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Effect of Plasma Nitriding on the Wear and Corrosion Properties of Hastelloy CW2M Alloy

机译：等离子体渗氮对哈氏合金CW2M合金耐磨性和腐蚀性能的影响

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摘要

Hastelloy C alloys are widely used in chemical and nuclear industries in corrosive environments. The predominant alloying elements of these nickel-based alloys are typically chromium and molybdenum, although other elements are added. Plasma nitriding is an efficient surface treatment to increase wear resistance. The objective of this work was to evaluate the influence of nitriding treatment on the wear and corrosion properties of the Hastelloy CW2M super-alloy. Hastelloy CW2M was plasma nitrided using the dc method with the following conditions: a gas mixture of 80 vol. % H_2 and 20 vol. % N_2, a pressure of 500 Pa, temperature of 450 and 500 ℃ during 5 h. As-cast and plasma treated samples were analyzed using scanning electron microscopy, wear and corrosion tests. An EDS line scan performed on the samples cross- section indicates that Cr and Mo content are the largest on the layer, with decreasing amounts of Ni and with stable amounts of Fe. Plasma nitriding of Hastelloy CW2M produced a homogeneous layer with high hardness. X-ray diffraction revealed a ? (fcc) phase for the un-nitrided CW2M. The nitriding performed at 450 ℃ yielded chromium and molybdenum nitride peaks and an expanded phase. At 500 ℃, an increase on the chromium and molybdenum nitride peaks was observed. The wear of samples nitrided at 450 and 500 ℃ were almost 10 times lower than the substrate's wear, which indicates a great improvement on the tribological properties. The corrosion parameters showed that although the corrosion potential goes toward positive potentials, by increasing nitriding temperature, the corrosion current moves in the opposite direction. Nitriding at 450 ℃ promoted good corrosion protection with more positive open circuit and corrosion potentials.
机译：哈氏合金C合金广泛用于腐蚀性环境中的化学和核工业。这些镍基合金的主要合金元素通常是铬和钼，尽管添加了其他元素。等离子体氮化是提高耐磨性的有效表面处理。这项工作的目的是评估氮化处理对Hastelloy CW2M超级合金的磨损和腐蚀性能的影响。在以下条件下，使用dc方法对Hastelloy CW2M进行了等离子氮化： ％H_2和20 vol。 N 2％，压力为500 Pa，温度为450和500℃，持续5 h。使用扫描电子显微镜，磨损和腐蚀测试分析铸态和等离子体处理过的样品。对样品横截面进行的EDS线扫描表明，随着Ni含量的减少和Fe含量的稳定，Cr和Mo含量最高。哈氏合金CW2M的等离子渗氮产生了具有高硬度的均匀层。 X射线衍射显示出α。 （fcc）相为未氮化的CW2M。在450℃进行的氮化处理产生了铬和氮化钼峰和一个膨胀相。在500℃时，铬和氮化钼的峰增加。在450和500℃氮化的样品的磨损几乎是基体磨损的10倍，这表明摩擦性能有了很大的提高。腐蚀参数表明，尽管腐蚀电位趋于正电位，但通过增加氮化温度，腐蚀电流沿相反方向移动。在450℃进行氮化可促进良好的腐蚀防护，并具有更多的正向开路和腐蚀电位。

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  • 来源
    《》|2010年|303-312|共10页
  • 会议地点 Rio de Janeiro(BR)
  • 作者

    Luiz Carlos Casteletti; Frederico Augusto Vires Fernandes; Stenio Cristaldo Heck; Carlos Alberto Picon; George Edward Totten;

  • 作者单位

    Dept. of Materials, Aeronautical and Automotive Engineering, Sao Carlos School ofEngineering, Univ. of Sao Paulo, Av. Trabalhador Saocarlense, n. 400, 13566-590, SaoCarlos, SP, Brazil;

    Dept. of Materials, Aeronautical and Automotive Engineering, Sao Carlos School ofEngineering, Univ. of Sao Paulo, Av. Trabalhador Saocarlense, n. 400, 13566-590, SaoCarlos, SP, Brazil;

    Dept. of Materials, Aeronautical and Automotive Engineering, Sao Carlos School ofEngineering, Univ. of Sao Paulo, Av. Trabalhador Saocarlense, n. 400, 13566-590, SaoCarlos, SP, Brazil;

    Dept. of Physics and Chemistry, Engineering School of Ilha Solteira, Av. Brasil, n. 56,15385-000, Ilha Solteira, SP, Brazil;

    Dept. of Mechanical and Materials Engineering, Portland State Univ., Post Office Box751, 97207-0751, Portland, OR 97207-0751;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hastelloy C, plasma nitriding, wear, corrosion;

    机译：哈氏合金C，等离子渗氮，磨损，腐蚀;

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