Numerical Simulation to the Effect of Soluble Nitrogen on High-Temperature Strength of Ferritic Heat-Resistant Steels

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  • Hara Ken-ichiro
    Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Yokohama National University
  • Endo Takao
    Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Yokohama National University

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  • フェライト系耐熱鋼の高温強度に及ぼす固溶窒素の影響に関する数値シミュレーション
  • フェライトケイ タイネツ コウ ノ コウオン キョウド ニ オヨボス コヨウ チッソ ノ エイキョウ ニ カンスル スウチ シミュレーション

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Abstract

Based on a solute atoms diffusion model, contribution from soluble nitrogen to the high-temperature strength was numerically examined for ferritic heat-resisting Fe-Cr-N and Fe-Mo-N alloys. The solute distribution around a moving dislocation was determined by simulating the jump process of interstitial and substitutional solute atoms under an elastic interaction between a dislocation and solute atoms. The Central Atoms Model was employed to evaluate the formation probability of interstitial and substitutional atom pairs (I-S pair) in a complex atmosphere consisting of interstitial and substitutional atoms. The steady-state dragging stress was calculated as a function of dislocation velocity. Calculations show that the existence of only a low concentration of I-S pairs (a few hundred ppm) suffice to give considerable improvement in high-temperature strength.

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