炭素クラスターの強化機構に関する原子論的研究

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タイトル別名
  • A Mechanism of Carbon-Cluster Strengthening though Atomic Simulations
  • タンソ クラスター ノ キョウカ キコウ ニ カンスル ゲンシロンテキ ケンキュウ

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<p>To investigate the reason why low-carbon steels with carbon-clusters shows the maximum strength during low-temperature aging, interactions between an edge dislocation and carbon clusters are performed through molecular dynamics (MD) simulations. Carbon clusters are modeled based on atom probe tomography (APT) observations. To express a transition process of carbon configurations from solid solution state to carbon cluster state to precipitation state during aging process, we reduce a carbon presence area with a fixed number of carbon atoms, i.e., the carbon concentration can be continuously increased. The MD simulations can represent the age hardening/softening tendency observed in the experiment and the carbon cluster state shows the maximum strength where the dislocation passes through the carbon cluster not by the Orowan but by the cutting mechanism. The MD analysis found that partial clusters in the carbon cluster act as the main resistance to dislocation passage; the biased distribution of carbon atoms is also confirmed in the actual observed carbon clusters by APT. A new interaction mechanism between dislocation and carbon clusters is developed based on the phenomena in the MD simulations and the availability is discussed.</p>

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 84 (1), 19-27, 2020-01-01

    公益社団法人 日本金属学会

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