A Demonstration of Local Heat Treatment for the Preform Annealing Process

Lee, Theresa; Hartfield-Wünsch, Susan E.

doi:10.4271/2011-01-0538

Cited by 8 publications

(7 citation statements)

References 4 publications

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“…This resulted in formation of twin bands (shown by white arrows in Fig. 4(c)) because of good strain compatibility between twins and the c-axis of grains [6]. As noted by Humphreys and Hatherly [13], limited twinning shear can lead to more energetically favorable shear bands to accommodate the larger strains (see Fig.…”

Section: Load (N)mentioning

confidence: 91%

“…In order to improve room temperature formability, grain reorientation and refinement have been proposed [4,5] and many processing methods such as equal channel angular extrusion (ECAE) have been developed. Since these methods are difficult to implement on a large scale sheet forming application, the feasibility of multi-step forming has been investigated, particularly for low ductility materials which could not be formed in a single continuous operation [6]. Also, the possibility of small radius bending of Mg alloys at room temperature is itself not paid enough attention in literature.…”

Section: Introductionmentioning

confidence: 99%

“…Bending mandrel load versus displacement traces, bending angle (θ) and bendability (r min /t) for samples with number of bending steps(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17).…”

mentioning

confidence: 99%

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Large deformation of magnesium sheet at room temperature by preform annealing, part II: “Bending”

Habibnejad-korayem

Jain

Mishra

2014

Materials Science and Engineering: A

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Section: Load (N)mentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Large deformation of magnesium sheet at room temperature by preform annealing, part II: “Bending”

Habibnejad-korayem

Jain

Mishra

2014

Materials Science and Engineering: A

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“…1) However, aluminum alloy sheets have lower formability than conventional steel sheets, resulting in the difficulty of forming complex-shaped panels and bodies via the traditional cold stamping. In order to address this formability challenge in large batch production, various heat treatment methods have been integrated into the stamping process, resulting in the creation of heat-treatmentstamping integrated techniques, including intermediate annealing-stamping integrated method, 2) warm stamping, 3) stamping in the W temper 4) and hot stamping. 5) The latter one applies plastic deformation to the aluminum alloy sheet at the solution heat treatment temperature, and then quenches the formed part in cool dies.…”

Section: Introductionmentioning

confidence: 99%

Combined Effect of Pre-Strain at Elevated Temperature and Pre-Aging on Aging Strength and Microstructures of AA6082

Chen

Shan

2020

Mater. Trans.

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With the increasingly serious energy and environmental issues, aluminum alloys are becoming increasingly desirable for transportation facilities due to their high specific strength. Their low formability results in the difficulty of forming complex-shaped panels and bodies. Hot stamping is a new technology developed to address this formability challenge by applying plastic deformation to the heated aluminum alloy sheet at the solution heat treatment temperature. The stamped panels gain high strength via the sequent aging treatment. Different panels, even different regions on the same panel, are subjected to different forming strains. The present paper is focused on the experimentally investigating the effects of the pre-strain at elevated temperature and pre-aging on the mechanical behavior and microstructures of AA6082 after the natural aging, paint-bake treatment, and artificial aging. Sample sheets of AA6082-T6 were pre-strained by uniaxial tension at different levels of strain, and then subjected to the pre-aging, natural aging, paint-bake treatment or artificial aging, respectively. The yield strength, tensile strength and elongation of post-aged samples were gained via the standard uniaxial tensile tests. The results show that both of the pre-strain at elevated temperature and pre-aging suppress the natural aging of AA6082. Pre-strain at elevated temperature induces weak bake softening, and has a detrimental effect on the artificial aging strengthening, while the sequent pre-aging could compensate the strength decrease.

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“…Preform annealing is one of the more recent approaches which has shown promise not only to form complex shapes but also to meet associated requirements such as cycle time and cost [6]. Preform annealing involves an initial room temperature stamping process followed by annealing heat treatment and then a final room temperature stamping process [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Annealing response of AA5182 deformed in plane strain and equibiaxial strain paths

Mishra

Tatiparti

Tiwari

et al. 2013

Philosophical Magazine

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The annealing response of AA5182 Al-Mg alloy deformed to an effective prestrain of e = 0.15 via plane strain and equibiaxial strain paths is compared. The comparison is done at two temperatures namely, 623 and 673 K. The recovery, recrystallization and grain growth behaviour of this alloy is studied by electron backscatter diffraction and dislocation density estimation using Xray line broadening analysis. It is found that recrystallization is slower in equibiaxial deformation condition compared to that in plane strain deformation condition during annealing. Significant recrystallization is observed after annealing for 60 s at 673 K and for 480 s at 623 K following plane strain deformation. Furthermore, significant recrystallization is associated with lower grain growth at 673 K ($55 μm) as opposed to that at 623 K ($75 μm). The results are explained on the basis of differences in both the strain paths.

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A Demonstration of Local Heat Treatment for the Preform Annealing Process

Cited by 8 publications

References 4 publications

Large deformation of magnesium sheet at room temperature by preform annealing, part II: “Bending”

Large deformation of magnesium sheet at room temperature by preform annealing, part II: “Bending”

Combined Effect of Pre-Strain at Elevated Temperature and Pre-Aging on Aging Strength and Microstructures of AA6082

Annealing response of AA5182 deformed in plane strain and equibiaxial strain paths

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