کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7171457 | 1463710 | 2018 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Frequency and hold time influence on crack growth behavior of a 9-12% Cr ferritic martensitic steel at temperatures from 300â¯Â°C to 600â¯Â°C in air
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Due to an increase of renewable energies proportion, e.g. wind power and photovoltaics, which cannot supply energy constantly, modern power plants must be able to be operated flexibly in order to compensate the residual load. As a consequence of increasing alternating load, fatigue damage becomes more and more important, while creep damage caused by ever shorter holding times at high operating temperature decreases. In this study a turbine bypass valve, one of the most fatigue loaded power plant components, manufactured from widespread standard 12% Cr ferritic/martensitic steel X20 was investigated. Fatigue crack growth experiments showed that the crack growth rate increases slightly with decreasing frequency (20â¯Hzâ¯ââ¯5â¯Hz). In hold time tests (300â¯sâ¯ââ¯600â¯s, effective frequency 3.33â¯Ãâ¯10â3 Hzâ¯ââ¯8.33â¯Ãâ¯10â4), larger crack propagation rates per cycle occur than in the fatigue crack growth experiments with 5 and 20â¯Hz. In comparison to pure cyclic loading maximum load holding time further required significantly higher ÎK values to start crack growth.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 112, July 2018, Pages 165-172
Journal: International Journal of Fatigue - Volume 112, July 2018, Pages 165-172
نویسندگان
T. Fischer, B. Kuhn,