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

1 引用 (Scopus)

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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.

元の言語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
発行部数9
DOI
出版物ステータスPublished - 2008 12 1
外部発表Yes

ASJC Scopus subject areas

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

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