کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7893965 1509962 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modelling of corrosion fatigue crack initiation on martensitic stainless steel in high cycle fatigue regime
ترجمه فارسی عنوان
مدل سازی آغاز گشت خستگی خوردگی بر روی فولاد ضد زنگ مارنزیتی در رژیم خستگی چرخه ی بالا
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
This paper presents an analytical model for assessing the corrosion fatigue crack initiation life on a martensitic stainless steel X12CrNiMoV12-3 in high cycle fatigue regime (between 105 and 107 cycles). Based on in-situ electrochemical measurements during corrosion fatigue tests in NaCl aqueous solution, the corrosion fatigue crack initiation mechanism was identified. Two main stages were investigated: (i) the fracture of the passive film by slip bands and (ii) the free dissolution of the metal developing fatigue crack initiation from a critical corrosion defect. The depassivation stress threshold corresponds to the median fatigue strength at 107 cycles for fatigue corrosion tests. For an applied stress range less than this threshold, the depassivation phenomenon was not observed at 107 cycles and no crack initiation occurred. The proposed model takes into account the depassivation process induced by the slip bands emergence at the specimen surface and the corrosion rate under cyclic loading. The experimental results are compared to the proposed model taking into account mechanical and electrochemical material parameters.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Corrosion Science - Volume 133, 1 April 2018, Pages 397-405
نویسندگان
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