Effect of Manganese content on burring in 0.2%C-TRIP sheet steels with polygonal Ferrite matrix

Akihiko Nagasaka, Takahiro Nakazawa, Tomohiko Hojo, Shunsuke Moriya, Shun Hasebe, Takuya Matsushima, Mitsunari Kitayama, Toshio Murakami, Li Bin Niu, Koh Ichi Sugimoto

研究成果: Article査読

抄録

Effect of manganese content on burring and tapping in 0.2C-1.5Si-(1.0-2.0)Mn (mass%) high strength TRIP-aided sheet steels with polygonal ferrite matrix (TDP steels) was investigated for automotive applications. Burring test was performed on a machining center with rotational speed of 3500 rpm and cutting feed rate of 10 mm/min, using disc specimen of 50 mm in diameter. Moreover, tapping test was performed on a machining center with rotational speed of 20 rpm and cutting feed rate of 20 mm/min after burring. The hardness of flange after burring was evaluated by hardness increment (ΔHV) expressed by ΔHV=HVmax-HV0, where HVmax and HV0 are a maximum hardness after deformation and a base material hardness (an initial Vickers hardness). The hardness increment (ΔHV) increased with increasing of manganese content. The lower the initial carbon concentration in retained austenite (Cγ0), the higher the hardness increment (ΔHV). Strain induced transformation and work hardening contributed to the toughness of flange after burring with TDP steel having a tensile strength of 980 MPa grade.

本文言語English
ページ(範囲)1421-1425
ページ数5
ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
100
11
DOI
出版ステータスPublished - 2014
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学
  • 物理化学および理論化学
  • 金属および合金
  • 材料化学

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