Effect of WC content on hardness and fracture toughness of WC-Ni60A wear-resistant coatings

IF 5.3 2区 材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS
Min Wei , Jing Li , Kun Xie , Yang-yi Xiao , Qiang Wan , Zhen-ting Yang , Yong-jun Huang , Mohamed Refai
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Abstract

WC-Ni60A is widely used in surface wear-resistant parts, its toughness has a significant effect on its performance, but the related research is less. The plasma cladding method was used to successfully cover 45# steel substrates with three different types of WC-Ni60A coatings that are highly resistant to wear. The coatings had different amounts of WC. Field emission scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffractometry (XRD) were used to analyze the wear-resistant coatings' microstructure, elemental distribution, and phase composition. A micro-Vickers hardness tester and a nanoindentation tester were used to measure the coatings' microhardness and nanohardness. They were also tested for their ability to resist plastic deformation and recover from elastic deformation. Finally, the fracture toughness of the coating was studied utilizing a three-point bending test combined with numerical simulation to demonstrate the crack extension process. The metallurgical bonding of the three prepared coatings with the substrate is excellent. The hardness of the coatings increased as the WC content grew, reaching a maximum microhardness of 1038.75 HV. However, the fracture toughness reduced as the WC content increased, and the fracture modes were also transformed. The fracture toughness values for the 15 %, 25 %, and 35 % WC-Ni60A coatings were measured as 35.57, 34.54, and 31.395 MPam, respectively. The crack toughness values that the finite element model predicted for the 15 % and 25 % WC-Ni60A coatings were 34.86 and 32.56 MPam, which were 2 % and 5.8 % lower than the experimental data.

WC 含量对 WC-Ni60A 耐磨涂层硬度和断裂韧性的影响
WC-Ni60A 广泛应用于表面耐磨零件,其韧性对零件性能有重要影响,但相关研究较少。本研究采用等离子熔覆方法,成功地在 45# 钢基体上覆盖了三种不同类型的 WC-Ni60A 涂层,这些涂层具有很强的耐磨性。涂层中的 WC 含量各不相同。利用场发射扫描电子显微镜(SEM)、能量色散光谱(EDS)和 X 射线衍射仪(XRD)分析了耐磨涂层的微观结构、元素分布和相组成。使用显微维氏硬度计和纳米压痕测试仪测量涂层的显微硬度和纳米硬度。此外,还测试了涂层的抗塑性变形和弹性变形恢复能力。最后,利用三点弯曲试验研究了涂层的断裂韧性,并结合数值模拟演示了裂纹扩展过程。制备的三种涂层与基体的冶金结合非常好。涂层的硬度随着 WC 含量的增加而提高,达到了 1038.75 HV 的最大显微硬度。然而,断裂韧性随着 WC 含量的增加而降低,断裂模式也发生了变化。15 %、25 % 和 35 % WC-Ni60A 涂层的断裂韧性值分别为 35.57、34.54 和 31.395 MPam。有限元模型预测的 15% 和 25% WC-Ni60A 涂层的裂纹韧性值分别为 34.86 和 32.56 MPam,比实验数据分别低 2% 和 5.8%。
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来源期刊
Surface & Coatings Technology
Surface & Coatings Technology 工程技术-材料科学:膜
CiteScore
10.00
自引率
11.10%
发文量
921
审稿时长
19 days
期刊介绍: Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.
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