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Investigation on the transient phenomena during the evolution of melt pool

机译：熔池进化过程中瞬态现象的调查

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The melt pool is the general process of the laser additive manufacture. A deep understanding of the evolution of melt pool will facilitate obtaining an optimum mechanical performance. In this paper a novel 2D transient model smoothly incorporating a multiphase capture method is presented and validated. The investigations on the transient phenomena and the effects of two different energy input patterns on evolution of the melt pool are carried out. The results show that with continuously high energy input, the melt pool gradually grows. The deformation of free surface, the velocity and temperature all increases. After quenching, the melt pool continuously shrinks. As the laser energy per unit length (LEPUL) increases or even when the LEPUL keeps the same but scan speed and laser power increase, the shapes of the free surface change significantly and the heat transfer in workpiece also becomes faster.
机译：熔池是激光添加剂制造的一般过程。深入了解熔池池的演变将有助于获得最佳的机械性能。在本文中，提出并验证了一种新的2D瞬态模型，并验证了多相捕获方法。进行了对瞬态现象的调查及两种不同能量输入模式对熔池进化的影响。结果表明，由于连续的能量输入，熔体池逐渐增长。自由表面的变形，速度和温度都增加。淬火后，熔池池连续收缩。随着每单位长度（LEPUL）的激光能量增加甚至Lepul保持相同但扫描速度和激光功率增加，自由表面的形状显着变化，工件中的热传递也变得更快。

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