电-磁复合场协同作用对激光熔覆层凝固组织的调控研究

在激光熔覆过程中，对熔覆层凝固组织的传统调控是通过改变激光功率、扫描速度、光斑大小等参数来实现的，但此类调控方法只能改变熔覆层熔池的传热边界，调控效果有限。为了实现对熔覆层熔池中传热传质行为的趋向性控制，有效调整凝固组织的形态、大小和方向，利用电-磁复合场的协同作用，产生方向、大小、频率可控的洛伦兹力，驱动或阻碍熔覆层熔池的对流运动，影响其凝固过程。仿真和实验有效证实了电-磁复合场协同作用对熔池所产生的影响力要远大于单一稳态磁场，是一种强有力的熔覆层组织调控手段，并有望提高通过激光组合增材制造的轮机高温部件的疲劳寿命和降低凝固组织的内部缺陷，将其推广应用于熔凝、合金化、焊接等其他激光加工领域。

Abstract

During the laser cladding process, the traditional methods of microstructure adjustment are to change the laser processing parameters, such as laser power, scanning speed and the size of laser beam. However, these methods only change the boundary of heat transfer of laser cladding layer, the regulation effect is limited. In order to achieve the directional control of heat and mass transfer behavior in laser cladding layer and regulate the shape, the size and the direction of the solidification microstructure effectively, one method using the synergistic effect of electric-magnetic field is proposed. This method can induce the Lorenz force, whose direction, magnitude and frequency are controllable. As a means of volume force, the controllable Lorenz force can drive or drag the convection of the molten pool, which affects the solidification process and realizes the adjustment of microstructure. In this research, the higher influence degree of electric-magnetic synergistic effect is verified numerically and experimentally. The application of this method can improve the fatigue life of the high temperature resistance of turbine parts and decrease the internal defects in the solidification microstructure. Meanwhile, this method can be not only applied in laser cladding process, but also used in laser remelting, laser alloying and laser welding process.

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王梁, 宋诗英, 胡勇, 姚建华. 电-磁复合场协同作用对激光熔覆层凝固组织的调控研究[J]. 中国激光, 2015, 42(s1): s103005. Wang Liang, Song Shiying, Hu Yong, Yao Jianhua. Regulation Research on Microstructure of Laser Cladding under Electric-Magnetic Synergistic Effect[J]. Chinese Journal of Lasers, 2015, 42(s1): s103005.

电-磁复合场协同作用对激光熔覆层凝固组织的调控研究

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