δ Phase Precipitation of Inconel 718 Ni-Based Superalloy Fabricated by Laser Solid Forming

Fencheng Liu; Feiyue Lü; Hang Ren; Xiaoguang Wang; Xin Lin

doi:10.3788/CJL201845.1202009

Chinese Journal of Lasers, Volume. 45, Issue 12, 1202009(2018)

δ Phase Precipitation of Inconel 718 Ni-Based Superalloy Fabricated by Laser Solid Forming

Fencheng Liu^1、*, Feiyue Lü¹, Hang Ren¹, Xiaoguang Wang¹, and Xin Lin²

¹ National Defence Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang, Jiangxi 330063, China

² State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China

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Figures & Tables(10)

Fig. 1. Morphologies of as-deposited samples under different δ aging treatment time at 890 ℃. (a) 0 min; (b) 5 min; (c) 10 min; (d) 15 min; (e) 30 min; (f) 60 min; (g) 240 min; (h) 480 min; (i) 1200 min

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Fig. 2. Side-growth of δ phases during aging treatment of as-deposited samples

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Fig. 3. Morphologies of as-deposited samples under different δ aging treatment time at 950 ℃. (a) 5 min; (b) 10 min; (c) 15 min; (d) 30 min; (e) 60 min; (f) 240 min; (g) 480 min; (h) 1200 min

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Fig. 4. Morphologies of solution-treated samples under different δ aging treatment time at 890 ℃. (a) 5 min; (b) 10 min; (c) 15 min; (d) 30 min; (e) 60 min; (f) 240 min; (g) 480 min; (h) 1200 min

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Fig. 5. Morphologies of solution-treated samples under different δ aging treatment time at 950 ℃. (a) 5 min; (b) 10 min; (c) 15 min; (d) 30 min; (e) 60 min; (f) 240 min; (g) 480 min; (h) 1200 min

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$Quantitative analysis results of δ phase precipitation. (a) Volume fraction; (b) average length; (c) average width; (d) length-width ratio$

Fig. 6. Quantitative analysis results of δ phase precipitation. (a) Volume fraction; (b) average length; (c) average width; (d) length-width ratio

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Fig. 7. ln[-ln(1-Vδ/VS)] versus lnt

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Table 1. Chemical compositions of Inconel 718 alloy power
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Table 1. Chemical compositions of Inconel 718 alloy power
Element Mass fraction /% Element Mass fraction /%
Ni 51.75 Al 0.63
Cr 19.68 Si 0.23
Fe 18.501 Mn 0.11
Nb 4.91 C 0.034
Mo 3.18 S 0.001
Ti 0.97 P 0.004

Table 2. Process parameters for laser solid forming of Inconel 718 superalloy

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Table 2. Process parameters for laser solid forming of Inconel 718 superalloy

Parameter	Value	Parameter	Value
Laser power /W	200-2200	Spot diameter /mm	3
Scanning velocity /(mm·s^-1)	6-8	Overlap ratio /%	25-40
Powder feeding rate /(g·min^-1)	8-12	Increment of Z-axissingle layer stroke /mm	0.3
Shielding gas flow /(L·min^-1)	6

Table 3. Kinetic parameters of δ phase precipitation
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Table 3. Kinetic parameters of δ phase precipitation
Condition T /℃ α n
As-deposited 890 1.68435×10^-8 1.89685
950 3.33198×10^-3 0.59511
Solution-treated 890 3.56178×10^-8 1.73737
950 5.03828×10^-3 0.49456

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Fencheng Liu, Feiyue Lü, Hang Ren, Xiaoguang Wang, Xin Lin. δ Phase Precipitation of Inconel 718 Ni-Based Superalloy Fabricated by Laser Solid Forming[J]. Chinese Journal of Lasers, 2018, 45(12): 1202009

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