Microstructural evolution and cyclic oxidation behavior of HVOF-sprayed NiCrSi and NiCrC coatings on T11 steel

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-10-26 DOI:10.1016/j.matchar.2024.114495

Subbarao Medabalimi , Ajit M. Hebbale , Richa Singh , Vijay Desai , M.R. Ramesh

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引用次数: 0

Abstract

This study analyzes NiCrSi and NiCrC coatings developed on low alloy ferritic stainless steel (grade T11) through the HVOF spraying technique. The coatings were characterized by their phase constitution, microstructure, cyclic oxidation behavior, and hardness. X-ray diffraction (XRD) analysis confirmed the presence of the NiCr solid solution matrix as the primary phase in both coatings. Moreover, the microstructure of the NiCrSi coating included the hard intermetallic compounds like Cr₃Si and Ni₃Si and the NiCrC coating contained the hard phases like Cr₃C₂ and Ni₃C which improved the hardness and the wear resistance of the coatings. Microhardness measurements revealed that the coatings had an average hardness of 300 ± 50 HV, significantly greater than the substrate hardness of 225 ± 25 HV. Cyclic oxidation tests were carried out at 700 °C revealed that both the coatings showed a lower weight gain than the uncoated substrate, suggesting enhanced oxidation resistance. This was because the protective oxide layers like Cr₂O₃ and SiO₂ in the NiCrSi coating and Cr₂O₃ and NiO in the NiCrC coating were formed. X-ray analysis establish ed. the presence of these oxides, which inhibited oxygen penetration through the coatings and provided additional protection against oxidation. Therefore, the study revealed that both NiCrSi and NiCrC coatings have good mechanical and oxidation resistance properties, which make them suitable for high-temperature applications where there is a need for improved durability, wear resistance, and protection against oxidation.

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T11 钢上 HVOF 喷涂的 NiCrSi 和 NiCrC 涂层的微观结构演变和循环氧化行为

本研究分析了通过 HVOF 喷涂技术在低合金铁素体不锈钢（T11 级）上形成的 NiCrSi 和 NiCrC 涂层。涂层的特征包括相组成、微观结构、循环氧化行为和硬度。X 射线衍射（XRD）分析证实，两种涂层的主相都是镍铬固溶体基体。此外，NiCrSi 涂层的微观结构中含有铬₃Si 和镍₃Si 等硬金属间化合物，而 NiCrC 涂层则含有铬₃C₂和镍₃C 等硬相位，从而提高了涂层的硬度和耐磨性。显微硬度测量显示，涂层的平均硬度为 300 ± 50 HV，明显高于基体硬度 225 ± 25 HV。在 700 °C 下进行的循环氧化测试表明，两种涂层的增重都低于未涂层的基底，这表明涂层的抗氧化性得到了增强。这是因为在 NiCrSi 涂层中形成了 Cr₂O₃ 和 SiO₂ 等保护性氧化层，在 NiCrC 涂层中形成了 Cr₂O₃ 和 NiO。X 射线分析证实了这些氧化物的存在，它们抑制了氧气穿透涂层，并提供了额外的抗氧化保护。因此，研究表明 NiCrSi 和 NiCrC 涂层都具有良好的机械性能和抗氧化性能，适合于需要提高耐久性、耐磨性和抗氧化保护的高温应用。

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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.