Studies on high temperature erosion behavior of HVOF-sprayed (Cr₃C₂-NiCr)Si and WC-Co/NiCrAlY composite coatings

IF 4.2 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2024-11-20 DOI:10.1016/j.ijrmhm.2024.106970

Subbarao Medabalimi , Ajit M. Hebbale , Suresh Gudala , Uzwalkiran Rokkala , M.R. Ramesh

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Abstract

The present study investigates the high temperature erosion behavior of HVOF sprayed composite coatings on T11 steel substrates by studying (Cr₃C₂-NiCr)Si and WC-Co/NiCrAlY coatings. Phase composition, cross sectional microstructure, mechanical properties, and erosion resistance were analyzed by XRD, EDS, SEM and three-dimensional optical profilography. The results demonstrate that the WC-Co/NiCrAlY coating has higher erosion resistance and oxidation stability for all temperatures and impact angles tested. Its enhanced performance in high temperature and erosive conditions is attributable to the formation of stable protective oxides such as Al₂O₃ and Cr₂O₃ and intermetallic phases such as Ni₃Al and Cr₃C₂. The NiCrAlY matrix prevents significant decarburization of WC particles, and hence phase stability and oxidation resistance. The (Cr₃C₂-NiCr)Si coating has higher microhardness due to silicide phases, but is more vulnerable to direct impacts and inferior oxidation resistance. The phase transformations for both coatings are favorable at elevated temperatures which enhances erosion resistance. The WC-Co/NiCrAlY coating is smooth and shallower in erosion craters and is perfectly suited for harsh environments demanding high toughness, impact resistance and oxidation stability. For applications in which high hardness is needed in less severe conditions, the (Cr₃C₂-NiCr)Si coating is more suitable.

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HVOF 喷射 (Cr₃C₂-NiCr)Si 和 WC-Co/NiCrAlY 复合涂层的高温侵蚀行为研究

本研究通过对 (Cr₃C₂-NiCr)Si 和 WC-Co/NiCrAlY 涂层的研究，探讨了 T11 钢基材上 HVOF 喷涂复合涂层的高温侵蚀行为。通过 XRD、EDS、SEM 和三维光学轮廓图分析了相组成、横截面微观结构、机械性能和抗侵蚀性。结果表明，在所有测试温度和冲击角度下，WC-Co/NiCrAlY 涂层都具有更高的抗侵蚀性和氧化稳定性。它在高温和侵蚀条件下的性能之所以得到增强，是因为形成了稳定的保护氧化物，如 Al₂O₃ 和 Cr₂O₃ 以及金属间相，如 Ni₃Al 和 Cr₃C₂。NiCrAlY 基体可防止 WC 颗粒明显脱碳，从而实现相稳定性和抗氧化性。(Cr₃C₂-NiCr)Si涂层因硅化相而具有更高的显微硬度，但更容易受到直接冲击，抗氧化性也较差。两种涂层在高温下的相变都很有利，从而增强了抗侵蚀性。WC-Co/NiCrAlY 涂层表面光滑，侵蚀坑较浅，非常适合要求高韧性、抗冲击性和氧化稳定性的恶劣环境。对于在不太苛刻的条件下需要高硬度的应用，(Cr₃C₂-NiCr)Si 涂层更为合适。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.