The stresses induced by carbon diffusion in a cylindrical structure
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 Ficks 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.
Cylindrical structure Carburization Diffusion-induced stresses
Xiaoyan Qin Jianming Gong Luyang Geng Liming Shen
College of Mechanical and Power Engineering,Nanjing University of Technology,Nanjing 210009,China
国际会议
成都
英文
575-580
2009-10-16（万方平台首次上网日期，不代表论文的发表时间）