کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1580705 | 1514840 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of load ratio and hydrogen concentration on the crack growth rate in Zr-2.5Nb tubes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Crack growth rates (CGR's) were determined under sustained and cyclic loads using 17 mm compact tension and cantilever beam specimens taken from Zr-2.5Nb tubes charged to 6-100 ppm H. The cyclic load effect on the CGR was investigated at 250 °C where load ratios, R were varied from 0.13 to 1 with a constant Kmax. Under sustained loads, the CGR of the Zr-2.5Nb tube increased with supersaturation of hydrogen, ÎC and leveled off above 20-35 ppm H of the ÎC. Under cyclic loads with 1 cycle/min, the CGR at 250 °C decreased with decreasing R: 3.2 Ã 10â8 m/s at R = 1 and 4.8 Ã 10â9 m/s at R = 0.13. The striation spacing, corresponding to the critical hydride length, decreased with decreasing R, indicating easier cracking of the hydrides under cyclic loads. The decreased CGR under cyclic loads and its dependence on the ÎC are discussed using Kim's delayed hydride cracking model.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 520, Issues 1â2, 15 September 2009, Pages 147-152
Journal: Materials Science and Engineering: A - Volume 520, Issues 1â2, 15 September 2009, Pages 147-152
نویسندگان
Young S. Kim, Albertas Grybenas,