کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1581816 | 1514862 | 2008 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Grain orientation effects on the growth of short fatigue cracks in austenitic stainless steel
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The influence of the grain orientation on short crack growth was studied in fatigued austenitic stainless steel (316L). Global and mesotexture were analysed using the electron backscattering diffraction (EBSD) technique in the scanning electron microscope (SEM). For two specimen types with and without preferred ã1Â 0Â 0ã oriented grains, respectively, the propagation rates of naturally grown short cracks were estimated. In both cases the damage evolution starts at grain boundaries, especially at twin boundaries, but is dominated later by transcrystalline propagating “TC”-cracks. Shorter fatigue life is correlated with a greater portion of TC-crack segments showing relatively high propagation rates. The expected acceleration of the crack propagation by plastic blunting/resharpening via double slip in a global texture with many ã1Â 0Â 0ã oriented grains of high slip symmetry will be overcompensated by small axial stresses within the elastically “weak” ã1Â 0Â 0ã grains. This agrees with the larger fatigue life of such specimens.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 496, Issues 1â2, 25 November 2008, Pages 59-66
Journal: Materials Science and Engineering: A - Volume 496, Issues 1â2, 25 November 2008, Pages 59-66
نویسندگان
C. Blochwitz, S. Jacob, W. Tirschler,