Effects of Heat Treatment on Microstructure and Mechanical Property of ATI 718Plus by Laser Additive Manufacturing

Fig. 2. Experimental conditions. (a) Schematic of LMD equipment; (b) heat treatment regime; (c) sampling position of tensile specimen; (d) tensile specimen size

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Fig. 3. Microstructures of as-deposited sample. (a) Macroscopic morphology of XZ surface; (b) SEM morphology at layer band; (c) dendritic morphology of XY plane; (d) microstructure of XZ plane; (e) Laves phase; (f) element line distribution

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Fig. 4. Microstructures of DA sample in XZ plane. (a) Macro-morphology; (b)‒(d) SEM morphologies

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Fig. 5. TTT curves of inter-dendritic region and dendrite core calculated by JMatPro. (a) TTT curve; (b) partial magnification

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Fig. 6. Microstructures of 982 ℃ SA sample in XZ plane. (a) Macro-morphology; (b)‒(d) SEM morphologies

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Fig. 7. Microstructures of 1020 ℃ SA sample in XZ plane. (a) Macro-morphology; (b)‒(d) SEM morphologies

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Fig. 8. Tensile properties of as-deposited sample and samples after different heat treatments. (a) Tensile curves; (b) histogram of tensile results

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$Fracture morphologies of as-deposited sample and samples after different heat treatments. (a) As-deposited sample; (b) DA sample; (c) high magnification morphology of as-deposited sample fracture; (d) 982 ℃ SA sample; (e) 1020 ℃ SA sample; (f) high magnification morphology of 1020 ℃ SA sample fracture$

Fig. 9. Fracture morphologies of as-deposited sample and samples after different heat treatments. (a) As-deposited sample; (b) DA sample; (c) high magnification morphology of as-deposited sample fracture; (d) 982 ℃ SA sample; (e) 1020 ℃ SA sample; (f) high magnification morphology of 1020 ℃ SA sample fracture

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Table 1. Chemical compositions of ATI 718Plus powder (mass fraction, %)
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Table 1. Chemical compositions of ATI 718Plus powder (mass fraction, %)
Ni Cr Fe Al Co Ti Nb Mo
50.87 18.72 9.56 2.29 8.40 0.71 4.35 3.57
52.00 18.80 9.32 2.32 8.86 0.86 3.98 2.49
51.59 18.10 9.26 1.27 8.61 0.98 5.53 3.06

Table 2. Elemental compositions of inter-dendrite region and dendrite core (mass fraction, %)
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Table 2. Elemental compositions of inter-dendrite region and dendrite core (mass fraction, %)
Position Ni Cr Fe Al Co Ti Nb Mo
Dendrite core （point A） 53.34 19.42 9.89 1.76 9.01 0.54 3.14 2.9
Inter-dendrite region （point B） 51.19 18.2 9.34 1.53 8.91 1.43 6.93 2.47

Table 3. Hardness values of as-deposited sample and samples after different heat treatments
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Table 3. Hardness values of as-deposited sample and samples after different heat treatments
Heat treatment regime Hardness /HV
As-deposited sample 338.5
DA sample 457.2
982 ℃ SA sample 447.9
1020 ℃ SA sample 466.4

Table 4. Element compositions of as-deposited sample fracture area (mass fraction, %)
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Table 4. Element compositions of as-deposited sample fracture area (mass fraction, %)
Area Al Ti Nb Mo Cr Fe Co Ni
Area 1 1.75 0.89 5.00 2.79 19.05 9.94 9.29 Bal.
Area 2 2.19 1.02 14.80 3.83 15.54 7.77 8.74 Bal.

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Yiqun Ren, Yuechen Wu, Shuai Chang, Liqun Li, Minqing Wang. Effects of Heat Treatment on Microstructure and Mechanical Property of ATI 718Plus by Laser Additive Manufacturing[J]. Chinese Journal of Lasers, 2024, 51(16): 1602305

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Paper Information

Category: Laser Additive Manufacturing

Received: Oct. 7, 2023

Accepted: Nov. 6, 2023

Published Online: Apr. 17, 2024

The Author Email: Li Liqun (Liliqun@hit.edu.cn), Wang Minqing (minqingw@aliyun.com)

DOI:10.3788/CJL231244

CSTR:32183.14.CJL231244

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical compositions of ATI 718Plus powder (mass fraction, %)

Table 1. Chemical compositions of ATI 718Plus powder (mass fraction, %)

Table 2. Elemental compositions of inter-dendrite region and dendrite core (mass fraction, %)

Table 2. Elemental compositions of inter-dendrite region and dendrite core (mass fraction, %)

Table 3. Hardness values of as-deposited sample and samples after different heat treatments

Table 3. Hardness values of as-deposited sample and samples after different heat treatments

Table 4. Element compositions of as-deposited sample fracture area (mass fraction, %)

Table 4. Element compositions of as-deposited sample fracture area (mass fraction, %)