Springback-free Isothermal Forming of High-strength Steel Sheets and Aluminum Alloy Sheets under Warm and Hot Forming Conditions

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著者

    • YANAGIMOTO Jun
    • Environmental Conscious Ultra-Fine-Grained Steel Consortium of JRCM (The Japan Research and Development Center of Metals)

抄録

Quasi-isothermal sheet forming experiments of 300 mm square–1 mm thickness sheets are conducted using newly developed forming dies with a built-in heater and a 3000 kN hydraulic press, and the characteristics of springback reduction due to the elevation in forming temperature are clarified. The springback-free forming of high-strength steel sheets is realized in the warm forming temperature range. This result is confirmed by isothermal V-bending tests in a hot compression testing machine, where a marked decrease in springback is observed when the forming temperature of mild, precipitation-hardened, TRIP and dual-phase steels is higher than 750 K, which is approximately the critical temperature for the onset of ferrite recrystallization.

収録刊行物

  • ISIJ international

    ISIJ international 46(9), 1324-1328, 2006-09-15

    The Iron and Steel Institute of Japan

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