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The stresses induced by carbon diffusion in a cylindrical structure

机译：碳在圆柱结构中扩散引起的应力

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摘要

In the petrochemical industry,carburization corrosion often occurs in carbonaceous environment which leads to the performance deterioration and reduces the service life of metal materials.The stress induced by carbon diffusion is one of the main causes of failure for components.In the present paper,the diffusion process of constant surface concentration of carbon from inner wall to outer surface was studied based on the Fick's law.The diffusion-induced stress formulas in a cylindrical structure were derived using solid mechanics theory.The distribution of radial stress,circumferential stress and axial stress was simulated by self-developed program,respectively.The results show that the carbon concentration increases with an increase in carburization time.The radial stress is always compressive and increases with time.With the development of carburization the circumferential stress is compressive near inner surface and tensile near outer surface.The circumferential stress at the inner surface has the maximum value and decreases with time extended.However the circumferential stress near outer surface increases with time.The distribution of axial stress is analogous to circumferential stress.The analysis also shows that the ratio of outer radius to inner radius of cylindrical structure has an effect on the distribution of carbon concentration and stresses.At last,the results are applied to the process of carburization of ethylene cracking furnace tubes of HP40-Nb.
机译：在石油化学工业中，碳质环境中经常发生渗碳腐蚀，这会导致性能下降并降低金属材料的使用寿命。碳扩散引起的应力是部件失效的主要原因之一。根据菲克定律，研究了碳从内壁到外表面的恒定表面浓度的扩散过程，利用固体力学理论推导了圆柱结构中的扩散诱导应力公式。径向应力，周向应力和轴向应力的分布结果表明，碳浓度随着渗碳时间的增加而增加。径向应力始终是压缩的，并且随着时间的推移而增加。随着渗碳的发展，周向应力在内表面附近逐渐压缩。外表面附近的拉力。内表面的圆周应力表面具有最大值并随时间延长而减小。但是，外表面附近的圆周应力随时间增加。轴向应力的分布类似于圆周应力。分析还表明，圆柱结构的外半径与内半径之比为最后，将结果应用于HP40-Nb乙烯裂解炉管的渗碳工艺中。

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  • 来源
    《国际断裂力学2009年会》|2009年|575-580|共6页
  • 会议地点 Chengdu(CN);Chengdu(CN)
  • 作者

    Xiaoyan Qin; Jianming Gong; Luyang Geng; Liming Shen;

  • 作者单位

    College of Mechanical and Power Engineering,Nanjing University of Technology,Nanjing 210009,China;

    College of Mechanical and Power Engineering,Nanjing University of Technology,Nanjing 210009,China;

    College of Mechanical and Power Engineering,Nanjing University of Technology,Nanjing 210009,China;

    College of Mechanical and Power Engineering,Nanjing University of Technology,Nanjing 210009,China;

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

    Cylindrical structure; Carburization; Diffusion-induced stresses;

    机译：圆柱结构;渗碳;扩散引起的应力;

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