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

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2025-02-01 Epub Date: 2024-12-31 DOI:10.1016/j.matchar.2024.114709

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

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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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激光直接能量沉积原位TiB2/TiC/(Ti, Nb)C增强Inconel 718涂层的组织与力学性能

由于其优异的拉伸性能，高冲击韧性，耐腐蚀性和抗蠕变性，Inconel 718涂层已应用于各种应用，如航空叶轮和燃气轮机。但其硬度低，耐磨性差，限制了其更广泛的应用。本研究利用激光定向能沉积（DED）技术原位合成TiB2、TiC和（Ti, Nb）C陶瓷相，提高了Inconel 718涂层的力学性能。研究了不同Ti和B4C含量的5种涂层对相、显微组织、显微硬度、划痕和耐磨性的影响。利用吉布斯自由能(G)、SEM、EDS和EBSD对实验现象进行分析。结果表明，原位合成了TiB2、TiC和（Ti, Nb）C陶瓷相。（Ti, Nb）C相围绕在Laves相和晶界处的TiC相和TiB2相周围，呈环状分布。研究了MC（指TiC和（Ti, Nb）C）晶体结构中Nb原子和Ti原子的形成和位置关系。分析了Ti原子和Nb原子在MC晶体结构中的分布及其对G的影响。通过细晶强化、固溶强化和二相强化，使涂层的力学性能得到显著改善。添加B4C + Ti可使Inconel 718涂层的显微硬度提高62.96%，并得到了粉末含量与显微硬度的拟合函数。抗变形能力提高，韧性降低。划痕的变形由塑性变形转化为剪切变形。涂层的磨损机制由黏着磨损转变为磨粒磨损，最小磨损率为1.70 × 10−4 mm3/Nm。本研究。提出了一种改善Inconel 718涂层力学性能的新方法，并为涂层的制备提供了指导。

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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.