Effect of Surface Microstructures on Corrosion Resistance and Wear Behavior of Salt-Bath Nitrocarburised Low-Carbon Steels

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  • ISHIZUKA Haruna
    Parker Netsusyori Kogyo Co., Ltd. Technical Research Laboratories
  • HIRAI Yuya
    Parker Netsusyori Kogyo Co., Ltd. Technical Research Laboratories
  • AOKI Tomoyuki
    Parker Netsusyori Kogyo Co., Ltd. Technical Research Laboratories
  • WATANABE Youichi
    Parker Netsusyori Kogyo Co., Ltd. Technical Research Laboratories

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Other Title
  • 塩浴軟窒化処理した低炭素鋼の耐食性ならびに摩擦摩耗特性に及ぼす表面組織の影響
  • エンヨクナンチッカ ショリ シタ テイタンソコウ ノ タイショクセイ ナラビニ マサツ マモウ トクセイ ニ オヨボス ヒョウメン ソシキ ノ エイキョウ

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Abstract

We have studied the corrosion resistance and wear behaviour of low-carbon steels by investigating the effect of microstructures formed at the surface by salt-bath nitrocarburising and gas nitriding. The microstructures included a lithium-containing ferroxide layer, a porous layer containing ε-Fe2-3N, and a compound layer composed of ε-Fe2-3N and γ′-Fe4N phases. Corrosion resistances were evaluated by 5%-NaCl aq. splay testing, and corrosion potentials and anode polarization curves were evaluated by electrochemical testing using SPCC steel. Wear behaviours were studied by ball-on-disc sliding tests done under a Hertz’s pressure of 1.73 to 2.05 GPa without lubricant using S15C steel. Results showed that the surface oxide remarkably improved the corrosion resistance, that the porous layer decreased the resistance, and that the ε phase with a high amount of nitrogen had a higher resistance to corrosion compared with the γ′ phase. Furthermore, the oxide had an excellent adhesive resistance at a high contact pressure, the porous layer increased wear resistance because of the relaxation of contact stress during the sliding test, and the γ′ phase with high toughness resulted in better resistance to abrasion wear because the degree of delamination of the γ′ phase by brittle-crack generation was less than that of the ε phase.

Journal

  • NETSUSHORI

    NETSUSHORI 55 (3), 196-204, 2015

    The Japan Society for Heat Treatment

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