Microstructure and Mechanical Properties of TiN/Inconel 718 Composites Fabricated by Selective Laser Melting

doi:10.11900/0412.1961.2020.00485

Acta Metall Sin

2021, Vol. 57

Issue (8): 1017-1026 DOI: 10.11900/0412.1961.2020.00485

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Microstructure and Mechanical Properties of TiN/Inconel 718 Composites Fabricated by Selective Laser Melting

WANG Wenquan, WANG Suyu, CHEN Fei, ZHANG Xinge(

), XU Yuxin

Key Laboratory of Automotive Materials of Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130022, China

Cite this article:

WANG Wenquan, WANG Suyu, CHEN Fei, ZHANG Xinge, XU Yuxin. Microstructure and Mechanical Properties of TiN/Inconel 718 Composites Fabricated by Selective Laser Melting. Acta Metall Sin, 2021, 57(8): 1017-1026.

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Abstract

The Inconel 718 alloy has become a remarkable candidate material for aerospace jet engines, turbine blades, and some other elevated temperature components owing to its superior tensile strength, anticorrosion and thermal performance. Moreover, TiN ceramic particles with high hardness and chemical stability have been realized to significantly improve the mechanical properties of the alloy matrix at a low content. Accordingly, in this work, the Inconel 718 (IN718) alloy and TiN/IN718 composite were fabricated by the optimized selective laser melting (SLM) process. Further, the microstructures and mechanical properties of the IN718 alloy and TiN/IN718 composite under heat treatments were investigated, respectively. The results show that the TiN particles were highly combined with the matrix, and a transition layer with 0.3 μm was formed in the SLM-fabricated TiN/IN718 specimens. Additionally, the microhardness and tensile strength were significantly improved compared with IN718 alloy (39 HV_0.2, 74 MPa, respectively). After the double aging and solution aging (SA) treatments, the number of crack initiation sources was increased owing to the precipitation of the δ phase, which deteriorated the tensile strength of the TiN/IN718 composite. After the homogenization + SA (HSA) treatment, the composite was completely recrystallized, and an appropriate amount of needle- and plate-like δ phases precipitated at the grain boundaries. Hence, the TiN/IN718 composite after the HSA treatment exhibited optimally comprehensive mechanical properties.

Key words: selective laser melting Inconel 718 TiN particle composite heat treatment

Received: 02 December 2020

ZTFLH:

TG249

Fund: Project of Jilin Province Science and Technology Development Plan(20200401034GX);Project of Jilin Province Development and Reform Commission Industrial Technology Research and Development Special(2020C029-1);Fundamental Research Funds for the Central Universities, Jilin University(45120031B004)

About author: ZHANG Xinge, professor, Tel: 18843158576, E-mail: zhangxinge@jlu.edu.cn

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	Wenquan WANG
	Suyu WANG
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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00485 OR https://www.ams.org.cn/EN/Y2021/V57/I8/1017

Fig.1 Schematic of selective laser melting (SLM) scanning strategy (The red and blue parallel arrows represent the laser scanning path of the Nth and (N + 1)th layers, respectively)

Fig.2 SEM images of IN718 alloy powders (a) and TiN particles (b)

Fig.3 OM images of SLMed IN718 alloy (a) and TiN/IN718 composite (b)

Fig.4 EBSD grain orientation distribution maps of SLMed IN718 alloy (a) and TiN/IN718 composite (b)

Fig.5 OM images of SLMed (a), SLMed-DA (b), SLMed-SA (c), and SLMed-HSA (d) TiN/IN718 composites (DA—double aging, SA—solution-double aging, HSA—homogenization-solution-double aging)

Fig.6 SEM images of SLMed (a), SLMed-DA (b), SLMed-SA (c), and SLMed-HSA (d) TiN/IN718 composites

Fig.7 SEM images of SLMed TiN/IN718 cpmposites (a, b), and EDS line scan analyses along line a in Fig.7a (c) and line b in Fig.7b (d)

Fig.8 SEM images of SLMed-SA TiN/IN718 composite (a, c), and EDS line scan analysis in Fig.8a (b) and point scan analysis in Fig.8c (d)

Fig.9 XRD spectra for SLMed IN718 and TiN/IN718 composites with different heat treatments

Fig.10 Microhardnesses of SLMed IN718 and TiN/IN718 composites under different heat treatments

Fig.11 Wear track profiles of SLMed IN718 and TiN/IN718 composites under different heat treatments

Table 1 Wear test results of SLMed IN718 and TiN/IN718 composites under different heat treatments

Fig.12 Tensile strength and elongation of SLMed IN718 and TiN/IN718 composites (a), and the stress-strain curves of SLMed TiN/IN718 composites (b) under different heat treatments

Fig.13 Fracture morphologies of SLMed IN718 (a), and SLMed (b) as well as SLMed-HSA (c) TiN/IN718 composites

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