کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1573330 | 1514676 | 2016 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study of the effect of microstructure heterogeneity on fatigue crack propagation of low-alloyed PM steels
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Powder metallurgy steels frequently withstand cyclic loading in service. Therefore, it is of high importance to thoroughly understand their fatigue properties. A detailed study of the effect of microstructure heterogeneity on fatigue properties of sinter-hardened PM steels was performed using admixed nickel PM steels (FN0208) as well as pre-alloyed PM steels (FL5208). Specimens were pressed and sintered to a density of 7.3Â g/cm3 in order to specifically investigate the effect of microstructural constituents on fatigue properties. Fatigue crack growth rates were measured at four different R-ratios, 0.1, 0.3, 0.5 and 0.7 for both PM steels. The negative effect of increasing the R-ratio on fatigue properties was observed for both alloys. The crack propagation paths were studied using optical microscopy and the tortuosity of the crack paths were compared with their equivalent linear paths. This approach allowed us to determine the effect of microstructure in different fatigue conditions. Fatigue fracture surfaces were also studied using scanning electron microscopy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 667, 14 June 2016, Pages 444-453
Journal: Materials Science and Engineering: A - Volume 667, 14 June 2016, Pages 444-453
نویسندگان
Saba Mousavinasab, Carl Blais,