Effect of Heat Treatment on Microstructure of TiB<sub>2</sub>/Inconel718 Composites Fabricated by Laser Solid Forming

Huajing Zhai; Fenggang Liu; Fencheng Liu; Qifan You; Xiaobin Yu; Xuehao Gao

doi:10.3788/CJL241413

Chinese Journal of Lasers, Volume. 52, Issue 12, 1202102(2025)

Effect of Heat Treatment on Microstructure of TiB₂/Inconel718 Composites Fabricated by Laser Solid Forming

Huajing Zhai¹, Fenggang Liu^1、*, Fencheng Liu¹, Qifan You¹, Xiaobin Yu¹, and Xuehao Gao^2、**

Author Affiliations

¹School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi , China

²Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315000, Zhejiang , China

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Figures & Tables(9)

Fig. 1. Tissue images of sample #1 fabricated by laser solid forming after HHT. (a) 1175 ℃; (b) 1200 ℃; (c) 1225 ℃; (d) 1250 ℃

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Fig. 2. Tissue images of sample #2 fabricated by laser solid forming after HHT. (a) 1175 ℃; (b) 1200 ℃; (c) 1225 ℃; (d) 1250 ℃

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Fig. 3. Tissue images of sample #3 fabricated by laser solid forming after HHT. (a) 1175 ℃; (b) 1200 ℃; (c) 1225 ℃; (d) 1250 ℃

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Fig. 4. SEM images of laser solid formed TiB₂/In718 composites after 1200 ℃ HHT. (a) Sample #1; (b) sample #2; (c)(d) sample #3

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Fig. 5. Tissue morphologies of laser solid formed TiB₂/In718 composites in DA heat treatment state. (a)(d)(g) Sample #1;

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Fig. 6. Tissue morphologies of laser solid formed TiB₂/In718 composites in STA heat treatment state. (a)(d)(g) Sample #1;

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Table 1. Chemical compositions of Inconel718 alloy
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Table 1. Chemical compositions of Inconel718 alloy
Element C Cr Ni Nb Al Ti
Mass fraction /% ≤0.080 17.000‒21.000 50.000‒55.000 4.750‒5.500 0.300‒0.700 0.750‒1.150
Element Mo Mn Si S P Fe
Mass fraction /% 2.800‒3.300 ≤0.350 ≤0.350 ≤0.015 ≤0.015 Bal.

Table 2. Heat treatment regime for laser solid forming of TiB₂/In718 composites
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Table 2. Heat treatment regime for laser solid forming of TiB₂/In718 composites
Heat treatment process Regime
HHT 1175，1200，1225，1250 ℃
DA 720 ℃×8 h（AC）+620 ℃×8 h（AC）
STA 980 ℃×1 h（WC）+ 720 ℃×8 h（AC）+620 ℃×8 h（AC）

Table 3. Elemental analysis of precipitated phases (mass fraction, %)
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Table 3. Elemental analysis of precipitated phases (mass fraction, %)
Element Ni B Cr Fe Mo Ti Al Nb
EDS1 6.49 80.30 4.97 2.60 1.90 1.60 0.090 3.20
EDS2 1.60 74.40 10.80 1.60 5.40 1.20 0.090 4.70
EDS3 11.90 77.60 2.90 2.70 0.15 1.60 0.040 3.10

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Huajing Zhai, Fenggang Liu, Fencheng Liu, Qifan You, Xiaobin Yu, Xuehao Gao. Effect of Heat Treatment on Microstructure of TiB₂/Inconel718 Composites Fabricated by Laser Solid Forming[J]. Chinese Journal of Lasers, 2025, 52(12): 1202102

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