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Fatigue Crack Growth Behavior of Ni-Cr-Mo Steel under Acid Fog Environment

산성안개 환경하에서 Ni-Cr-Mo 강의 피로크랙전파거동

Kim, Min-Geon;Im, Yong-Ho;Kim, Man-Gu
김민건;임용호;김만구

  • Published : 2000.07.01

Abstract

To examine the effect of acid fog on the corrosion fatigue behavior in structural steel, fatigue tests under acid fog atmosphere were carried out in comparison with distilled water. The corrosive c omponents contained in acid fog pile up the corrosion products on crack face and show a crack branching and crack tip blunting. Therefore, due to these workings crack growth rate was reduced by decreasing the effective stress range in crack tip rather than under distilled water. Also the effect of sulfuric acid, which is the main component of acid fog, and testing speed on fatigue crack growth were examined. It was found that corrosion behavior was remarkably dependent upon pH and Hz rather than components of acid fog. According as pH and testing speed decrease below a specific value, crack growth was accelerated in comparison with distilled water. This reveals that due to liquid having strong acidity and slow speed of test the crack face dissolution was promoted, so crack closure was disturbed in the process of stress descent.

Keywords

Corrosion Fatigue;Acid Fog Environment;Fatigue Crack Growth;${\Delta}{\cdot}k_{eff}$

References

  1. 유효선, 나의균, 정세희, 1995, '인공해수의 pH에 따른 강용접부의 응력부식균열거동에 관한 연구,' 대한용접학회지, 제13권, 제1호, pp. 510-520
  2. 권영각, 1989, '부식피로,' 대한기계학회지, 제29권, 제2호, pp. 138-143
  3. 김민건, 1991, '구조용 강재에 발생하는 미소피로크랙의 정류요인,' 대한기계학회논문집, 15권, 3호, pp. 880-886
  4. Raquet O., Helie M. and Santarini G., 1996, 'Initiation And Propagation of Stress Corrosion Cracking of Type 304 Austenite Stainless Steel in Hot Aqueous Chloride Solution,' Corrosion, Vol. 52, No. 9, pp. 697-707
  5. 中島正貴, 國技久嗣, 戶梶惠郞, 1991, '大氣中およひ水中における炭素鋼 S45Cの疲勞壽命分布特性,' 日本機械學會論文集, 57卷, 536號, pp. 727-732
  6. 森田辰郞, 淸水 眞佐男, 三寄一博, 1992, '窒化處理を施した純チタンの鹽酸環境下ての疲勞特性,' 日本機械學會論文集, 58卷, 555號, pp. 2040-2045
  7. Magnim T., Chambreuil A. and Bayle B., 1996, 'The corrosion Enhanced Plasticity model for stres corrosion cracking in Ductile fcc alloys,' Acta mater. Vol. 44, No. 4, pp. 1457-1470 https://doi.org/10.1016/1359-6454(95)00301-0
  8. Ganor, E.. Levin, Z. and Pardess, D., 'Determining the Acidity and Chemical Composition of Fog, Haze and Cloud Droplets in Israel', Atmos. Environ., 27A, pp1821-1832, 1993 https://doi.org/10.1016/0960-1686(93)90287-9
  9. Munger, J. W., Jacob, D. J., Waldman, J. M. and Hoffmann, M. R., 'Fogwater Chemistry in an Urban Atmosphere,' Journal Geophys. Res., 88(C9). pp. 5109-5121, 1983
  10. Mangoo.Kim, et al, 1998, 'The Study on the Behavior and Deposition of Acid Precipatation/Chemical Composition of Fog Water at Chunchon(1996-1997),' Journal of Korea Air Pollution Research Association, Vol. 15, No. 5, pp. 491-498
  11. Hileman, B., Acid Fog, 1983, Environ. Sci. Tech., 17(3), 117A-120A
  12. 村野健太郞, 1993, '酸雨の酸性霧,' 裳和傍, pp. 61-95