@article{oai:nagano-nct.repo.nii.ac.jp:00000168,
 author = {NAGASAKA, Akihiko and KUBOTA, Yuichi and KAWAZIRI, Hiromasa and MIO, Atsushi and HOJO, Tomohiko and MAKII, Koichi and 長坂, 明彦 and 窪田, 優一 and 川尻, 將洋 and 三尾, 敦 and 北條, 智彦 and 槙井, 浩一},
 journal = {長野工業高等専門学校紀要, Memoirs of Nagano National College of Technology},
 month = {Jun},
 note = {application/pdf, In the present work, effect of YAG laser cutting pulse energy on stretch-flangeability in 0.2C-1.5Si-1.5Mn ultra high-strength TRIP-aided sheet steel with bainitic ferrite matrix (TBF steel) which were austempered at 375 or 450℃ was investigated for automotive applications. The tensile strength (TS) of TBF steel austempered at 375℃ was higher than that of TBF steel austempered at 450℃. The press formability of laser cut surface layer was investigated by hole-expanding test. On the other hand, the stretch-flangeability (λ) of TBF steel in the case of hole-punching austempered at 375℃ was larger than that of TBF steel austempered at 450℃. Further, the stretch-flangeability austempered at 375℃ in the case of laser cutting at 4J/P was larger that that of 450℃. The strength-stretch-flangeability balance (TS×λ) of TBF steel austempered at 375℃ became maximum by laser cutting at 4J/P. The good stretch-flangeability was completed by laser cutting at 4J/P in TBF steel austempered at 375℃. The stretch-flangeability of laser cut hole depended on surface roughness in TBF steel austempered at 375℃. When a suitable condition of laser cutting is selected, the stretch-flangeability of laser cut hole is better than that of punched hole.},
 pages = {1--5},
 title = {TRIP型ベイニティックフェライト鋼板の伸びフランジ性に及ぼすYAGレーザ切断パルスエネルギーの影響},
 volume = {41},
 year = {2007}
}