论文标题
用于模拟多晶金属材料中的扩散固体/固相转化的水平设定公式
A level-set formulation to simulate diffusive solid/solid phase transformation in polycrystalline metallic materials -- Application to austenite decomposition in steels
论文作者
论文摘要
关于多晶材料的数字描述及其在热力学处理过程中的进化，存在许多全场数值方法。但是，这些策略在全球范围内致力于对单相材料的重结晶和晶粒生长的建模，或者在不考虑重结晶和相关现象的情况下对相变的建模。因此，能够在多相多晶环境中进行预测的一般数值框架，同时尊重不同微观结构机制的伴随，因此具有主要利益。提出了一种新型的有限元级别的全场数值公式，以在两相金属合金的背景下主要模拟介质尺度上的扩散固相变。在该数值模型中考虑了一个全球动力学框架，能够考虑其他随之而来的机制，例如重结晶和晶粒生长。在钢中的奥氏体分解的背景下，所提出的数值框架通过几个说明性的1D和2D测试案例显示出有希望的，并且与ThermoCalc估计值进行了比较。
Numerous full-field numerical methods exist concerning the digital description of polycrystalline materials and the modeling of their evolution during thermomechanical treatments. However, these strategies are globally dedicated to the modeling of recrystallization and grain growth for single-phase materials, or to the modeling of phase transformations without considering recrystallization and related phenomena. A generalized numerical framework capable of making predictions in a multi-phase polycrystalline context while respecting the concomitance of the different microstructural mechanisms is thus of prime interest. A novel finite element level-set based full-field numerical formulation is proposed to principally simulate diffusive solid-solid phase transformation at the mesoscopic scale in the context of two-phase metallic alloys. A global kinetic framework, capable of accounting for other concomitant mechanisms such as recrystallization and grain growth is considered in this numerical model. The proposed numerical framework is shown to be promising through a couple of illustrative 1D and 2D test cases in the context of austenite decomposition in steels and compared with ThermoCalc estimations.
