W-Temper forming of B-pillar from 7075 aluminum alloy

Gronostajski, Z.; Jaśkiewicz, K.; Kaczyński, Paweł; Skwarski, Mateusz; Polak, S.; Krawczyk, J.; Chorzępa, Władysław; Trzpis, Przemysław

doi:10.1016/j.cirp.2022.03.019

Cited by 9 publications

(3 citation statements)

References 13 publications

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“…Aluminium alloys have become very popular in the automotive industry owing to their good specific strength and corrosion resistance. However, the formability of many aluminium alloys at room temperature is low [1,2]. Warm and hot forming methods are applied in metal forming processes because they improve the formability of materials such as aluminium or magnesium alloys [3].…”

Section: Introductionmentioning

confidence: 99%

Electrically-assisted deep drawing of 5754 aluminium alloy sheet

Dobras

2023

Materials Research Proceedings

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Abstract. The effect of current pulse application on the mechanical behaviour and plasticity of the 5754 aluminium alloy was studied. Tensile and deep drawing tests were conducted. The 5754 aluminium alloy in two different states of hardening was used: H111 and H22. The results show that the application of current pulses can significantly increase the plasticity of the examined alloys in the case of the tensile test. The dynamic recovery process is the main process responsible for the increase in plasticity of the material. However, in the case of the deep drawing process, it was observed that the increase in the material formability is low, and further studies are needed.

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Section: Introductionmentioning

confidence: 99%

Electrically-assisted deep drawing of 5754 aluminium alloy sheet

Dobras

2023

Materials Research Proceedings

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“…Extruded 7050 and 7075 aluminum parts in A-pillar or B-pillar are typical applications in new-generation autos [8][9][10]. Though the sheet product application for 7xxx alloy in auto is limited due to the difficulties in room temperature formability compared with that of 5xxx or 6xxx sheets, it is still worth to further studying the sheets for 7xxx alloy if the hot forming technology is gradually accepted by the manufacturers [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of hot deformation on microstructure evolution, hardness, and intergranular corrosion of 7085 aluminum alloy sheets

Wu¹,

Kai²,

Guan³

et al. 2023

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In this work, slabs of 7085 aluminum alloy were fabricated by electromagnetic stirring and solidifying with copper mold and suffered hot plastic deformation. The straight hot rolling process was used when the slabs were preheated to 420 • C for 1 h. The thicknesses of 1-, 2-, and 3-mm sheets correspond to the thickness reduction rate of 92, 83, and 75 % of original rectangular slabs. The microstructure results show that hot rolling deformation crushes the remanent phases into small sizes, leads particles into homogeneous distribution, and changes the dendritic grain into a fiber structure. The recrystallization rate decreases with the final sheet thickness increase after heat treatment. The recrystallization is strictly restricted when the thickness reduction rate approaches 92 %. EBSD results provide a unique perspective to view grain and dislocation evolution and texture change in different tempers of sheets. The hardness and intergranular corrosion (IGC) performance show that hardness is reduced while the corrosion depth is aggravated by the rise of sheet thickness. The maximum hardness is 86.75 HRB, and the minimum corrosion depth is only 9.17 µm in the 1-mm sheet. The effects of grain boundary precipitates (GBPs), recrystallization, and precipitate-free zone (PFZ) on hardness and IGC were studied.

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“…Several studies have investigated the relationship between various W-temper process parameters, such as temperature, cooling rate, and holding time, and their effect on springback. Gronostajski et al [8] determined the best W-Temper condition for forming the B-pillar from 7075 aluminium alloy using both mathematical modelling and experiments. The research focused on the most important problems that arise during the cold forming of solution heat-treated sheets: the selection of optimal temperature and cooling parameters, thinning of the post-formed element, followed by the ageing and springback process.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the effect of W-temper forming process parameters on springback

Jemal

Zsolt

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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High strength aluminium alloys have drawn a lot of attention because of the expanding demand for lightweight vehicle design in the automotive sector. Due to poor formability at room temperature warm and hot forming have been advised. However, warm and hot forming methods need more steps in the production process and an advanced tooling system. In contrast, since ordinary tools can be used, forming sheets at room temperature in the W-temper condition is advantageous. However, a significant problem that must be resolved during the use of this technique is the springback of supersaturated sheets and their thinning. In this study, the high strength aluminium alloy was solution heat treated, and a U-shaped bending test was carried out at different time periods between W-temper heat treatment and forming operation. As a result, it is noted that the springback is highly dependent on the time between W-temper heat treatment and forming operations, and the change in shape increases with increasing time. The change in shape after forming was also evaluated using numerical simulation aiming to validate the experimental result. To determine the material parameters of the kinematic hardening model for numerical simulation, uniaxial tension-unload tests were performed under different ageing conditions.

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W-Temper forming of B-pillar from 7075 aluminum alloy

Cited by 9 publications

References 13 publications

Electrically-assisted deep drawing of 5754 aluminium alloy sheet

Electrically-assisted deep drawing of 5754 aluminium alloy sheet

Effects of hot deformation on microstructure evolution, hardness, and intergranular corrosion of 7085 aluminum alloy sheets

Experimental investigation of the effect of W-temper forming process parameters on springback

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