کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1448388 | 988672 | 2010 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Tension/compression asymmetry of a single-crystal superalloy in virgin and degraded condition
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Tension/compression asymmetry of a single-crystal superalloy in virgin and degraded condition Tension/compression asymmetry of a single-crystal superalloy in virgin and degraded condition](/preview/png/1448388.png)
چکیده انگلیسی
The mechanical behaviour at room temperature of a single-crystal superalloy exposed to long-term ageing at elevated temperature has been investigated, a topic important for the material's resistance to thermal-mechanical fatigue. Specimens with several different crystallographic orientations were plastically deformed in either tension or compression before and after the long-term furnace exposure. While the thermally activated degradation of the microstructure causes a reduction in yield limit of up to 25% for specimens initially deformed in the [0 0 1] and [0 1 1] directions, none or only moderate reduction was seen for specimens initially deformed along the [1¯11] direction. This can be explained by the strong correlation between yield limit reduction and the amount of γⲠcoarsening. By introducing an isotropic degradation function in a newly developed crystal plasticity model, the constitutive behaviour of both virgin and degraded material has been described with good agreement with the experimental results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 58, Issue 15, September 2010, Pages 4986-4997
Journal: Acta Materialia - Volume 58, Issue 15, September 2010, Pages 4986-4997
نویسندگان
D. Leidermark, J.J. Moverare, S. Johansson, K. Simonsson, S. Sjöström,