Microstructure and mechanical properties of in-situ TiB2/TiC/(Ti, Nb)C reinforced Inconel 718 coating by laser direct energy deposition

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2025-02-01 DOI:10.1016/j.matchar.2024.114709

Chuang Guan , Ying Chen , Fanwei Meng , Liaoyuan Chen , Zhelun Ma , Tianbiao Yu

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引用次数: 0

Abstract

Inconel 718 coating has been applied in various applications such as aviation impellers and gas turbines due to its excellent tensile properties, high impact toughness, corrosion resistance, and creep resistance. However, its low hardness and poor wear resistance restrict its broader applications. In this study, laser directed energy deposition (DED) is utilized to in-situ synthesize TiB₂, TiC, and (Ti, Nb)C ceramic phases, which improves the mechanical properties of the Inconel 718 coating. The effect of five coatings with different Ti and B₄C contents on phase, microstructure, microhardness, scratch, and wear resistance was studied. Gibbs free energy (G), SEM, EDS, and EBSD were used to analyze experimental phenomena. The results showed that TiB₂, TiC, and (Ti, Nb)C ceramic phases were in-situ synthesized. The (Ti, Nb)C phase with a loop shape was around TiC phase and TiB₂ phase, which were found on the Laves phase and at grain boundaries. The formation and positional relationship of the Nb atom and Ti atom in MC (refer to TiC and (Ti, Nb)C) crystal structure have been investigated. The distribution of Ti atom and Nb atom within the MC crystal structure, as well as their effect on G, have also been analyzed. The mechanical properties of Inconel 718 coating have been significantly improved as a result of fine-grain strengthening, solid solution strengthening, and second-phase strengthening. The addition of B₄C + Ti content can considerably enhance the microhardness of Inconel 718 coatings by 62.96 %, and the fitting function of powder content and microhardness has been obtained. The deformation resistance is increased, and the toughness is reduced. The deformation of the scratch has been translated from plastic deformation to shear deformation. In addition, the wear mechanism of the coating changed from adhesive wear to abrasive wear, and the minimum wear rate is 1.70 × 10⁻⁴ mm³/Nm. This study.

proposes a novel approach for improving the mechanical properties of Inconel 718 coating, as well as provides guidelines for coating preparation.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.