Microstructure and Mechanical Properties of TiAl Alloy Prepared by Laser Melting Deposition

Feng Zhang; Hangyu Yue; Bingbing Sun; Ruifeng Li; Haisheng Zhao; Youxing Yao; Yibin Pang

doi:10.3788/LOP231142

Laser & Optoelectronics Progress, Volume. 61, Issue 9, 0914010(2024)

Microstructure and Mechanical Properties of TiAl Alloy Prepared by Laser Melting Deposition

Feng Zhang^1,2, Hangyu Yue², Bingbing Sun^1,3、*, Ruifeng Li², Haisheng Zhao^1,3, Youxing Yao², and Yibin Pang¹

Author Affiliations

¹HFYC (Zhenjiang) Additive Manufacturing Co., Ltd., Zhenjiang 212132, Jiangsu, China

²School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China

³AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

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Figures & Tables(16)

Fig. 1. Properties of Ti-48Al-2Cr-2Nb pre-alloyed powder. (a) Macromorphology map; (b) surface micromorphology map

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Fig. 2. Schematic diagram of LMD forming TiAl alloy components

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Fig. 3. Dimensional diagram of tensile specimen and micro CT specimen

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Fig. 4. TiAl alloy component formed by LMD. (a) Without preheating; (b) with induction preheating

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Fig. 5. CT results of TiAl alloy samples formed by LMD with and without preheating. (a) Micro-nano CT reconstruction diagram (without preheating); (b) pore size distribution (without preheating); (c) micro-nano CT reconstruction diagram (with preheating); (d) pore size distribution (with preheating)

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Fig. 6. Optical microstructures of TiAl alloy samples at different heights. (a) Top macrostructure; (b) top microstructure; (c) middle macrostructure; (d) middle microstructure; (e) bottom macrostructure; (f) bottom microstructure

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Fig. 7. EDS area scanning images of the middle of TiAl alloy formed by LMD. (a) SEM; (b) Ti; (c) Al; (d) Cr; (e) Nb

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Fig. 8. EBSD images of TiAl alloy formed by LMD. (a) Phase distribution map; (b) inverse pole figure (IPF)

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Fig. 9. Effect of preheating on average KAM value. (a) KAM diagram of TiAl alloy without preheating; (b) KAM diagram of TiAl Alloy with preheating

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Fig. 10. Mechanical properties of TiAl alloy formed by LMD. (a) Microhardness changes with height; (b) tensile properties

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Fig. 11. Fracture morphologies with different magnifications of TiAl alloy formed by LMD with preheating at room temperature. (a) 1000×; (b) 2000×

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Table 1. Process parameters of LMD forming TiAl alloy
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Table 1. Process parameters of LMD forming TiAl alloy
Parameter Value
Laser power /W 800
Scanning rate /（mm/s） 10
Powder feeding rate /（g/min） 2.5
Layer thickness /mm 0.5
Scanning interval /mm 1.36
Spot size /mm 3
Substrate Ti-6Al-4V
Argon purity /% 99.999

Table 2. Chemical compositions of the powder and as-built TiAl alloy sample
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Table 2. Chemical compositions of the powder and as-built TiAl alloy sample
Sample Elemental chemical composition（atomic fraction /%）
Ti Al Cr Nb
Powder 48.09 48.02 1.97 1.92
As-built TiAl alloy 48.29 47.80 1.95 1.96

Table 3. Micro-nano CT detection results at different positions of TiAl alloy formed by LMD
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Table 3. Micro-nano CT detection results at different positions of TiAl alloy formed by LMD
Position Number of defects Maximum defect size /μm Densification /%
Bottom-1 1047 63.94 99.9970
Bottom-2 2375 165.54 99.9920
Middle 1461 156.54 99.9960
Top-2 1472 80.19 99.9958
Top-1 1210 171.20 99.9930

Table 4. Comparison of tensile properties of TiAl alloys formed by LMD and other methods
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Table 4. Comparison of tensile properties of TiAl alloys formed by LMD and other methods
Method Tensile strength σ_b /MPa Elongationδ /% Reference
LMD with preheating 497 0.49 Ours
LMD without preheating 408 — ［30］
Casting 466 0.44 ［31］
Forging 557 1.30 ［32］

Table 5. Comparison of high-temperature tensile properties at 750 ℃ between TiAl alloys formed by LMD and other methods
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Table 5. Comparison of high-temperature tensile properties at 750 ℃ between TiAl alloys formed by LMD and other methods
Method Tensile strength σ_b /MPa Elongation δ /% Reference
LMD 613 5.5 Ours
Casting 600 5.6 ［33］
Forging 400 200.0 ［34］

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Feng Zhang, Hangyu Yue, Bingbing Sun, Ruifeng Li, Haisheng Zhao, Youxing Yao, Yibin Pang. Microstructure and Mechanical Properties of TiAl Alloy Prepared by Laser Melting Deposition[J]. Laser & Optoelectronics Progress, 2024, 61(9): 0914010

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Paper Information

Category: Lasers and Laser Optics

Received: Apr. 23, 2023

Accepted: Jul. 12, 2023

Published Online: May. 6, 2024

The Author Email: Bingbing Sun (sunbingbing2005@163.com)

DOI:10.3788/LOP231142

CSTR:32186.14.LOP231142

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Process parameters of LMD forming TiAl alloy

Table 1. Process parameters of LMD forming TiAl alloy

Table 2. Chemical compositions of the powder and as-built TiAl alloy sample

Table 2. Chemical compositions of the powder and as-built TiAl alloy sample

Table 3. Micro-nano CT detection results at different positions of TiAl alloy formed by LMD

Table 3. Micro-nano CT detection results at different positions of TiAl alloy formed by LMD

Table 4. Comparison of tensile properties of TiAl alloys formed by LMD and other methods

Table 4. Comparison of tensile properties of TiAl alloys formed by LMD and other methods

Table 5. Comparison of high-temperature tensile properties at 750 ℃ between TiAl alloys formed by LMD and other methods

Table 5. Comparison of high-temperature tensile properties at 750 ℃ between TiAl alloys formed by LMD and other methods