Performance of GH4169 brazed joint using a new designed nickel-based filler metal via cluster-plus-glue-atom model

doi:10.1016/j.jmst.2019.08.028

Abstract

Abstract:

A novel Ni-Cr-Si-B filler metal with the cluster formula of [Cr-Ni₁₂]B₂Cr + [B-Ni₈Cr]BSiCr based on the cluster-plus-glue-atom model was designed for vacuum brazing GH4169 alloy. The effect of brazing temperature and brazing time on microstructure and shear strength of GH4169 alloy joints was investigated. The brazed seam was mainly composed of γ-Ni solid solution. (Nb, Ti)-rich phase and (Cr, Nb, Mo)-rich borides distributed in diffusion zones. The diffusion and aggregation of B, Cr, Nb, and Mo resulted in the variation of phase contrast and morphology of borides. Coarse precipitations in the joint brazed at 1240 ℃ consisted of borides, Laves phase and δ phase. The shear strength of joints was principally dominated by the brittle precipitations in diffusion zone, and the homogenization of microstructure improved the room-temperature shear strength to 820 MPa with the high-temperature shear strength of 627 MPa for the joint brazed at 1240 ℃/20 min. The joint fractured in diffusion zone and brazed seam, and the existence of borides and Laves phase in diffusion zone provide the potential origin for crack growth.

Key words: Cluster-plus-glue-atom model, GH4169 alloy, Brazing, Microstructure, Shear strength

Honggang Dong, Yueqing Xia, Xinxing Xu, Gul Jabeen Naz, Xiaohu Hao, Peng Li, Jun Zhou, Chuang Dong. Performance of GH4169 brazed joint using a new designed nickel-based filler metal via cluster-plus-glue-atom model[J]. J. Mater. Sci. Technol., 2020, 39: 89-98.

Figures/Tables 20

Fig. 1. The principle clusters of [Ni-Ni12] in γ-Ni phase (a) and [B-Ni9] in Ni3B phase (b).

Table 1 Chemical composition (wt. %) of GH4169 alloy and filler metal.

Material	Cr	Fe	Mo	Nb	Al	Ti	B	Si	Ni
GH4169	18.06	18.90	2.96	5.43	0.58	0.94	-	0.06	Bal
Filler metal	14.31	-	-	-	-	-	2.98	1.93	Bal

Fig. 2. Microstructure of GH4169 alloy.

Fig. 3. The XRD pattern (a) and DTA curve of the filler metal (b).

Fig. 4. Schematic of sample assembly (a) and shear test fixture (b).

Fig. 5. Microstructure of the joint brazed at 1150 ℃ for 20 min (a), and the magnified images of DZ (b, c).

Table 2 Chemical composition (at. %) of the marked spots in Fig. 5.

Spot	Ni	Cr	B	Si	Fe	Mo	Nb	Ti	Al	Possible phase
1	72.6	17.3	-	2.8	4.8	0.3	1.1	0.7	0.3	γ-(Ni) solid solution
2	53.2	20.3	-	0.1	20.0	1.4	2.7	1.2	1.0	Substrate in DZ
3	2.2	1.0	-	-	0.8	1.1	85.5	9.5	-	(Nb, Ti)-rich phase
4	2.5	28.4	46.3	-	1.8	5.6	14.4	1.0	-	(Cr, Nb, Mo)-rich borides
5	8.3	15.1	43.1	-	5.8	10.5	16.1	0.9	0.1	(Cr, Nb, Mo)-rich borides

Fig. 6. EPMA line scanning results of DZ corresponding to Fig. 5(c).

Fig. 7. EPMA elemental distribution of the joint brazed at 1150 ℃ for 20 min.

Fig. 8. Interfacial microstructure of joints and magnified images of DZ at brazing temperature of 1150 ℃ (a, b), 1180 ℃ (c, d), 1210 ℃ (e, f), and 1240 ℃ (g, h) for 20 min.

Fig. 9. EPMA elemental mapping images of the joint brazed at 1240 ℃ for 20 min.

Fig. 10. EPMA elemental mapping images of precipitation phase marked in Fig. 9.

Table 3 Chemical composition (at. %) of marked spot in Fig. 10.

Spot	Ni	Cr	B	Si	Fe	Mo	Nb	Ti	Al	Possible phase
1	69.2	3.9	-	-	4.7	0.5	17.4	4.1	0.2	δ phase-Ni₃(Nb, Ti)
2	44.5	14.2	-	1.6	13.3	3.4	21.8	1.0	0.2	Laves phase

Fig. 11. Shear strength of joints brazed at different temperatures for 20 min.

Fig. 12. Microstructure of joints brazed at 1150 ℃ for 10 min (a), 20 min (b), 40 min (c), magnified morphology (d-f) of the zones marked with d, e, f.

Fig. 13. Shear strength of joints brazed at 1150 ℃ for different time.

Fig. 14. Fracture path (a) and fracture morphology (b-d) of joint brazed at 1150 ℃ for 20 min; Fracture path (e) and fracture morphology (f-h) of joint brazed at 1240 ℃ for 20 min.

Table 4 Chemical composition (at. %) of marked spots in Fig. 14.

Spot	Ni	Cr	Fe	Mo	Nb	Si	Ti	Al	Possible phase
1	53.67	21.36	20.45	1.12	2.20	0.08	0.90	0.21	Substrate in DZ
2	70.05	18.48	4.09	0.43	1.07	4.79	0.41	0.69	γ-Ni solid solution
3	40.75	14.66	12.70	3.42	24.81	1.85	0.90	0.92	Laves phase
4	52.62	20.34	18.74	1.71	3.44	0.36	1.05	1.74	Substrate in DZ

Fig. 15. Room-temperature shear strength and high-temperature shear strength of the joint brazed at 1240 ℃/20 min (a); Fracture surface of high-temperature shear sample (b).

Table 5 Chemical composition (at. %) of marked spots in Fig. 15.

Spot	Ni	Cr	Fe	Mo	Nb	Si	Ti	Al	Possible phase
1	51.62	20.76	19.27	1.98	3.40	0.39	1.16	1.42	Substrate in DZ
2	52.22	19.88	18.83	2.18	4.00	0.37	1.14	1.38	Substrate in DZ

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