Effects of Second Phase Morphology on Warm Stretch-Flangeability in a TRIP-Aided Dual-Phase Steel Sheet
抄録
The effects of retained austenite parameters (stability and volume fraction) and second morphology ("a network structure:TYPE I" and "an isolated fine and acicular one:TYPEIII") on a warm hole-punching and warm hole-expanding of a high-strength TRIP-aided dual-phase (TDP) steel sheet were investigated. Good warm stretch-flangeability, i.e., large hole-expanding ratio and low hole-expanding load and large hole-expanding height, was achieved particularly in the steel with the second phase morphology of TYPE III, in which the retained austenite islands were nearly isolated in the ferrite matrix away from bainite islands. The hole-expanding ratio increased up to that of the ferrite-bainite dual-phase steel.
TRIP型複合組織鋼板の温間伸びフランジ性に及ぼす第2相形態の影響
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