IJE TRANSACTIONS A: Basics Vol. 31, No. 10 (October 2018) 1773-1781   

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A. Salarvand, E. Poursaeidi and A. Azizpour
( Received: November 10, 2017 – Accepted in Revised Form: August 17, 2018 )

Abstract    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.


Keywords    Corrosion Fatigue, Corrosion Pit, Crack Propagation, High Cycle Fatigue, Custom 450 Steel



در این مطالعه، جهت ارزیابی مشخصات رشد حفره خوردگی، شروع ترک خستگی و رفتار رشد، آزمون¬های خستگی محوری بر روی فولاد مارتنزیتی رسوب سختی شده Custom 450 در هوا و محلول 5/3 درصد NaCl انجام شد. با در نظر گرفتن نسبت عمق به نصف عرض حفره¬ها بصورت ، قانون رشد عمق حفره خوردگی به عنوان تابعی از دامنه تنش σa و زمان سپری شده t تخمین زده شد. نرخ¬های رشد ترک خستگی در نواحی نزدیک فاکتور شدت تنش آستانه تعیین شدند و مدلی برای تخمین عمر خستگی خوردگی بر اساس زمان رسیدن به عمق بحرانی حفره و عمر رشد ترک ارائه شد. سپس منحنی¬های S-N از آزمایش¬های خستگی محوری در هوا و محلول NaCl بدست آمدند که مقایسه داده¬های مدل پیشنهادی با نتایج آزمایشگاهی (منحنی¬های S-N) توافق خوبی را نشان داد.


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