4.4 Article

V-Bendability of Ultrahigh-Strength Low Alloy TRIP-Aided Steel Sheets with Bainitic Ferrite Matrix

期刊

ISIJ INTERNATIONAL
卷 62, 期 1, 页码 247-256

出版社

IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.ISIJINT-2021-092

关键词

V-bending; TRIP steel sheet; springback; bending load; EBSD; residual stress; bainitic ferrite matrix

资金

  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

向作者/读者索取更多资源

The effect of retained austenite characteristics on V-bending in ultrahigh-strength TRIP-aided steel sheets with bainitic ferrite matrix (TBF steel) for automotive applications was investigated. It was found that the 0.2C-1.5Si-1.5Mn TBF steel sheets performed V-bending through strain-induced martensitic transformation of TRIP effect, while the ferrite-martensite dual-phase (MDP0) steel sheet of 900 MPa grade was not able to perform 90-degree V-bending due to crack initiation in tension area. Additionally, the TBF375 steel sheet, produced by specific heat treatment, enabled 90-degree V-bending and controlled the amount of springback.
Effect of retained austenite characteristics on V-bending in ultrahigh-strength TRIP-aided steel sheets with bainitic ferrite matrix (TBF steel) was investigated for automotive applications. V-bending tests were performed on a servohydraulic testing machine at a processing speed of 1 mm/min using a 88-degree V-punch (2.0 mm in punch radius), 88-degree V-die (12 mm in die gap, 0.8 mm in die shoulder radius), and a rectangular specimen (50 mm in length, 5 mm in width, 1.2 mm in thickness). The results are summarized as follows. (1) The 0.2C-1.5Si-1.5Mn (mass%) TBF 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 area. (2) The TBF375 steel sheet that produced by heat treatment of annealing at 1 173 K (900 degrees C) for 1 200 s followed by austempering at 648 K (375 degrees C) for 200 s, of 1 100 MPa grade was able to enable the 90-degree V-bending that considered an amount of springback (Delta theta = theta(1) - theta(2)), in which the theta(1) and the theta(2) were 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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