• Title/Summary/Keyword: carbonitrided treatment

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A Study on Stress Analysis and Fatigue Behaviors of Carbonitrided Cr-Mo(SCM415) Steel - About the Prediction of Fatigue Strength - (침탄질화 처리된 크롬-몰리브덴(SCM415)강의 피로거동 및 응력해석 (2) -피로강도의 예측을 중심으로-)

  • 송삼홍;이상훈
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.5
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    • pp.160-167
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    • 2000
  • In this research, the fatigue behaviors of carbonitrided Cr-Mo(SCM415) steel are examined. From fatigue test results, we propose a modified fatigue strength evaluation model and modified formulae. That is, we develop improved models fur evaluating and predicting the fatigue strength of carbonitrided SCM415 by modifying specific terms in the Murakami and Endo's model which is the representative fatigue strength evaluation formulae fur high strength steel.

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Analysis of the Rolling Contact Fatigue of the Shot Peened Ball Bearing by X-ray Diffraction (X선회절에 의한 SHOT PEENING처리 구름베어링의 구름접촉 피로해석)

  • 이한영
    • Tribology and Lubricants
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    • v.13 no.2
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    • pp.39-45
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    • 1997
  • The shot peening treatment were conducted for improving the strength of rolling contact fatigue of machine element like a gear. This paper was undertaken to analyze the influence of shot peening treatment for inner race of ball bearing on the rolling contact fatigue. Shot peening treatment were applied to the full hardened and the carbonitrided bearing. And the rolling contact fatigue life test and X-ray diffraction test were carried out. The results of this study showed that the fatigue life of ball bearing in the clean and the contaminated oil could be improved by shot peening treatment. This effect was found to be more pronounced to the full hardened bearing. These facts might be due to the generation of compressive residual stress and the strain hardening of surface layer by shot peening treatment. The failure of the shot peened bearing were presumed to initiate at surface.

Analysis of rolling contact fatigue of shotpeened ball bearing by X-ray diffraction (X선회절에 의한 SHOTPEENING처리 구름베어링의 구름접촉피로해석)

  • 이한영;이동엽
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1996.10a
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    • pp.207-212
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    • 1996
  • The shotpeening treatment were conducted for improving the strength of rolling contact fatigue of machine element like a gear. This paper was undertaken to analyze the influence of shotpeening treatment for inner race of ball bearing on the roiling contact fatigue. Shotpeening treatment were applied to the full hardened and the carbonitrided bearing. And the rolling contact fatigue life test and X-ray diffraction test were carried out. The results of this study showed that the fatigue life of ball bearing in the clean and the contaminated oil could be improved by shotpeening treatment. This effect was found to be more pronounced to the full hardened bearing.

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A Study for the Prediction Fatigue Limit in a Case Hardening Material (표면경화재의 피로한도 예측에 대한 연구)

  • 이상훈;박원태
    • Journal of the Korean Society of Safety
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    • v.14 no.4
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    • pp.20-27
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    • 1999
  • The standard of the allowed stress in designing components such as shafts used in machinery and aircraft should be determined. It is very important to estimate fatigue strength of a component analytically, because service stress of the components is usually under the level of its fatigue limit. Improving the fatigue strength of each component in machinery is essential for high performance, lightness, and endurance. Surface treatment of components is widely used for these purpose. In this research, the fatigue behaviors of SCM415 steel and carbonitried SCM415 steel are examined. In the analysis of the fatigue behaviors of the carbonitrided SCM 415 steel, we propose a modified fatigue strength evaluation model and modified formulae.

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A Study on Stress Analysis and Fatigue Behaviors of Carbonitried Cr-Mo(SCM415) Steel -About Various Factors Having an Effect on Fatigue Strength- (침탄질화 처리된 크롬-몰리브덴(SCM415)강의 피로거동 및 응력해석 -피로강도에 영향을 주는 제 인자를 중심으로 -)

  • 송삼홍;이상훈
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.8
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    • pp.135-144
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    • 1998
  • In this research, the fatigue behaviors of Cr-Mo(SCM415) steel and carbonitrided CrMo(SCM415) steel are examined. The description of experiments in detail as follows. For SCM415 and carbonitried Cr-Mo(SCM415) steel, smooth specimens and hole defected specimens are fabricated and tested under a rotary bending tester, respectively. By performing the rotary bending fatigue test for smooth and hole defected specimens, the characteristics of the fatigue strength are examined for parameters such as tensile strength, hardness at surface, and residual stresses.

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