Effect of Interlayer Cooling on Structure and Tensile Properties of TC17 Titanium Alloy Fabricated by Laser Additive Manufacturing

Bingsen Liu; Shuquan Zhang; Jikui Zhang; Huaming Wang; Yanyan Zhu

doi:10.3788/CJL202249.1402204

Chinese Journal of Lasers, Volume. 49, Issue 14, 1402204(2022)

Effect of Interlayer Cooling on Structure and Tensile Properties of TC17 Titanium Alloy Fabricated by Laser Additive Manufacturing

Bingsen Liu^1,2, Shuquan Zhang^1,2, Jikui Zhang^1,2,3, Huaming Wang^1,2, and Yanyan Zhu^1,2,3、*

Author Affiliations

¹Research Institute for Frontier Science, Beihang University, Beijing 100191, China

²National Engineering Laboratory of Additive Manufacturing for Large Metallic Components, Beihang University, Beijing 100191, China

³Ningbo Institute of Technology, Beihang University, Ningbo 315800, Zhejiang, China

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Figures & Tables(14)

Fig. 1. Coaxial powder feeding laser additive manufacturing. (a) Schematic of process ; (b) as-deposited plates

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Fig. 2. Macroscopic structures of TC17 titanium alloy fabricated by laser additive manufacturing with different interlayer cooling. (a)(c) Sample A; (b)(d) sample B

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Fig. 3. Morphologies of β grain. (a)(c) Sample A; (b)(d) sample B

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$X-ray diffraction patterns of as-deposited TC17 titanium alloy$

Fig. 4. X-ray diffraction patterns of as-deposited TC17 titanium alloy

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Fig. 5. Microstructures of TC17 titanium alloy fabricated by laser additive manufacturing with different interlayer cooling. (a)(c) OM and SEM images of equiaxed grain region in sample A; (b)(d) OM and SEM images of equiaxed grain region in sample B

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Fig. 6. Microstructures of TC17 titanium alloy after triplex heat treatment. (a) OM image of equiaxed grain region in sample A; (b) OM image of equiaxed grain region in sample B; (c) SEM image of equiaxed grain region in sample A; (d) SEM image of equiaxed grain region in sample B; (e) SEM image of grain boundary in equiaxed grain zone of sample A; (f) SEM image of grain boundary in equiaxed grain zone of sample B

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$Longitudinal sections of L-direction tensile fracture of TC17 titanium alloy fabricated by laser additive manufacturing with two kinds of interlayer cooling. (a)(c) Sample A; (b)(d) sample B$

Fig. 7. Longitudinal sections of L-direction tensile fracture of TC17 titanium alloy fabricated by laser additive manufacturing with two kinds of interlayer cooling. (a)(c) Sample A; (b)(d) sample B

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$Tensile fracture morphologies of as-deposited sample A. (a)(c) L-direction; (b)(d) T-direction$

Fig. 8. Tensile fracture morphologies of as-deposited sample A. (a)(c) L-direction; (b)(d) T-direction

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$Tensile fracture morphologies of as-deposited sample B. (a)(c) L-direction; (b)(d) T-direction$

Fig. 9. Tensile fracture morphologies of as-deposited sample B. (a)(c) L-direction; (b)(d) T-direction

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Table 1. Main process parameters of laser additive manufacturing
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Table 1. Main process parameters of laser additive manufacturing
Sample Laser power /kW Scanning speed /(mm/min) Spot diameter /mm Powder feeding rate /(g/h) Interlayer cooling time /min
A 6-8 800-1200 5-6 800-1200 0
B 6-8 800-1200 5-6 800-1200 3

Table 2. Measured chemical compositions of TC17 titanium alloy powder and forming plates (mass fraction, %)
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Table 2. Measured chemical compositions of TC17 titanium alloy powder and forming plates (mass fraction, %)
Material Al Sn Zr Mo Cr Ti Fe H O
Powder 5.01 2.16 2.00 4.14 4.20 Bal. 0.040 0.0062 0.096
Plate A 5.28 2.09 2.02 4.13 4.26 Bal. 0.066 0.0022 0.100
Plate B 5.15 2.16 2.02 4.20 4.24 Bal. 0.016 0.0030 0.100

Table 3. Contents and sizes of different scale α phases in laser additive manufacturing of TC17 titanium alloy

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Table 3. Contents and sizes of different scale α phases in laser additive manufacturing of TC17 titanium alloy

Sample	Treatment	Volume fraction of α_p /%	Volume fraction of α_s /%	Width of α_p /μm	Aspect ratio of α_p	Width of α_GB /μm
A	As-deposited	34.6±1.2	-	0.61±0.13	7.71	0.87
A	THT	49.8±0.6	13.6±0.6	1.01±0.19	4.86	1.85
B	As-deposited	69.7±2.1	-	0.086±0.03	～10	0.105
B	THT	50.6±1.6	12.9±1.6	0.84±0.17	6.12	1.95

Table 4. Tensile properties of TC17 titanium alloy fabricated by laser additive manufacturing with different interlayer cooling
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Table 4. Tensile properties of TC17 titanium alloy fabricated by laser additive manufacturing with different interlayer cooling
Sample Direction UTS /MPa YS /MPa EL /% RA /%
A L 1128 1076 10.5 20.7
T 1106 1054 5.8 18.3
B L 1250 1213 2 3.7
T 1309 1303 0.5 1

Table 5. Tensile properties of TC17 titanium alloy fabricated by laser additive manufacturing after triplex heat treatment
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Table 5. Tensile properties of TC17 titanium alloy fabricated by laser additive manufacturing after triplex heat treatment
Sample Direction UTS /MPa YS /MPa EL /% RA /%
A(THT) L 1175 1136 6.7 9.0
T 1160 1130 3.8 7.0
B(THT) L 1089 1039 9.7 17.7
T 1128 1105 5.0 9.0
Aviation-standard Axial ≥1120 ≥1030 ≥5.0 ≥10.0

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Bingsen Liu, Shuquan Zhang, Jikui Zhang, Huaming Wang, Yanyan Zhu. Effect of Interlayer Cooling on Structure and Tensile Properties of TC17 Titanium Alloy Fabricated by Laser Additive Manufacturing[J]. Chinese Journal of Lasers, 2022, 49(14): 1402204

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Paper Information

Received: Dec. 24, 2021

Accepted: Feb. 18, 2022

Published Online: Jun. 14, 2022

The Author Email: Zhu Yanyan (zhuyy@buaa.edu.cn)

DOI:10.3788/CJL202249.1402204

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Main process parameters of laser additive manufacturing

Table 1. Main process parameters of laser additive manufacturing

Table 2. Measured chemical compositions of TC17 titanium alloy powder and forming plates (mass fraction, %)

Table 2. Measured chemical compositions of TC17 titanium alloy powder and forming plates (mass fraction, %)

Table 3. Contents and sizes of different scale α phases in laser additive manufacturing of TC17 titanium alloy

Table 3. Contents and sizes of different scale α phases in laser additive manufacturing of TC17 titanium alloy

Table 4. Tensile properties of TC17 titanium alloy fabricated by laser additive manufacturing with different interlayer cooling

Table 4. Tensile properties of TC17 titanium alloy fabricated by laser additive manufacturing with different interlayer cooling

Table 5. Tensile properties of TC17 titanium alloy fabricated by laser additive manufacturing after triplex heat treatment

Table 5. Tensile properties of TC17 titanium alloy fabricated by laser additive manufacturing after triplex heat treatment