Effect of Precipitation Behavior of AlN on Abnormal Growth of Ferrite Grains in Low-carbon Steel Wires

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  • OCHIAI Ikuo
    Kimitsu Technical Research Laboratories, Nippon Steel Corp.
  • OHBA Hiroshi
    Kimitsu Technical Research Laboratories, Nippon Steel Corp.
  • HIDA Yooji
    Kimitsu Technical Research Laboratories, Nippon Steel Corp.
  • NAGUMO Michihiko
    Kimitsu Technical Research Laboratories, Nippon Steel Corp.

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  • 低炭素鋼線の焼鈍における異常粒成長におよぼす AlN の析出状態の影響
  • テイ タンソ コウセン ノ ヤキナマシ ニ オケル イジョウリュウ セイチョウ

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Abstract

Abnormal growth of ferrite grains in low-carbon steel wires (C<0.04%) was studied from the viewpoint of AlN precipitation during annealing after cold drawing of 70.2% in reduction.<BR>(1) Abnormal grain growth occurred when Al/N ratio of steel wires decreased to the range from 1 to 6.<BR>(2) AlN precipitation in wire rod within above range of Al/N ratio was delayed in the course of cooling after the hot rolling, followed with fine AlN precipitations during recrystallization and grain growth at annealing stage after drawing. Such precipitates generated a large restraining force on the grain boundary movement and grain growth was completely depressed. In the case of the isothermal annealing at 800°C, however, abnormal grain growth occurred in accordance with decrease in the restraining force as a result of the coalescence of AlN precipitates immediately after the precipitation had been completed.<BR>(3) The critical conditions investigated for the abnormal grain growth initiating in the restrained grains were in good agreement with HILLERT'S theoretical expectations.<BR>(4) The restraining force of the fine precipitates on the grain boundary movement can be evaluated as follows :<BR>s=f;(1-log f;2)σ/3r<BR>where s is the restraining force ; r and ƒ are radius and volume fraction of the second phase particles, respectively ; σ is the grain boundary energy.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 70 (15), 2001-2008, 1984

    The Iron and Steel Institute of Japan

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