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<p>This work introduces a novel laboratory-scale electric-assisted hot forming in-die quenching (EHFQ) setup, where solution heat treatment (at 470 ± 5&#xa0;°C, soaking for 10&#xa0;min) of AA7075-T6 sheets was done through the alternating current (AC) injection. Blank was placed inside the die setup during heating, and deformed at three specific punch speeds after applying blank holding force. EHFQ done at 10, 25, and 36&#xa0;mm/min speeds produced 58%, 69% and 93% increase in limiting dome heights (LDHs), respectively, when compared to room temperature (RT) forming. A smoother thickness and strain distribution pattern for EHFQ at 36&#xa0;mm/min indicated improved formability compared to lower speeds. The necking-based and fracture-based failure strains in EHFQ were approximately 55% higher than those obtained at RT. The post-formed hardness (VHN) was approximately 32% lower than that of the AA7075-T6. An increased dispersion density of dimples in SEM images at fracture also substantiated the enhanced ductile fracture, resulting in higher formability during high-speed deformation.</p>

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Effect of Punch Speed on Formability of 7075-T6 Sheets in Novel Electric Hot Forming In-Die Quenching (EHFQ) Process

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Rushil Ratnakar Rao,
  • Ajin Elias Alex,
  • Amal S. Siju,
  • Sudhy S. Panicker

摘要

This work introduces a novel laboratory-scale electric-assisted hot forming in-die quenching (EHFQ) setup, where solution heat treatment (at 470 ± 5 °C, soaking for 10 min) of AA7075-T6 sheets was done through the alternating current (AC) injection. Blank was placed inside the die setup during heating, and deformed at three specific punch speeds after applying blank holding force. EHFQ done at 10, 25, and 36 mm/min speeds produced 58%, 69% and 93% increase in limiting dome heights (LDHs), respectively, when compared to room temperature (RT) forming. A smoother thickness and strain distribution pattern for EHFQ at 36 mm/min indicated improved formability compared to lower speeds. The necking-based and fracture-based failure strains in EHFQ were approximately 55% higher than those obtained at RT. The post-formed hardness (VHN) was approximately 32% lower than that of the AA7075-T6. An increased dispersion density of dimples in SEM images at fracture also substantiated the enhanced ductile fracture, resulting in higher formability during high-speed deformation.