Chinese Journal of Lasers, Volume. 51, Issue 10, 1002320(2024)
Formation Mechanism of Stray Grain in Laser Remelting Zone of DD6 Nickel‑Based Single Crystal Superalloy
Fig. 1. Laser remelting test. (a) Laser cladding equipment; (b) molten pool diagram; (c) map of formed single-track
Fig. 2. Microstructures of DD6 nickel-based single crystal superalloy. (a) Morphology of the substrate collected by optical microscopy; (b) phase composition of dendritic collected by electron microscopy
Fig. 3. Molten-pool morphology and microstructures of each crystal region at different laser powers. (a)‒(d) 1200 W; (e)‒(h) 1500 W
Fig. 4. Dendrite morphology and elemental content measurement points in [010] crystal region after laser remelting. (a) 1200 W; (b) 1500 W
Fig. 5. EBSD of the sample after laser melting. (a) Orientation map with the laser power of 1200 W; (b) orientation map with the laser power of 1500 W; (c) {100} pole figure with the laser power of 1200 W; (d) {100} pole figure with the laser power of 1500 W
Fig. 6. Fusion line morphology and stray grain distribution with the laser power of 1500 W. (a) Smooth fusion line; (b) non-smooth fusion line; (c) point-scan elemental analysis spectrum at point C
Fig. 7. EBSD results of molten pool after remelting. (a) Grain boundary angle with the laser power of 1200 W; (b) grain boundary angle with the laser power of 1500 W; (c) misorientation angle distribution with the laser power of 1200 W; (d) misorientation angle distribution with the laser power of 1500 W
Fig. 8. Relationship between the dendrite growth direction and the temperature gradient
Fig. 9. Geometric model boundary conditions and meshing
Fig. 10. Temperature dependence of thermophysical parameters of DD6 alloy. (a) Density; (b) enthalpy; (c) thermal conductivity; (d) specific heat capacity
Fig. 11. Temperature field distributions of molten pool at different laser powers. (a) 1200 W; (b) 1500 W
Fig. 12. Stress field distribution maps in the molten pool at different laser powers. (a) 1200 W; (b) 1500 W
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Huijun Wang, Pengfei Guo, Jianfeng Geng, Jianjun Xu, Xin Lin, Jun Yu, Hongbo Lan, Guang Yang, Weidong Huang. Formation Mechanism of Stray Grain in Laser Remelting Zone of DD6 Nickel‑Based Single Crystal Superalloy[J]. Chinese Journal of Lasers, 2024, 51(10): 1002320
Category: Laser Additive Manufacturing
Received: Feb. 1, 2024
Accepted: Apr. 2, 2024
Published Online: Apr. 27, 2024
The Author Email: Guo Pengfei (dr2019guopf@163.com)