Effects of Nano‐TiC Content on Microstructures and Mechanical Properties of TiC/Inconel 718 Composites Prepared by Laser Powder Bed Melting

Zhen Wang; Pengfei Guo; Qi Yang; Changshuai Zhai; Jianfeng Geng; Huijun Wang; Zuo Li; Jun Yu; Xin Lin

doi:10.3788/CJL241374

Chinese Journal of Lasers, Volume. 52, Issue 12, 1202308(2025)

Effects of Nano‐TiC Content on Microstructures and Mechanical Properties of TiC/Inconel 718 Composites Prepared by Laser Powder Bed Melting

Zhen Wang¹, Pengfei Guo^1、*, Qi Yang¹, Changshuai Zhai¹, Jianfeng Geng¹, Huijun Wang¹, Zuo Li^2、**, Jun Yu², and Xin Lin²

Author Affiliations

¹Shandong Engineering Research Center for Additive Manufacturing, Qingdao University of Technology, Qingdao 266520, Shandong , China

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

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Figures & Tables(14)

$Powder morphologies with different TiC mass fractions. (a)(b) 0; (c)(d) 1.5%; (e)(f) 3.0%$

Fig. 1. Powder morphologies with different TiC mass fractions. (a)(b) 0; (c)(d) 1.5%; (e)(f) 3.0%

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Fig. 2. LPBF forming process. (a) Scanning strategy; (b) tensile specimen size; (c) schematic diagram of tensile sample processing

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Fig. 3. Molten pool and microstructure morphologies

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Fig. 4. Dendrite morphologies. (a) LPBF-Inconel 718; (b) LPBF-1.5%TiC/Inconel 718; (c) LPBF-3.0%TiC/Inconel 718

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Fig. 5. Equivalent grain size diagrams. (a) LPBF-Inconel 718; (b) LPBF-1.5%TiC/Inconel 718; (c) LPBF-3.0%TiC/Inconel 718

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Fig. 6. EBSD test results. (a) Inverse pole figure of LPBF-Inconel 718; (b) inverse pole figure of LPBF-1.5%TiC/Inconel 718; (c) inverse pole figure of LPBF-3.0%TiC/Inconel 718; (d) pole figure

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Fig. 7. Comparison of hardness

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Fig. 8. Tensile properties. (a) Stress-strain curves; (b) ultimate tensile strength, yield strength,and elongation

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Fig. 9. Comparison of properties. (a) Comparison of tensile properties of Inconel 718 alloys ; (b) comparison of tensile properties of Inconel 718 composites; (c) comparison of hardnesses of Inconel 718 alloys and composites

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Fig. 10. Fracture morphologies of tensile specimens. (a)(b) LPBF-Inconel 718; (c)(d) LPBF-1.5%TiC/Inconel 718; (e)(f) LPBF-3.0%TiC/Inconel 718

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$Microstructures near fractures of tensile specimens. (a)(b) LPBF-Inconel 718; (c)(d) LPBF-1.5%TiC/Inconel 718; (e)(f) LPBF-3.0%TiC/Inconel 718$

Fig. 11. Microstructures near fractures of tensile specimens. (a)(b) LPBF-Inconel 718; (c)(d) LPBF-1.5%TiC/Inconel 718; (e)(f) LPBF-3.0%TiC/Inconel 718

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Table 1. Chemical compositions of Inconel 718 alloy powder
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Table 1. Chemical compositions of Inconel 718 alloy powder
Composition Ni Cr Al Ti Mn C Nb Mo Fe
Mass fraction /% 52.7700 18.5600 0.5500 0.8400 0.0620 0.0145 5.1200 3.0200 Bal.

Table 2. Optimal processing parameters and density values under different TiC mass fractions
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Table 2. Optimal processing parameters and density values under different TiC mass fractions
Laser power /W
Scanning speed /
（mm/min）
Hatch distance /μm Layer thickness /μm
Relative
density /%
TiC mass
fraction /%
900 80 20 99.7 0
135 800 99.5 1.5
700 99.2 3.0

Table 3. Average Vickers hardness
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Table 3. Average Vickers hardness
Sample LPBF-Inconel 718 LPBF-1.5%TiC/Inconel 718 LPBF-3.0%TiC/Inconel 718
Average
Hardness /HV
281.4±4.83 332.2±8.27 335.1±5.95

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Zhen Wang, Pengfei Guo, Qi Yang, Changshuai Zhai, Jianfeng Geng, Huijun Wang, Zuo Li, Jun Yu, Xin Lin. Effects of Nano‐TiC Content on Microstructures and Mechanical Properties of TiC/Inconel 718 Composites Prepared by Laser Powder Bed Melting[J]. Chinese Journal of Lasers, 2025, 52(12): 1202308

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