Improvement in Ductility of High Purity Chromium at Room Temperature by Combining Thermomechanical and Pre-strain Treatments

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  • Kanamori Takashi
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya University
  • Maruta Toshitsugu
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya University
  • Matsumoto Yoshihisa
    Department of Mechanical Engineering, Oita National College of Technology
  • Harada Yasunori
    Department of Production Systems Engineering, Toyohashi University of Technology
  • Murata Yoshinori
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya University
  • Morinaga Masahiko
    Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya University

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  • 高純度クロムの加工熱処理と予ひずみ付与による常温延性の改善
  • コウジュンド クロム ノ カコウ ネツ ショリ ト ヨヒズミ フヨ ニ ヨル ジョウオン エンセイ ノ カイゼン

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Abstract

Experiments were performed with high purity chromium to make a search for some method for improving the ductility at room temperature. The ductile-to-brittle transition temperature (DBTT) was about 555 K for as-sintered specimens. However, it was lowered by about 200 K using proper thermomechanical treatment. For example, the rolling at 973 K to reduce the specimen thickness by 15% per pass, and the subsequent annealing at 1273-1373 K were repeated until the total reduction of specimen thickness reached 85%, followed by the final annealing at 1473 K. When such thermomechanically treated specimens were then pre-strained by 2-5%, polycrystalline chromium exhibited a fracture elongation exceeding 20% even at room temperature.

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