Preparation of High Nitrogen Containing Stainless Steels by Mechanical Alloying Method and Their Localized Corrosion Behavior

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  • FUKUTSUKA Tomokazu
    Dept. of Materials Sci. and Chemistry, Graduate School of Eng., Univ. of Hyogo
  • ANZAI Tetsuya
    Dept. of Applied Chemistry, Faculty of Eng., Himeji Inst. of Tech.
  • KANEDA Mami
    Dept. of Materials Sci. and Chemistry, Graduate School of Eng., Himeji Inst. of Tech.
  • MATSUO Yoshiaki
    Dept. of Materials Sci. and Chemistry, Graduate School of Eng., Univ. of Hyogo
  • SUGIE Yosohiro
    Dept. of Materials Sci. and Chemistry, Graduate School of Eng., Univ. of Hyogo
  • FUKAURA Kenzo
    Dept. of Materials Sci. and Chemistry, Graduate School of Eng., Univ. of Hyogo

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Other Title
  • メカニカルアローイング法による高窒素添加ステンレス鋼の作製と局部腐食特性評価
  • メカニカルアローイングホウ ニ ヨル コウチッソ テンカ ステンレス コウ ノ サクセイ ト キョクブ フショク トクセイ ヒョウカ

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Abstract

High nitrogen containing stainless steel was prepared by mechanical alloying (MA) method from SUS 447 powder. The SUS 447 powder was ball-milled at N2 atmosphere and then HIP treatment was carried out. The obtained stainless steels were examined by X-ray diffraction (XRD) and scanning electron microscope (SEM). With the increase in the time of MA treatment, dissolved nitrogen content of the stainless steel was increased, and ferrite phase changed into austenite phase. The evaluation of corrosion behavior was carried out by the electrochemical corrosion test. For the stainless steel with MA treatment without nitrogen, it was found that the pitting potential in sulfuric acid solution including the chloride was very noble. And clear pitting corrosion was not observed for the stainless steel with MA treatment with nitrogen. The results of electrochemical corrosion test indicated that localized corrosion was suppressed by the MA treatment.

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