Dynamic deformation behavior of ultrafine-grained iron produced by ultrahigh strain deformation and annealing

作者：Okitsu Yoshitaka^*; Takata Naoki; Tsuji Nobuhiro

来源：Scripta Materialia, 2011, 64(9): 896-899.

DOI：10.1016/j.scriptamat.2011.01.026

• Ultrafine-grained microstructure
• Interstitial free (IF) steels
• Accumulative roll bonding (ARB)
• Yield phenomenon
• Strain rate

The dynamic tensile deformation behavior of ultrafine-grained interstitial free steel is shown in this paper. As the strain rate increased, the yield drop phenomenon became more significant in the stress strain curves. The difference in flow stress between the dynamic and quasi-static strain rates did not decrease with grain refinement, in contrast to conventional high-strength steels. It is suggested that the grain refinement affected mainly the athermal component of the flow stress.

• 出版日期2011-5