Thermodynamics of nitrogen absorption into solid solution in Fe-Cr-Mn ternary alloys

T. Tsuchiyama, S. Takaki

    研究成果: ジャーナルへの寄稿会議記事査読

    1 被引用数 (Scopus)


    For the purpose of fabricating ultra-high nitrogen austenitic steels (>1mass%N), the phenomenon of nitrogen absorption into solid solution was thermodynamically analyzed and applied to Fe-Cr-Mn system ternary alloy. During the annealing of the steel in a nitrogen gas atmosphere of 0.1 MPa at 1473 K (nitrogen absorption treatment), the nitrogen content of the steel was increased with the absorption of nitrogen gas from the material surface and then saturated when the system reached a state of equilibrium. The effect of the steel composition on the equilibrium nitrogen content was formulated taking account of interactions among Cr, Mn and N atoms, and the condition for fabrication of ultra-high nitrogen austenitic steels was clarified. The nitrogen addition to ultra-high content markedly increased proof stress and tensile stress of the austenitic steels without losing moderate ductility. For example, Fe-24Cr-10Mn-1.43N (mass%) alloy has 830 MPa in 0.2% proof stress, 2.2 GPa in true tensile stress and 75% in total elongation.

    ジャーナルMaterials Science Forum
    出版ステータス出版済み - 1月 1 2003
    イベントThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, スペイン
    継続期間: 7月 7 20037月 11 2003

    !!!All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学


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