TRIP型複合組織鋼板の深絞り性に及ぼすしわ押え力の影響

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  • TRIPガタ フクゴウ ソシキ ゴウバン ノ フカシボリセイ ニ オヨボス シワ オサエリョク ノ エイキョウ
  • Effects of Blank Holding Force on Deep Drawability of TRIP-aided Dual-phase Sheet Steels

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Effects 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) was affected by volume fraction of the retained austenite and its stability. Namely, the higher the volume fraction of the retained austenite and its stability, the larger the strength-deep drawability balance, i.e., the product of tensile strength and LDR. Furthermore, the higher the blank holding force (BHF), the larger the strength-deepdrawability balance of high carbon TDP steel. The excellent deep drawability was caused by 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 punch force of the shrinking flange.

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