کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5015245 | 1463728 | 2017 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Modeling of the deformation behavior of single crystalline Nickel-based superalloys under thermal mechanical loading
ترجمه فارسی عنوان
مدل سازی رفتار تغییر شکل از ابررسانای بر پایه نیکل تک بلوری تحت بارگذاری مکانیکی حرارتی
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کلمات کلیدی
سوپرآلیاژهای بر پایه کریستالی نیکل، خستگی مفاصل حرارتی، مفهوم تنش آستانه، مدل سازی، خزش پلاستیک
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
چکیده انگلیسی
The focus of this paper is the simulation of the thermal-mechanical fatigue behavior (TMF) of two single crystalline Nickel-based superalloys in a temperature range between 400 °C and 980 °C. The newly developed rhenium-free alloy Astra-3OptW and the rhenium-free alloy CMSX-6 are analyzed concerning the basic deformation mechanisms, i.e. elasticity, time-independent and time-dependent plasticity contributing to hardening. In detail, the relevant parameters for high temperature deformation are identified from isothermal creep experiments and used in a numerical model to simulate the deformation behavior under instationary thermal and mechanical loading. Special attention is focused on the determination of the hardening by the second phase (γâ²-precipitates) and their influence on time-dependent deformation and relaxation mechanisms. Therefore, the parameters describing the stress and temperature dependence of the creep rate (i.e. stress exponent n and activation energy Q) are interpreted in terms of a threshold stress taking into account the hardening contribution of the γâ²-phase. Thus, only a reduced effective stress is active for plastic deformation. Particular attention is focused on the accurate determination of the threshold stress as a function of temperature and applied stress from the Langeborg-Bergmann-plot. The comparison of the simulated TMF-deformation to the experimental TMF-data clearly indicates the accuracy of the model in predicting the resulting stresses induced by instationary thermal and mechanical loading.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 97, April 2017, Pages 1-8
Journal: International Journal of Fatigue - Volume 97, April 2017, Pages 1-8
نویسندگان
F. Wilhelm, E. Affeldt, E. Fleischmann, U. Glatzel, J. Hammer,