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J. Mater. Sci. Technol.  2018, Vol. 34 Issue (10): 1843-1850    DOI: 10.1016/j.jmst.2018.02.008
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Vacuum brazing of GH99 superalloy using graphene reinforced BNi-2 composite filler
Duo Liuab, Yanyu Songb, Bin Shib, Qi Zhangb, Xiaoguo Songab(), Hongwei Niub, Jicai Fengab
aState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
bShandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
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Abstract  

A novel graphene reinforced BNi-2 composite filler was developed for brazing GH99 superalloy. The interfacial microstructure of brazed joints was analyzed by field emission scanning electron microscope and a transmission electron microscope. The effects of graphene addition on the microstructure evolution and mechanical properties of brazed joints were investigated, and the strengthening mechanism of graphene was analyzed. The results revealed that due to the addition of graphene, M23(C,B)6 compounds were synthesized in the γ solid solution and brittle boride precipitates near the brazing seam decreased. Graphene was effective in retarding solute atoms diffusion thus impeding the precipitation of borides. Furthermore, the low coefficient of thermal expansion (CTE) of graphene was conducive to relieve stress concentration of the brazed joints during the cooling process. The shear strengths of brazed joints were significantly improved by exerting the strengthening effect of graphene. The maximum shear strengths of the brazed joints were 410.4 MPa and 329.7 MPa at room temperature and 800 °C, respectively.

Key words:  Graphene      GH99 superalloy      Brazing      Microstructure      Mechanical properties     
Received:  15 November 2017      Published:  01 November 2018

Cite this article: 

Duo Liu, Yanyu Song, Bin Shi, Qi Zhang, Xiaoguo Song, Hongwei Niu, Jicai Feng. Vacuum brazing of GH99 superalloy using graphene reinforced BNi-2 composite filler. J. Mater. Sci. Technol., 2018, 34(10): 1843-1850.

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http://www.jmst.org/EN/10.1016/j.jmst.2018.02.008     OR     http://www.jmst.org/EN/Y2018/V34/I10/1843

Cr Co W Mo Si B Fe Al Ti Ni
GH99 superalloy 18.21 6.67 8.03 2.86 - - 0.32 1.15 1.43 Bal.
BNi-2 7.06 - - - 4.54 2.85 3.04 - - Bal.
Table 1  Chemical compositions of GH99 superalloy and BNi-2 (wt%).
Fig. 1.  Microstructure of GH99 superalloy.
Fig. 2.  Morphologies of BNi-2 filler (a) and BNi-2G filler (b).
Fig. 3.  Typical microstructures of GH99 superalloy joints brazed at 1170 °C for 30 min (a) and magnified morphology of DZ.
Spot Ni Cr Si Mo W Fe Other element
A 71.27 14.32 4.42 0.54 1.15 2.56 5.74
B 11.62 46.34 0.01 25.21 14.28 1.53 1.01
C 23.85 40.90 - 19.15 12.94 2.04 1.12
Table 2  Chemical compositions at each spot shown in Fig. 3 (at.%).
Fig. 4.  Microstructures of GH99 superalloy joints brazed at 1090 °C (a), 1130 °C (b), 1170 °C (c) and 1200 °C (d).
Fig. 5.  Magnified images of DZ in Fig. 4 for GH99 superalloy joints brazed at 1090 °C (a), 1130 °C (b), 1170 °C (c) and 1200 °C (d).
Fig. 6.  Effect of brazing temperature on shear strength of GH99 superalloy joints brazed for 30 min.
Fig. 7.  EBSD analysis of grain morphologies (a, b) and distribution of grain size (c, d) of base metal before (a, c) and after (b, d) 1200 °C/30 min brazing process.
Fig. 8.  Microstructures of joints brazed with BNi-2G filler (a) and magnified images of DZ (b).
Fig. 9.  TEM image of BS (a) and SEAD pattern of γ solid solution and M23(C,B)6 (b).
Fig. 10.  Schematic diagram of interfacial microstructure: (a) formation of liquid phase; (b) spreading of liquid phase; (c) isothermal solidification; (d) formation of interface.
Fig. 11.  Room-temperature shear strength and high-temperature shear strength of brazed joints.
Fig. 12.  Fracture morphologies of joints brazed with BNi-2 filler (a, b) and BNi-2G composite filler (c, d) at low (a, c) and high (b, d) magnification.
Spot Ni Cr Si Mo W Co Fe Other element
A 46.20 28.59 1.30 6.58 5.27 5.69 1.16 5.21
B 76.07 9.52 6.79 0.31 0.92 2.51 1.91 1.97
Table 3  Chemical compositions at each spot shown in Fig. 12 (at.%).
Fig. 13.  High-temperature (800 °C) shear fracture morphologies of joints brazed using BNi-2 filler (a) and BNi-2G composite filler (b).
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