Abstract
A comparative analysis of formability was investigated between Fe-Mn-C twinning induced plasticity steel with different Mn contents and interstitial-free steel. Tensile test combing with the morphology of fracture reveals that element Mn is helpful for the forming of inclusion or panicles with film or rod shapes inducing the crack initiation and propagation. During stamping process, twinning induced plasticity steel without earing shows better anisotropy than interstitial-free steel because a typical <111> fiber texture forms accompanied by a weaker <100> fiber texture. The difference between the two steels is not evident during Erichsen cone cupping test, but the result of cone cupping test indicates that the twinning induced plasticity steel has superior drawing ability compared with interstitial-free steel. The different performances can be attributed to the different deformation mechanism during cupping test. FLD (forming limit diagram) of tested steels further suggests twinning induced plasticity steel has slightly superior deep drawability but low stretchability than that of IF steel, whose FLD0 value can reach 30%.
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Huang, Y., Zhao, Am., Mi, Zl. et al. Formability of Fe-Mn-C Twinning Induced Plasticity Steel. J. Iron Steel Res. Int. 20, 111–117 (2013). https://doi.org/10.1016/S1006-706X(13)60205-8
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DOI: https://doi.org/10.1016/S1006-706X(13)60205-8