Effect of carbon content on v-bending in high-strength TRIP-aided dual-phase steel sheets with polygonal ferrite matrix

Akihiko Nagasaka, Tomohiko Hojo, Masaya Fujita, Takumi Ohashi, Mako Miyasaka, Yuki Shibayama, Eiji Akiyama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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 1100 MPa grade was able to enable the 90-degree V-bending that considered an amount of springback (Δθ=θ21), in which the θ1and the θ2are 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.

Original languageEnglish
Pages (from-to)934-943
Number of pages10
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume106
Issue number12
DOIs
Publication statusPublished - 2020

Keywords

  • Bending load
  • Chemical composition
  • EBSD
  • Polygonal ferrite matrix
  • Residual stress
  • Springback
  • TRIP steel sheet
  • V-bending

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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