Chinese Journal of Lasers, Volume. 45, Issue 4, 402004(2018)
Microstructures and Properties of Laser Welded Dissimilar Ti3Al/GH4169 Joints
Figures & Tables(25)
Fig. 1. Schematic of laser welding of Ti3Al/GH4169 with Ti-Nb/Ti-Ni-Nb/Ni-Cu as composite filling material
Fig. 2. Photograph of laser welded Ti3Al/GH4169 joints with Ti-Ni-Nb as filling material
Fig. 3. Cross sectional BSE image of laser welded Ti3Al/GH4169 joint with Ti-Ni-Nb as filling material
Fig. 4. Cross sectional microstructure of laser welded Ti3Al/GH4169 joint with Ti-Ni-Nb as filling material. (a) Ti3Al/Ti-Ni-Nb interface; (b)(c) Ti-Ni-Nb weld; (d) Ti-Ni-Nb/GH4169 interface
Fig. 5. Microhardness distribution in laser welded Ti3Al/GH4169 joint with Ti-Ni-Nb as filling material
Fig. 6. Cross sectional BSE image of frature of laser welded Ti3Al/GH4169 joint with Ti-Ni-Nb as filling material
Fig. 7. SEM image of tensile fracture of laser welded Ti3Al/GH4169 joint with Ti-Ni-Nb as filling material
Fig. 8. Photograph of laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
Fig. 9. Cross sectional BSE image of laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
Fig. 10. Cross-sectional line scanning result of laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
Fig. 11. Cross sectional microstructures of laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material. (a) Ti3Al/Ti-Nb interface; (b) Ti-Ni-Nb region; (c) Ti-Ni-Nb/Ni-Cu interface; (d) Ni-Cu region;(e) Ni-Cu/GH4169 interface
Fig. 13. Micro-hardness distribution in laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
Fig. 14. Cross sectional BSE image of fracture of laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
Fig. 15. SEM images of tensile fracture of laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
Table 1. 0 XEDS analysis results of tensile fracture of laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
View tableTable 1. 0 XEDS analysis results of tensile fracture of laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
Position Atomic fraction /% Ti Al Ni Nb Cu Fe Cr ① 12.1 3.4 51.3 5.2 20.9 3.5 3.6 ② 5.6 5.0 58.3 2.7 21.4 3.3 3.7 ③ 30.8 - 53.5 11.9 3.1 0.3 0.4 ④ 25.5 - 51.7 15.5 7.3 - -
Table 1. Chemical compositions of GH4169 alloy (mass fraction, %)
View tableTable 1. Chemical compositions of GH4169 alloy (mass fraction, %)
Composition Ti Al Ni Cr Mo Nb Fe Value 0.75-1.15 0.30-0.70 50.0-55.0 17.0-21.0 2.80-3.30 4.75-5.50 Bal.
Table 2. Chemical compositions of filling materials for laser welding (mass fraction, %)
View tableTable 2. Chemical compositions of filling materials for laser welding (mass fraction, %)
Filling material Ti Ni Nb Cu Ti-Nb 37 48 15 - Ti-Ni-Nb 40 - 60 - Ni-Cu - 70 - 30
Table 3. Process parameters in laser welding of Ti3Al/GH4169 with Ti-Ni-Nb as filling material
View tableTable 3. Process parameters in laser welding of Ti3Al/GH4169 with Ti-Ni-Nb as filling material
Filling material Laser power /W Scanning speed / (mm·min-1) Protective gas flow /(L·min-1) Layer height /mm Spot diameter /mm Ti-Ni-Nb 270-350 500-650 25-35 0.2-0.3 0.6-1.5
Table 4. Process parameters in laser welding of Ti3Al/GH4169 with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
View tableTable 4. Process parameters in laser welding of Ti3Al/GH4169 with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
Filling material Laser power /W Scanning speed / (mm·min-1) Protective gas flow /(L·min-1) Layer height /mm Spot diameter /mm Ni-Cu 200-280 450-550 20-30 0.3-0.5 0.6-1.5 Ti-Nb 240-320 500-600 20-30 0.3-0.5 0.6-1.5 Ti-Ni-Nb 270-350 500-650 25-35 0.3-0.5 0.6-1.5
Table 5. Chemical compositions of typical phases in laser welded Ti3Al/GH4169 joint with Ti-Ni-Nb as filling material and the corresponding deduced phases
View tableTable 5. Chemical compositions of typical phases in laser welded Ti3Al/GH4169 joint with Ti-Ni-Nb as filling material and the corresponding deduced phases
Position Atomic fraction /% Deduced phase Ti Al Ni Nb Fe Cr 1 52.5 1.7 27.0 15.2 1.9 1.7 Ti-Ni-Nb alloy 2 43.1 1.3 17.0 35.3 1.8 1.5 Nb, Ti solid solution 3 14.4 - 2.2 83.4 - - Nb 4 51.5 - 34.5 14.0 - - Ti-Ni-Nb alloy 5 26.9 - 8.8 64.3 - - Nb, Ti solid solution 6 0.3 - - 99.7 - - Nb 7 56.6 - 32.1 11.3 - - Ti-Ni-Nb alloy 8 - - 0.8 99.2 - - Nb
Table 6. Tensile strength at room temperature of laserwelded Ti3Al/GH4169 joint with Ti-Ni-Nb as filling material
View tableTable 6. Tensile strength at room temperature of laserwelded Ti3Al/GH4169 joint with Ti-Ni-Nb as filling material
Experiment No. 1 2 3 Value /MPa 102 154 132 Average value /MPa 129
Table 7. XEDS analysis results of tensile fracture of laser welded Ti3Al/GH4169 joint with Ti-Ni-Nb as filling material
View tableTable 7. XEDS analysis results of tensile fracture of laser welded Ti3Al/GH4169 joint with Ti-Ni-Nb as filling material
Item Atomic fraction /% Deduced phase Ti Al Ni Nb Fe Cr Content 32.2 0.7 44.3 18.2 1.7 2.9 Ti-Ni-Nb alloy
Table 8. Chemical compositions of typical phases in laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material and the corresponding deduced phases
View tableTable 8. Chemical compositions of typical phases in laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material and the corresponding deduced phases
Position Atomic fraction /% Deduced phase Ti Al Ni Cu Nb Fe Cr 9 53.5 1.5 8.2 3.8 32.1 0.4 0.5 (Ti, Nb) solid solution 10 / / 0.6 / 99.4 / / Nb 11 49.5 1.5 7.6 4.3 35.9 1.2 / (Ti, Nb) solid solution 12 46.8 0.7 19.7 3.3 27.3 1.3 0.9 Ti-Ni-Nb alloy 13 50.0 / 31.0 5.0 14.0 / / Ti-Ni-Nb alloy 14 33.1 / 7.3 1.1 58.5 / / (Ti, Nb) solid solution 15 / / / / 100.0 / / Nb 16 / / / / 100.0 / / Nb 17 69.5 / 0.9 / 29.6 / / (Ti, Nb) solid solution
Table 9. Tensile strength at room temperature of laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
View tableTable 9. Tensile strength at room temperature of laser welded Ti3Al/GH4169 joint with Ti-Nb/Ti-Ni-Nb/Ni-Cu as filling material
Experiment No. 1 2 3 Value 172 174 196 Average value /MPa 180
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Chen Bingqing, Xiong Huaping, Sun Bingbing, Wei Zhenwei, Li Wanqing. Microstructures and Properties of Laser Welded Dissimilar Ti3Al/GH4169 Joints[J]. Chinese Journal of Lasers, 2018, 45(4): 402004
Paper Information
Category: laser manufacturing
Received: Jul. 3, 2017
Accepted: --
Published Online: Apr. 13, 2018
The Author Email: Bingqing Chen (hwtkjcbq1984@163.com)
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