A Mechanism of Carbon-Cluster Strengthening though Atomic Simulations

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  • Shimokawa Tomotsugu
    Faculty of Mechanical Engineering, Institute of Science and Engineering, Kanazawa University
  • Yasui Kiichiro
    Division of Mechanical Science and Engineering, Graduate School of Natural Science and Technology, Kanazawa University
  • Niiyama Tomoaki
    Faculty of Mechanical Engineering, Institute of Science and Engineering, Kanazawa University
  • Kinoshita Keisuke
    Advanced Technology Research Laboratories, Nippon Steel Corporation
  • Sawada Hideaki
    Advanced Technology Research Laboratories, Nippon Steel Corporation

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  • 炭素クラスターの強化機構に関する原子論的研究
  • 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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Abstract

<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>

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