of AA 5754 aluminium alloy

Cited by 29 publications

References 13 publications

Laser-induced softening analysis of a hardened aluminum alloy by physical simulation

Laser-induced softening analysis of a hardened aluminum alloy by physical simulation

Room Temperature Recovery of Cryogenically Deformed Aluminium Alloys

The Effect of Heating Rate on the Recrystallization Behavior in Cold Rolled Ultra Low Carbon Steel

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