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KSME international journal v.16 no.8, 2002년, pp.1109 - 1116   피인용횟수: 2

Characteristics of Fatigue Crack Initiation and Fatigue Strength of Nitrided 1 Cr- 1Mo-0.25V Turbine Rotor Steels

Suh, Chang-Min   (Department of Mechanical Engineering, Kyungpook National UniversityUU0000096  ); Hwang, Byung-Won   (Department of Mechanical Engineering, Kyungpook National UniversityUU0000096  ); Murakami, Ri-Ichi   (Department of Mechanical Engineering, Tokushima UniversityUU0015008  );
  • 초록

    To investigate the effect of nitriding layer on both fatigue crack initiation and fatigue life, turbine rotor steel ( IC.- 1Mo-0.25V steel) specimens were nitrided by the nitemper method and then put to a rotary bending fatigue test at room and elevated temperatures. In nitriding, temperature and time were controlled to obtain a different nitrided thickness. Microstructure analysis, micro-Victors hardness test, and scanning electron microscope observation were carried out for evaluating experiments. In results, the fatigue cracks of nitrided specimens were initiated at inclusion near the interface between nitrided layer and substrate, which showed fish-eye type appearance in fractograph. The fatigue life of nitrided specimens at every temperature was prolonged compared to that of the non-nitrided. However, there was not observable improvement in fatigue characteristics with the increase of a nitrided thickness.


  • 주제어

    Nitriding .   Fish-Eye Crack .   Fatigue Strength .   Fatigue Crack Initiation.  

  • 참고문헌 (15)

    1. Suh, C. M. and Kitagawa, H., 1987, 'Crack Growth Behavior of Fatigue Microcracks in Low Carbon Steels,' Fatigue Fracture Engineering Materials Structure, Vol. 9, No. 6, pp. 409-424 
    2. Suh, C. M., Kim, K. R. and Lee, D. W., 1999, 'Fatigue Strength of TiAIN Ceramic Coated lCr-lMo-0.25V Steel at Elevated Temperatures,' International Journal of Ocean Engineering and Technology, Vol. 1, No. 1, pp. 69-76 
    3. Yamamoto, K., et al., 1975, 'The Comparison of Properties in Iron-nitrided and un-nitrided Specimen,' Japanese Metallic Material, Vol. 15, No. 7, pp. 26-37 
    4. Murakami, Y., 1989, 'Effect of Small Defects and Nonmetallic Inclusions on the Fatigue Strength of Metals,' JSME International Journal, Vol. 32, No. 2, pp. 167-180 
    5. Murakami, Y. and Usuki, H., 1989, 'Prediction of Fatigue Strength of High-Strength Steels Based on Statistical Evaluation of Inclusion Size,' Journal of JSME, A55, No. 510, pp. 213-221 
    6. Murakami, Y., Kodama, S. and Konuma, S., 1989, 'Quantitative Evaluation of Effects of Non-metallic Inclusions on Fatigue Strength of High Strength Steel. I: Basic Fatigue Mechanism and Evaluation of Correlation between the Fatigue Fracture Stress and the Size and Location of Non-metallic Inclusions,' International Journal of Fatigue, Vol. 11, No. 5, pp. 291-298 
    7. Qian, J. and Fatemi, A., 1995, 'Cyclic Deformation and Fatigue Behavior of Ion-Nitrided Steel,' International Journal of Fatigue, Vol. 17, No. 1, pp. 15-24 
    8. Kwak, B. M. and Gil, Y. J., 1985, 'An Indirect Experimental Method for the Determination of Mechanical Properties of Ion-nitrided Layer and Residual Stress Distribution,' Transaction of the Korean Society of Mechanical Engineers, Vol. 9, No. 2, pp. 240-249 
    9. Lankford, J., 1997, 'Initiation and Early Growth of Fatigue Cracks in High Strength Steel,' Engineering Fracture Mechanics, Vol. 9, pp. 617-624 
    10. Magnusson, L., 1973, 'Low Cycle Behavior of Case Hardened Steel,' Mechanisms of Deformation and Fracture, pp. 105-110 
    11. Genel, K., Demirkol, M. and Capa, M., 2000, 'Effect of Ion Nitriding on Fatigue Behavior of AISI 4140 Steel,' Materials Science & Engineering, A279, pp. 207-216 
    12. Gustavsson, A. I. and Melander, A., 1992, 'Fatigue Limit Model for Hardened Steels,' Fatigue Fracture Engineering Materials Structure, Vol. 15, No. 9, pp. 881-894 
    13. Genel, K. and Demirkol, ML, 1999, 'Effect of Case Depth on Fatigue Performance of AISI 8620 Carburized Steel,' International Journal of Fatigue, 21, pp. 207-212 
    14. Gabetta, G. and Torri, L., 1992, 'Crack Nucleation and Propagation in Blade Steel Material,' Fatigue Fracture Engineering Materials Structure, Vol. 15, No. 11, pp. 1101-1111 
    15. Fuchs, H. O. and Stephens, R. I., 1980, Metal Fatigue in Engineering, John Wiley & Sons, Pub., pp. 27-34 
  • 이 논문을 인용한 문헌 (2)

    1. 2003. "" KSME international journal, 17(11): 1638~1649     
    2. 2009. "" Journal of mechanical science and technology, 23(2): 420~425     

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