Evaluating Solubility and Diffusion Coefficient of Hydrogen in Martensitic Steel Using Computational Mechanics

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  • FUKUDA Kazuhito
    Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University
  • TOJO Akihiro
    Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University
  • MATSUMOTO Ryosuke
    Nagamori Institute of Actuators, Kyoto University of Advanced Science

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  • マルテンサイト鋼における水素固溶度と拡散係数の計算力学的評価
  • マルテンサイトコウ ニ オケル スイソコヨウド ト カクサン ケイスウ ノ ケイサン リキガクテキ ヒョウカ

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Abstract

<p>Engineering applications of high-strength martensitic steels have been limited because of concerns regarding delayed fracture. Recent experimental and theoretical studies revealed that the presence of mobile hydrogen moving toward cleavage crack surfaces in these steels plays an important role in delayed fracture. Although the accumulation rate of hydrogen is affected by its own concentration and diffusion coefficient, it is still unclear how these properties are influenced by varying carbon content in martensitic steel. In this study, we estimated the hydrogen accumulation rate in martensitic steel under different carbon contents (0.395 and 0.787 mass %) and temperatures (300, 700, and 1000 K) by calculating its hydrogen solubility and diffusion coefficient using computational methods such as the density functional theory, molecular dynamics simulation, and finite element method. Results revealed that the hydrogen accumulation rate tended to increase with the carbon content and vice versa.</p>

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