Flow Stress Analysis using the Kocks-Mecking Model for Ferrite-Cementite Steels with Various Ferrite Grain Sizes

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概要

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• True stress (σ)–true strain (ε) curves were calculated by using the Kocks–Mecking (KM) model for the ferrite–cementite steels with various ferrite grain sizes between 0.47 and 13.6 μm. In the KM model, the effect of ferrite grain size on flow stress is described by the athermal stress component that follows the Hall–Petch equation. The effects of temperature and strain rate on flow stress, which are correlated with the thermal stress component, are independent of the ferrite grain size. The calculated σ–ε curves by using the KM model agree with the measured ones at various temperatures and strain rates including the high-speed tensile test with a strain rate of 103 s−1. From the calculations based on a micromechanic model, it is found that the volume fraction of second phase affects the grain size dependence in multi-phase steels. The m-value showing strain rate sensitivity for the external stress was decreased with a decrease in grain size and that for the thermal stress was independent of grain size.

• 社団法人 日本鉄鋼協会の論文
• 2008-07-15

著者

• Tomota Yo

  Graduate School of Science and Engineering/Frontier Research Center on Atomic Science, Ibaraki Unive

• Nagai K

  National Inst. For Materials Sci. Tsukuba Jpn

• Nagai K

  Univ. Hyogo

• Nagai Kotobu

  Exploratory Materials Research Laboratory For Reliability And Safety National Institute For Material

• Nagai K

  Steel Research Center National Institute For Materials Science

• Nagai Kotobu

  Steel Research Center National Institute For Materials Science

• NAGAI Kotobu

  Materials Engineering Laboratory, National Institute for Materials Science

• Tomota Y

  Ibaraki University Faculty Of Engineering

• Nagai K

  Materials Research For The Environment And Energy National Institute For Materials Science

• Nagai K

  Metallurgical Processing Group Steel Research Center National Institute For Materials Science

• TSUCHIDA Noriyuki

  School of Engineering, University of Hyogo

• FUKAURA Kenzo

  School of Engineering, University of Hyogo

• Fukaura Kenzo

  School Of Engineering University Of Hyogo

• Tsuchida Noriyuki

  School Of Engineering University Of Hyogo

• Tomota Yo

  Graduate School Of Sci. And Engineering/frontier Res. Center On Atomic Sci. Ibaraki Univ.

• Nagai K

  Exploratory Materials Research Laboratory For Reliability And Safety National Institute For Material

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