0.2C-Si-Mn高強度TRIP型複合組織鋼板のプレス成形性に及ぼす第2相形態の影響

概要

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The effects of second phase morphology on press-formability in 0.2C-(1.0-2.5)Si-(1.0-2.0)Mn (mass%) high strength TRIP-aided dual-phase (TDP) sheet steels were investigated. Good stretch-flangeability in terms of hole-punching and the successive hole-expanding was achieved in a TDP steel with an isolated fine and acicular second phase. In the acicular type of TDP steel, volume fraction and carbon concentration (stability) of retained austenite increased considerably over a conventional type of TDP steel with a network second phase along ferrite grain boundary. The acicular type of TDP steel also had the best balance of stretch-formability and stretch-flangeability of conventional high strength steels, such as a ferrite-bainite steel which have an excellent stretch-flangeability.
長野工業高等専門学校の論文
1997-00-00