Effect of YAG laser cutting on stretch-flangeability of ultra high strength TRIP sheet steel with bainitic ferrite matrix

Akihiko Nagasaka, Yuichi Kubota, Koh Ichi Sugimoto, Atsushi Mio, Tomohiko Hojo, Koichi Maku, Masahiro Kawajiri, Mitsunari Kitayama

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Effect of YAG laser cutting on stretch-flangeability of 0.2C-1.5Si-1.5Mn (mass%) ultra high-strength TRIP-aided sheet steel with bainitic ferrite matrix (TBF steel) having different martensite start temperatures, which were austempered at 375 or 450°C, was investigated for automotive applications. Hole notches of 5 mm diameter were produced by YAG laser cutting or mechanical punching for hole-expanding test. The stretch-flangeability was evaluated using hole-expanding ratio (X). In TBF steel, laser cutting resulted in much higher stretch-flangeability than mechanical punching. The hole-expanding ratio (X) of TBF steel austempered at 375°C in the case of laser cutting at average powers between 50 and 100 W was higher than that at 450°C, and also higher than mechanical punching. Furthermore, the strength-stretch-flangeability balance (TSX λ) of TBF steel austempered at 375°C showed the highest stretch-flangeability by laser cutting at 100 W. We found that compared with mechanical punching, YAG laser cutting contributed to the improvement of the TSXλ of 1100 MPa class TBF steel with fine bainitic ferrite matrix.

本文言語English
ページ(範囲)351-356
ページ数6
ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
94
9
DOI
出版ステータスPublished - 2008
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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