Hot Stamping of a B-Pillar Outer from High Strength Aluminum Sheet AA7075

Harrison, Nia R.; Luckey, S. George

doi:10.4271/2014-01-0981

Cited by 103 publications

(48 citation statements)

References 10 publications

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“…For this type of alloy, precipitation hardening is the main strengthening mechanism, whereas the hot workability becomes lower to enhance the strength of the alloy, as was shown in Al-Mg-Si and Al-Zn-Mg alloys [6], and in Al 7150 [7]. In order to overcome the low formability in the alloy, a limited study has suggested the application of a hot-stamping technique for aluminum alloys [8].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Jung

Lee

Kawasaki

2018

Metals

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Abstract:The present study investigates the significance of pre-strain on the T6 aging behavior of an Al 7075 alloy for evaluating the applicability of hot stamping. In practice, the alloy was pre-strained up to 15% during solution heat treatment at 480 • C prior to quenching, and artificial aging was conducted at 120 • C. The peak aging time and precipitation behavior were compared with the alloy with pre-straining at room temperature after quenching but immediately before the artificial aging. The results showed that increasing amounts of pre-strain tend to reduce the aging time up to 50% for achieving peak hardness, which is consistent with the alloy at the T6 condition. There is a limitation for the maximum attainable amount of pre-strain of 10% for the homogeneous distribution of strain when the alloy is strained at room temperature (RT) due to the low formability. The pre-strained alloy as hot stamping exhibited lowering of the peak reaction temperatures for dissolution and formation of Guinier-Preston (GP)-Zones and precipitated with increasing amounts of pre-strain towards 15% through the differential scanning calorimetry analysis, thereby confirming the shortening of the peak aging time. The present study confirms the excellent potential of the hot-stamping process to extend the capability of an Al 7075 alloy.

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Section: Introductionmentioning

confidence: 99%

“…Specifically, processing by hot stamping provides high strength by inducing the martensitic transformation of the steel by quenching within the die [9][10][11]. For an Al 7075 alloy, the hot-stamped parts are rapidly quenched to obtain W-temper, and then requires artificial aging cycles of T6 or T7 in order to achieve high strength [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Jung

Lee

Kawasaki

2018

Metals

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“…To form deep draw shapes and complex geometries, forming processes, such as superplastic forming, warm forming [39], hot forming [40,41,42], and hydro-forming processes [43,44,45,46,47], are needed to form automotive parts. Due to higher silicon content in the aluminum alloys, the abrasive nature of the material make dies wear out faster using aluminum sheets than with mild steel.…”

Section: Aluminummentioning

confidence: 99%

Simulation and Optimization of an Aluminum-Intensive Body-on-Frame Vehicle for Improved Fuel Economy and Enhanced Crashworthiness - Front Impacts

Tyan

Sun

et al. 2015

SAE Int. J. Mater. Manf.

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“…Many aluminum alloys, such as AA6082, AA7075, AA6061, have demonstrated their feasibility in hot stamping process [1][2][3]. Some researchers and companies even utilized this process manufactured aluminum parts in complex shapes without any failures, indicating that this process has a bright future [4,5]. However, as aluminum hot stamping process was conducted at elevated temperatures, more obvious complexity can be observed during experiments compared with cold stamping [6].…”

Section: Introductionmentioning

confidence: 99%

Behaviors and modeling of thermal forming limits of AA7075 aluminum sheet

Xiao

Wang

2020

Archiv.Civ.Mech.Eng

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The aluminum hot stamping process has been widely studied to produce lightweight parts in automobile industry. As forming limit of aluminum sheet at elevated temperatures plays a vital role in judging stamping formability, this study aims at experimentally investigating the forming limits and establishing a constitutive model to predict them. In this study, isothermal deformation test (Nakajima test) of AA7075 was conducted to determine its forming limits at temperatures of 300-450 °C and stamping speeds of 13-40 mm/s. Based on the experimental results, a constitutive model considering continuum damage mechanics was established to predict the forming limits under different deformation conditions. It was found that the formability of the material is best at 400 °C, and a higher strain rate can improve formability slightly. The comparisons between model predictions and experimental results were evaluated; results indicated a good prediction accuracy of the model in describing forming limits of AA7075 at elevated temperatures. Moreover, comparison between different studies on the thermal forming limits of AA7075 was discussed in detail.

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Hot Stamping of a B-Pillar Outer from High Strength Aluminum Sheet AA7075

Cited by 103 publications

References 10 publications

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Simulation and Optimization of an Aluminum-Intensive Body-on-Frame Vehicle for Improved Fuel Economy and Enhanced Crashworthiness - Front Impacts

Behaviors and modeling of thermal forming limits of AA7075 aluminum sheet

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