电子束选区熔化热行为数值模拟的研究现状

Research Status of Numerical Simulation of Electron Beam Selective Melting Thermal Behavior

电子束选区熔化成型件经历了复杂热历史,从而产生多尺度微观结构,热历史数据对于分析微观组织形成有重大作用。复杂的微熔池冶金行为导致温度-时间-空间数据难以通过实验手段获得,数值模拟技术作为一种新的技术手段,为解决该问题提供了新思路。本文从温度场数学理论基础、仿真流程、热-力耦合模拟、熔池热力学模拟、及热缺陷机制几个方面综述了电子束选区熔化热行为数值模拟的研究现状,对电子束选区熔化热行为数值模拟存在的挑战和未来前景展开了论述。

Electron beam selective melting parts experienced complex thermal history,resulting in multi-scale microstructures.Thermal history data play an important role in microstructure formation analysis.The complex metallurgical behavior of micro-melting pool makes it difficult to obtain the temperature-time-spatial data by experimental means.As a new technical method,numerical simulation technology provides a new idea to solve this problem.In this paper,the research status of numerical simulation of electron beam selective melting thermal behavior was reviewed from the aspects of mathematical theory of temperature field,simulation process,thermal-mechanical coupling simulation,thermodynamic simulation of molten pool and thermal defect mechanism.The challenges and future prospects of numerical simulation of electron beam selective melting thermal behavior were discussed.