頁籤選單縮合
題 名 | Macro-Micro Modeling of Solidification=巨微觀之凝固模式分析 |
---|---|
作 者 | 趙隆山; 杜武昌; | 書刊名 | Proceedings of the National Science Council : Part A, Physical Science and Engineering |
卷 期 | 23:5 1999.09[民88.09] |
頁 次 | 頁622-629 |
分類號 | 440.3 |
關鍵詞 | 凝固模式; 材料形成; Macro-micro modeling; Solidification; Nucleation; Cylindrical casting; |
語 文 | 英文(English) |
英文摘要 | To solve solidification problems, macro-models are generally applied. Macro-micro models, by considering the formation of microstructures in terms of nucleation and growth, can obtain better results than can macro-models. Except for temperature distributions, macro-micro models can offer more information about the solidification process, including undercooling, grain size, grain density etc. These data can be used to predict the mechanical properties of materials directly. In this paper, two macro-micro models are built to investigate the equiaxed solidification of eutectic. One macro-micro model considers the nucleation step, and the other does not (assuming that nucleation occurs instantaneously). An experimental example of a cylindrical casting is used to test these models. The finite difference method is utilized to solve the heat transfer problem, and the source term method is employed to handle the released latent heat. From a comparison with the experimental result, the computed cooling curve is found to be very close to the experimental one. From the computational results, it is found that a higher cooling rate yields the grea . |
本系統中英文摘要資訊取自各篇刊載內容。