GH4169惯性摩擦焊接过程动态再结晶组织演化的数值模拟

利用MSC.Marc的热力耦合弹塑性有限元模拟技术,建立了GH4169环形件惯性摩擦焊接过程的二维热力耦合有限元模型。考虑到惯性摩擦焊接过程中的温度变化,采用叠加原理对Na Y S建立的GH4169动态再结晶数学模型进行调整。借助MSC.Marc二次开发,将动态再结晶数学模型和有限元模型相结合,对惯性摩擦焊接过程中GH4169合金的动态再结晶组织演化进行数值模拟,得到了焊接过程中的动态再结晶分数和平均晶粒尺寸分布。对接头的宏观形貌和焊缝区的微观组织进行观察分析,发现模拟结果与实验结果吻合较好。

Numerical simulation of microstructure evolution for dynamic recrystallization of GH4169 during inertia friction welding

Using the coupled thermo-mechanical FEM technology of software MSC. Marc, a 2D thermo-mechanical coupled finite dement model for inertia friction welding process of GH4169 super-alloy ring parts was developed. Take into account of the non-isothermal condition during the inertia friction welding, the additivity rule was introduced to adapted the mathematical model for dynamic recrystallization of GH4169 established by Na Y S. By second-development of MSC. Marc, the mathematical model for dynamic recrystallization was combined with the finite model to simulate the microstructure evolution for dynamic recrystallization of GH4169 during the inertia friction welding process. The distributions of dynamic recrystallized fraction and average grain size during the welding process were obtained. The macrostructure of the friction welded joint and the microstructure of welding area was examined and analyzed, it was found that the simulation results agree well with the experimental results.