中国激光, 2018, 45 (8): 0802001, 网络出版: 2018-08-11
定向洛伦兹力对激光熔覆熔池排气的影响 下载: 913次
Effect of Directional Lorentz Force on Molten Pool Exhaust in Laser Cladding
图 & 表
图 1. 定向洛伦兹力辅助激光熔覆的示意图
Fig. 1. Schematic of laser cladding assisted by directional Lorentz force
图 2. 粉末形貌。(a)粉末微观结构;(b)内部空心结构
Fig. 2. Powder morphology. (a) Powder microstructure; (b) internal hollow structure
图 5. 不同条件下熔池内部洛伦兹力的分布图。(a)磁场强度0.6 T,电流密度5×106 A/m2,洛伦兹力向下;(b)磁场强度0.6 T,电流密度为5×106 A/m2,洛伦兹力向上
Fig. 5. Lorentz force distributions in molten pool under different conditions. (a) Magnetic field strength of 0.6 T, current density of 5×106 A·m-2, upward Lorentz force; (b) magnetic field strength of 0.6 T, current density of 5×106 A·m-2, downward Lorentz force
图 6. 不同条件下熔覆熔池流场的分布图。(a)磁场强度0 T;(b)磁场强度0.6 T,电流密度为5×106 A/m2,洛伦兹力向上;(c)磁场强度0.6 T,电流密度为5×106 A/m2,洛伦兹力向下
Fig. 6. Flow field distributions in molten pool under different conditions. (a) Magnetic field strength of 0 T; (b) magnetic field strength of 0.6 T, current density of 5×106 A·m-2, Lorentz force is upward; (c) magnetic field strength of 0.6 T, current density of 5×106 A·m-2, Lorentz force is downward
图 7. 不同直径气泡在不同位置条件下的轨迹图。(a)前部位置;(b)中部位置;(c)后部位置;(d)气泡停留位置的统计图
Fig. 7. Trajectory map of bubbles with different diameters at different positions. (a) Front position; (b) middle position; (c) rear position; (d) statistical diagram of bubble park position
图 8. 气泡在不同位置及不同洛伦兹力作用下的轨迹。(a) A点位置;(b) B点位置;(c) C点位置;(d) A点气泡Y方向的速度图
Fig. 8. Trajectory map of bubbles at different positions and under different Lorentz forces. (a) Point A position; (b) point B position; (c) point C position; (d) speed map along Y direction of bubble at point A
图 9. 不同洛伦兹力及不同位置条件下气泡最终停留的位置。(a) A点位置;(b) B点位置;(c) C点位置
Fig. 9. Final park positions of bubble at different positions and under different Lorentz forces. (a) Point A position; (b) point B position; (c) point C position
图 10. 不同条件下熔覆层气孔的分布。(a) B=0 T;(b) B=0.3 T,洛伦兹力方向向上;(c) B=0.6 T,洛伦兹力方向向上;(d) B=0.3 T,洛伦兹力方向向下;(e) B=0.6 T,洛伦兹力方向向下
Fig. 10. Distributions of pores in cladding layers under different conditions. (a) B=0 T; (b) B=0.3 T, upward Lorentz force; (c) B=0.6 T, upward Lorentz force; (d) B=0.3 T, downward Lorentz force; (e) B=0.6 T, downward Lorentz force
表 1Inconel 718粉末的化学成分(质量分数,%)
Table1. Chemical compositions of Inconel 718 powder (mass fraction, %)
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表 2仿真计算所用金属物性参数与激光工艺参数[19]
Table2. Physical parameters of metals and laser process parameters for simulation calculation[19]
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胡勇, 王梁, 李珏辉, 张群莉, 姚建华, Volodymyr Kovalenko. 定向洛伦兹力对激光熔覆熔池排气的影响[J]. 中国激光, 2018, 45(8): 0802001. Hu Yong, Wang Liang, Li Juehui, Zhang Qunli, Yao Jianhua, Volodymyr Kovalenko. Effect of Directional Lorentz Force on Molten Pool Exhaust in Laser Cladding[J]. Chinese Journal of Lasers, 2018, 45(8): 0802001.