HFQ forming of AA6082 tailor welded blanks

Liu, Jun; Gao, Haoxiang; Fakir, Omer El; Wang, Liliang; Lin, Jianguo

doi:10.1051/matecconf/20152105006

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…Accordingly, by using this technique, due to the high-temperature forming, a better formability and extremely low springback were obtained compared to that formed at room temperature [8][9][10][11]. In addition, the integrated cooling during the forming operation enables high cooling rates and the creation of a supersaturated solid solution (SSSS) after solutionizing, which is needed to generate precipitate nucleation during aging treatment in the case of precipitation-hardenable aluminum alloys [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Hot Deformation on the Precipitation Hardening of High-Strength Aluminum AA7075 during Thermo-Mechanical Processing

Scharifi

Shoshmina

Biegler

et al. 2021

Metals

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The aim of this work was to investigate the effect of hot deformation on the aging behavior of precipitation-hardenable aluminum alloy AA7075 within a novel thermo-mechanical forming process, in order to gain insight into its precipitation kinetics. For this purpose, the material was formed at 420 °C after undergoing solution treatment to different strain levels ranging from 2% to 10% to obtain different dislocation densities. After undergoing hot deformation, aging at 120 °C with different parameters was carried out to improve the material hardness. The resulting material properties and microstructure evolution were characterized afterward using hardness measurements and a transmission electron microscope (TEM). TEM investigations revealed the formation of very fine particles for the material formed at 2%, as well as at 10%, of formed material, which act as effective barriers to dislocation motion. It was found that the response of artificial aging on the deformation degree in hot forming was less than expected due to the thermally activated mechanisms, leading to a decrease in dislocation density. Therefore, a dramatic increase in material hardness with the increase in hot deformation was not observed.

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Section: Introductionmentioning

confidence: 99%

Influence of Hot Deformation on the Precipitation Hardening of High-Strength Aluminum AA7075 during Thermo-Mechanical Processing

Scharifi

Shoshmina

Biegler

et al. 2021

Metals

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“…For example in conventional hot stamping using a furnace, the heating time of forming tools is approximately 2 h [9]. Research into forming technologies with increased productivity has developed processes such as the solution heat treatment, forming and in-die quenching [10], the quick-plastic forming [11], and the hot stamping using rapid heating [9,12]. One promising solution to overcome these difficulties proposed in the literature is using the hot stamping process to form complex-shaped components from sheet metal with cold dies, and rapidly quenching the workpiece in the dies simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Formability and microstructure evolution mechanisms of Ti6Al4V alloy during a novel hot stamping process

Kopeć

Wang

Politis

et al. 2018

Materials Science and Engineering: A

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A novel hot stamping process for Ti6Al4V alloy using cold forming tools and a hot blank was presented in this paper. The formability of the material was studied through uniaxial tensile tests at temperatures ranging from 600 to 900 °C and strain rates ranging from 0.1 to 5 s-1. An elongation ranging from 30% to 60% could be achieved at temperatures ranging from 750 to 900°C respectively. The main microstructure evolution mechanisms varied with the deformation temperature, including recovery, phase transformation and recrystallization. The hardness of the material after deformation first decreased with the temperature due to recovery, and subsequently increased mainly due to the phase transformation. During the hot stamping tests, qualified parts could be formed successfully at heating temperatures ranging from 750 to 850°C. The forming failed at lower temperatures due to the limited ductility of the material. At temperatures higher than 900°C, extensive phase transformation of α to β occurred during the heating. During the transfer and forming, the temperature dropped significantly which led to the formation of transformed β, reduction of the formability and subsequent failure. The post-form hardness distribution demonstrated the same tendency as that after uniaxial tensile tests.

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“…The weld area in aluminium TWBs is typically weaker than the base material, which adds difficulty in forming such TWBs. A novel process, solution Heat treatment, Forming and in-die Quenching (HFQ®) has demonstrated its advantages in the forming of AA6082 TWBs with improved formability, as it could eliminate the welding effects and restore the mechanical properties of the welding zone [3].…”

Section: Introductionmentioning

confidence: 99%

Studies on the Hot Forming and Cold-Die Quenching of AA6082 Tailor Welded Blanks

Liu

Wang

Gao

et al. 2016

KEM

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An advanced forming process involving hot forming and cold-die quenching, also known as HFQ®, has been employed to form AA6082 tailor welded blanks (TWBs). The HFQ® process combines both forming and heat treatment in a single operation, whereby upon heating the TWB, it is stamped and held between cold tools to quench the component to room temperature. The material therefore undergoes temperature, strain rate or strain path changes during the operation. In this paper, a finite element model (FEM) was developed to investigate the formability and deformation characteristics of the TWBs under HFQ® conditions. Experimental results, i.e. strain distribution, were used to compare and validate the simulation results. A good agreement between the experiment and simulation has been achieved. The developed temperature, strain rate and strain path dependent forming limit prediction model has been implemented into FE simulation to capture the complicated failure features of the HFQ® formed TWBs. It is found from both experiment and simulation that the forming speed has important effects on the occurrence of failure position, where the failure mode for the 1.5-2 mm TWBs may change from localised circumferential necking to parallel weld necking.HFQ® is a registered trademark of Impression Technologies Ltd.

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HFQ forming of AA6082 tailor welded blanks

Cited by 4 publications

References 4 publications

Influence of Hot Deformation on the Precipitation Hardening of High-Strength Aluminum AA7075 during Thermo-Mechanical Processing

Influence of Hot Deformation on the Precipitation Hardening of High-Strength Aluminum AA7075 during Thermo-Mechanical Processing

Formability and microstructure evolution mechanisms of Ti6Al4V alloy during a novel hot stamping process

Studies on the Hot Forming and Cold-Die Quenching of AA6082 Tailor Welded Blanks

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