TRIP型複合組織鋼の深絞り性に及ぼす炭素添加量の影響

概要

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Effect of retained austenite on the deep drawing in high strength TRIP-aided dual-phase (TDP) sheet steels with different carbon content were investigated. The deep drawability based on the limiting drawing ratio (LDR=D_0/d_p), where the D_0 and the d_p are a maximum blank diameter and a punch diameter respectively, was affected by the volume fraction of the retained austenite and by its stability (carbon concentration). Namely, the higher the volume fraction of the retained austenite and its stability, the larger strength-deep drawability balance, i.e., the product of tensile strength and LDR. Furthermore, the higher blank folding force, the larger the strength-deep drawability balance of high carbon TDP steel. The excellent deep drawability was due to large local necking resistance at the cup wall just above the punch bottom due to "the transformation hardening" and "the stress relaxation" resulting from the strain-induced martensite transformation, as well as a low drawing resistance of the shrinking flange.
社団法人日本鉄鋼協会の論文