Effect of Al Content on Microstructure of GH4169 Alloy Fabricated by Laser Deposition Manufacturing

Lanyun Qin; Xiangda Pan; Chao Wang; Guang Yang; Wei Wang; Xiangming Wang

doi:10.3788/CJL202249.2202007

Chinese Journal of Lasers, Volume. 49, Issue 22, 2202007(2022)

Effect of Al Content on Microstructure of GH4169 Alloy Fabricated by Laser Deposition Manufacturing

Lanyun Qin¹, Xiangda Pan¹, Chao Wang¹, Guang Yang^1、*, Wei Wang¹, and Xiangming Wang²

Author Affiliations

¹College of Mechanical and Electrical Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, China

²Shenyang Aircraft Design Institute, China Aviation Industry Group Corporation, Shenyang 110035, Liaoning, China

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Figures & Tables(15)

Fig. 1. Laser deposition manufacturing of GH4169 alloy. (a) Laser scanning strategy; (b) GH4169 laser deposition shaping sample

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Fig. 2. Morphologies of original and mixed powders.(a) GH4169 powder; (b) Al powder; (c) GH4169＋0.50Al mixed powder; (d) element surface scan image of GH4169＋0.50Al mixed powder with surface scan image of Al element shown in inset; (e) GH4169＋0.85Al mixed power; (f) element surface scan image of GH4169＋0.85Al mixed power with surface scan image of Al element shown in inset

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Fig. 3. Surface scanning images of Al elements in as-deposited samples. (a) GH4169; (b) GH4169＋0.50Al; (c) GH4169＋0.85Al

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Fig. 4. Microstructure morphologies of as-deposited GH4169 alloys with different compositions. (a)(d) GH4169; (b)(e) GH4169＋0.50Al; (c)(f) GH4169＋0.85Al

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Fig. 5. Phase analysis results of as-deposited GH4169 alloys. (a) XRD spectra; (b) partial enlargement

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Fig. 6. SEM morphologies of as-deposited GH4169 alloys with different compositions. (a)(b)GH4169; (c)(d)GH4169＋0.50Al; (e)(f)GH4169＋0.85Al

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Fig. 7. Microstructures of heat treated GH4169 alloys with different compositions. (a) GH4169; (b) GH4169＋0.50Al; (c) GH4169＋0.85Al

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Fig. 8. SEM morphologies of heat treated GH4169 alloys with different compositions. (a) (d) GH4169; (b) (e) GH4169＋0.50Al; (c) (f) GH4169＋0.85Al

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Fig. 9. Microstructure morphologies of GH4169 alloys with different compositions after long time high temperature aging treatment. (a) GH4169; (b) GH4169＋0.50Al; (c) GH4169＋0.85Al

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Fig. 10. SEM morphologies of GH4169 alloys with different compositions after long time high temperature aging treatment. (a) (d) GH4169; (b) (e) GH4169＋0.50Al; (c) (f) GH4169＋0.85Al

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Fig. 11. DSC curves of as-deposited GH4169 alloys with different compositions

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Table 1. Chemical compositions of GH4169 alloy powders
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Table 1. Chemical compositions of GH4169 alloy powders
Element C Mo Ni Fe Cr Al Ti Nb
Mass fraction /% 0.04 2.99 53.00 Bal. 18.47 0.65 1.08 5.04

Table 2. Al contents of three kinds of alloys measured by ICP detection method
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Table 2. Al contents of three kinds of alloys measured by ICP detection method
Alloy Theoretical value Result measured by ICP detection method Relative error
GH4169 0.65 0.55 15.38
GH4169＋0.50Al 1.15 1.01 12.17
GH4169＋0.85Al 1.50 1.46 2.67

Table 3. Compositions in dendrite core, interdendritic region, and Laves phase of as-deposited samples

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Table 3. Compositions in dendrite core, interdendritic region, and Laves phase of as-deposited samples

Alloy	Spot	Location	Mass fraction/ %
Alloy	Spot	Location	Al	Ti	Nb	Si	Cr	Fe	Ni
GH4169	Ⅰ	Dendrite core	0.57	0.59	3.51	0.28	19.14	20.53	54.32
	Ⅱ	Interdendritic region	0.41	0.62	3.24	0.53	21.23	20.92	53.03
	Ⅲ	Laves phase	0	1.70	23.30	1.41	14.50	13.82	38.96
GH4169＋0.50Al	Ⅳ	Dendrite core	1.17	0.87	2.15	0.29	20.31	20.99	54.20
	Ⅴ	Interdendritic region	1.18	1.20	3.82	0.25	20.14	20.28	53.07
	Ⅵ	Laves phase	0.47	1.12	22.55	1.40	13.35	13.68	40.29
GH4169＋0.85Al	Ⅶ	Dendrite core	1.70	0.92	2.27	0.26	20.37	21.45	53.02
	Ⅷ	Interdendritic region	1.56	1.03	4.08	0.17	19.92	18.53	52.48
	Ⅸ	Laves phase	0.50	0.91	23.65	1.03	14.23	12.99	38.41

Table 4. Segregation coefficients of each element in as-deposited alloys
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Table 4. Segregation coefficients of each element in as-deposited alloys
Alloy Al Ti Nb Si Cr Fe Ni
GH4169 0 2.74 7.19 2.66 0.68 0.66 0.73
GH4169＋0.50Al 0.40 0.93 5.90 5.60 0.66 0.67 0.76
GH4169＋0.85Al 0.32 0.88 5.80 6.06 0.71 0.70 0.73

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Lanyun Qin, Xiangda Pan, Chao Wang, Guang Yang, Wei Wang, Xiangming Wang. Effect of Al Content on Microstructure of GH4169 Alloy Fabricated by Laser Deposition Manufacturing[J]. Chinese Journal of Lasers, 2022, 49(22): 2202007

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