4.4 Article

Effect of Carbon Content on V-Bending in High-Strength TRIP-Aided Dual-Phase Steel Sheets with Polygonal Ferrite Matrix

Journal

ISIJ INTERNATIONAL
Volume 61, Issue 2, Pages 608-616

Publisher

IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.ISIJINT-2020-558

Keywords

V-bending; TRIP steel sheet; chemical composition; springback; bending load; EBSD; residual stress; polygonal ferrite matrix

Funding

  1. 2019 Joint Research Project at the Institute for Materials Research, Tohoku University Foundation [19K0032]
  2. Institute for Materials Research, Tohoku University
  3. National Institute of Technology (KOSEN), Nagano College Foundation

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The study revealed the significant impact of carbon content on V-bending in high-strength TRIP-aided dual-phase steel sheets. Different carbon contents resulted in varying bending capabilities in the tested steel sheets.
Effect of carbon content on V-bending in high-strength TRIP-aided dual-phase (TDP) steel sheets with polygonal ferrite matrix was investigated for automobile applications. V-bending test was performed on a hydraulic testing machine at a processing speed of 1 mm/min, using a rectangular specimen (50 mm in length, 5 mm in width, 1.2 mm in thickness). The main results are as follows. (1) The (0.1-0.4)C-1.5Si-1.5Mn, mass% TDP steel sheets were able to perform V-bending by strain-induced martensitic transformation of TRIP effect. On the other hand, ferrite-martensite dual-phase (MDP0) steel sheet of 900 MPa grade was not able to perform 90-degree V-bending because of initiation of crack in tension region. (2) The 0.4C-1.5Si-1.5Mn, mass% TDP4 steel sheet of 1 100 MPa grade was able to enable the 90-degree V-bending that considered an amount of springback (Delta theta= theta(2) - theta(1)), in which the theta(1) and the theta(2) are a bending angle on loading and a bending angle after unloading respectively, of more than 2-degree by controlling a displacement of punch bottom dead center.

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