Effects of Warm Forming on Deep Drawability of a TRIP-aided Dual-phase sheet Steel (2nd report, Swift cup test)
抄録
To improve the deep drawing of a high-strength TRIP-aided dual-phase (TDP) sheet steel, the effects of warm forming on the deep drawability in Swift flat-bottom cup test was investigated about 0.19C-1.54Si-1.52Mn (mass%) TDP steel. The steel exhibited a larger limiting drawing ratio (LDR) than those of the conventional ferrite-bainite and ferrite-martensite dual-phase sheet steels without retained austenite. The LDR was enhanced by warm drawing at about 150℃, at which the strain-induced transformation of the retained austenite particles is suppressed the most. This was caused by large local necking resistance due to the transformation hardening and stress relaxation resulting from the strain-induced transformation at the cup wall just above the radius of the punch, as well as a lower drawing resistance of the shrinking flange.
TRIP型複合組織鋼板の深絞り性に及ぼす温間加工の明響 : 第2報:スウィフトカップ試験
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