کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7990036 | 1516125 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study of γⲠrafting under different stress states - A phase-field simulation considering viscoplasticity
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
The γâ²/γ evolution in nickel superalloys under different stress states and stress values at 1223â¯K was simulated through the phase-field method to study the 45°-type rafting mechanism and the influence of orientation deviation on the γâ²/γ evolution. The simulation results demonstrate that for the shear stress case, 45°-type rafting appears under the external shear stress of 137â¯MPa. In 45°-type rafting, the equivalent stress inhomogeneity in the γ channel induces a directional diffusion of γâ²-forming elements into the low-equivalent-stress areas which are distributed along the diagonal directions. Based on the simulations, a model for the 45°-type rafting mechanism has been proposed. In addition, the influence of orientation deviation on γâ²/γ evolution originates from the introduction of shear stress components. With increasing external stress, the shear stress component is increased, which causes the rafting direction to approach the 45° direction. Furthermore, the existence of orientation deviation accelerates the process of γⲠrafting.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 769, 15 November 2018, Pages 453-462
Journal: Journal of Alloys and Compounds - Volume 769, 15 November 2018, Pages 453-462
نویسندگان
Min Yang, Jun Zhang, Hua Wei, Yan Zhao, Weimin Gui, Haijun Su, Tao Jin, Lin Liu,