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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Computer Simulation of C-N-V Precipitates Evolution Based on Local Concentration Fluctuations
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Computer Simulation of C-N-V Precipitates Evolution Based on Local Concentration Fluctuations

机译：基于局部浓度波动的C-N-V降水演化计算机模拟

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摘要

From a "macroscopic" point of view, steel composition is assumed to vary smoothly along its microstructure. A closer look reveals that, on the atomic level the material composition does not change so smoothly. Single atoms jump randomly along the crystal lattice due to their thermal energy. These random jumps create sporadic zones of the crystal with higher concentration of certain species, and they are responsible for many phenomena, such as precipitation, Ostwald ripening, some phase transformations... This paper proposes a model to simulate the evolution of C-N-V precipitates in microalloyed steels heat treated in the range of warm temperatures (800-900 ℃); when the matrix is austenite (fcc), thus taking into account for the local composition fluctuations. The model works by dividing the space into very small cells, containing a single atomic cell each. If during the random movement of atoms a cell that touches a precipitate reaches some critical composition, it is very easy to stick it to the precipitate by changing its "phase". But it is also possible that some atoms escape from the precipitate by jumping to the austenitic matrix. Both processes happening simultaneously, and which one is leading depends on the atoms energy, i.e. system temperature.
机译：从“宏观”的观点来看，假定钢成分沿其微观结构平滑变化。仔细观察发现，在原子水平上，材料组成变化不那么平稳。单原子由于其热能而沿晶格随机跳跃。这些随机跃迁产生了某些物种较高浓度的晶体零星区域，它们与许多现象有关，例如降水，奥斯特瓦尔德熟化，某些相变……。在高温（800-900℃）范围内进行热处理的微合金钢；当基体是奥氏体（fcc）时，因此考虑了局部成分的波动。该模型通过将空间分成非常小的单元而工作，每个单元都包含一个原子单元。如果在原子的随机运动过程中，接触沉淀的细胞达到某种临界组成，则很容易通过改变其“相”将其粘附到沉淀上。但是也有可能某些原子通过跳到奥氏体基体而从沉淀物中逸出。这两个过程同时发生，哪个过程领先，取决于原子的能量，即系统温度。

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