Effect of Ti content on microstructure evolution and properties of Ni50A-B4C coatings

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-09-01 DOI:10.1016/j.ceramint.2025.06.245

Zhen-wei Li , Tao Lin , Liang Li , Cai-nian Jing , Ying-ming Tu , Na-na Liu , Xuan Yang

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Abstract

Ni50A-B₄C-Ti coatings with varying Ti contents (0–6 wt.%) were fabricated on H13 steel via laser cladding technology, and the effects of Ti content on the phase composition, microstructure, properties of the coatings, and microstructure evolution were systematically investigated. Results indicate that the introduction of Ti promotes the formation of TiC and TiB₂ phases and increases the lattice constant of the FeNi phase (from 0.17855 nm to 0.17975 nm), attributed to the solid solution strengthening effect caused by the larger atomic radius of Ti (132 p.m.). Microstructural analysis reveals that the addition of 1 wt% Ti generates submicron TiC particles (0.17–0.2 μm) pinned within lamellar precipitates, significantly enhancing the hardness (659.83 HV_0.5) and wear resistance (wear loss of 1 mg). However, when Ti content increases to 6 wt%, TiC/TiB₂ eutectic structures form through a preferential precipitation mechanism, while the exothermic nature of in situ reactions induces microstructural coarsening, leading to a hardness reduction (415.83 HV_0.5). Electrochemical tests demonstrate that the 6 wt% Ti coating exhibits optimal corrosion resistance, characterized by the lowest corrosion current density (I_corr), which is attributed to the high compactness and self-healing capability of the TiO₂-Cr₂O₃ composite passive film. The study demonstrates that moderate Ti addition (1 wt%) optimizes mechanical performance, whereas higher Ti content (6 wt%) significantly improves corrosion resistance, providing a theoretical foundation for the composition design and performance regulation of laser-clad coatings.

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Ti含量对Ni50A-B4C涂层组织演变及性能的影响

采用激光熔覆技术在H13钢表面制备了不同Ti含量（0 ~ 6 wt.%）的Ni50A-B4C-Ti涂层，系统研究了Ti含量对涂层相组成、显微组织、性能和显微组织演变的影响。结果表明，Ti的引入促进了TiC相和TiB2相的形成，使FeNi相的晶格常数（从0.17855 nm增加到0.17975 nm）增加，这是由于较大的Ti原子半径（132 μ m）引起的固溶体强化效应所致。显微组织分析表明，添加1 wt% Ti后，在层状析出物中产生了亚微米TiC颗粒（0.17-0.2 μm），显著提高了硬度（659.83 HV0.5）和耐磨性（磨损损失为1 mg）。然而，当Ti含量增加到6 wt%时，通过优先析出机制形成TiC/TiB2共晶结构，而原位反应的放热性质导致微观组织粗化，导致硬度降低（415.83 HV0.5）。电化学测试表明，6 wt% Ti涂层具有最佳的耐蚀性，其腐蚀电流密度（Icorr）最低，这归功于TiO2-Cr2O3复合钝化膜的高致密性和自修复能力。研究表明，适量添加Ti （1 wt%）可优化涂层的力学性能，而添加较高的Ti （6 wt%）可显著提高涂层的耐蚀性，为激光熔覆涂层的成分设计和性能调控提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.