Effect of Heat Treatment Atmosphere on Carbon Flux in Ultra-Rapid Carburizing

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  • YAMAMOTO Ryosuke
    Graduate School of Science and Engineering, Kansai University KOYO THERMO SYSTEMS CO., LTD.
  • NISHIMOTO Akio
    Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University
  • TODA Kazutoshi
    KOYO THERMO SYSTEMS CO., LTD.

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Other Title
  • 超高速浸炭処理の炭素侵入特性における熱処理雰囲気の影響
  • チョウコウソク シンタン ショリ ノ タンソ シンニュウ トクセイ ニ オケル ネツ ショリ フンイキ ノ エイキョウ

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<p>To reduce the processing time for in-line carburizing, we performed ultra-rapid carburizing and quenching using induction heating. Conventional gas carburizing and vacuum carburizing（low-pressure carburizing）are treated at 1203～1323 K, which is lower than the eutectic temperature. In contrast, in this study, the carburizing temperature of 1523 K was higher than the eutectic temperature for speeding up this process. The SCM420 sample was rapidly heated to the treatment temperature by induction heating. CH4 and N2 were mixed and treated at atmospheric pressure at 5 vol％ CH4 and 10 vol％ CH4. For ultra-rapid carburizing, the total carburizing depth was proportional to the square root of the carburizing time, following the parabolic law, regardless of the CH4 concentration. We obtained that the amount of carbon penetrating the steel from the atmosphere was proportional to the carburizing time. In other words, the carbon penetration rate was approximately constant during the carburizing process. The processing time for the ultra-rapid carburizing and quenching at 1523 K in this study was only 5％ of that for the conventional gas carburizing at 1203 K.</p>

Journal

  • NETSUSHORI

    NETSUSHORI 61 (4), 183-190, 2021

    The Japan Society for Heat Treatment

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