Probability Approach for Prediction of Pitting Corrosion Fatigue Life of Custom 450 Steel

نویسندگان

  • A. Azizpour Department of Mechanical Engineering, University of Zanjan, Zanjan, Iran
  • A. Salarvand Department of Mechanical Engineering, Islamic Azad University, Doroud Branch, Iran
  • E. Poursaiedi Department of Mechanical Engineering, University of Zanjan, Zanjan, Iran
چکیده مقاله:

In this study, the pitting type of corrosion growth characteristics, fatigue crack initiation and propagation behavior; axial fatigue tests were carried out on precipitation hardened martensitic Custom 450 steel in the air and 3.5wt% NaCl solution. Using the ratio of the depth to the half-width of the pits; (a/c)= 1.5±0.2 the corrosion pit depth growth law was obtained as a function of stress amplitude and elapsed time, t. Fatigue crack growth rates were determined in the near threshold stress intensity factors regime (∆kth). A model was presented for estimation of corrosion fatigue life based on the time to reach critical pit depth (as crack initiation) and crack propagation life. Then. S-N curves were obtained both in air and NaCl solution from axial fatigue testing. Comparison of data from the proposed model and the experimental results (S-N curves) showed good agreement.

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عنوان ژورنال

دوره 31  شماره 10

صفحات  1773- 1781

تاریخ انتشار 2018-10-01

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