کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9703948 | 1463868 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Abnormal near-threshold fatigue crack propagation of Ti alloys: role of the microstructure
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
This study deals with a perplexing phenomenon recently reported on several titanium alloys which were found not to exhibit a threshold in ambient air at room temperature or moderate temperature when tests are run at high mean stress levels and very low stress intensity factor ranges. In such conditions, these materials revealed a stationary regime with a constant growth rate. A comparative study of the condition for the occurrence of this phenomenon has been conducted on three Ti alloys, Ti6246, Ti17 and Ti6242 and other alloys reported in the literature. A special attention is focused on the role of the microstructure on the critical mean stress level. The sensitivity of a titanium alloy to this abnormal behaviour is proposed to be evaluated in term of the ratio of the critical stress intensity factor level to initiate this phenomenon against the fracture toughness of the same material. The volume fraction and the morphology of the α phase appear as a critical microstructure parameters.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 27, Issue 7, July 2005, Pages 773-782
Journal: International Journal of Fatigue - Volume 27, Issue 7, July 2005, Pages 773-782
نویسندگان
C. Sarrazin-Baudoux,