热处理对HVOF沉积不锈钢WC-10Co4Cr涂层湿磨耗性能的影响

IF 1.6 Q4 MATERIALS SCIENCE, COATINGS & FILMS

Tribology - Materials, Surfaces & Interfaces Pub Date : 2021-07-01 DOI:10.1080/17515831.2021.1938869

Milena Gallego, Stefany Carolina Chávez, J. de la Roche, A. Toro

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引用次数: 9

摘要

摘要:采用350、450、550和650℃的高温对高速氧燃料(HVOF)沉积在AISI 420不锈钢基体上的WC-10Co4Cr涂层进行热处理，研究热处理对涂层耐磨性的影响。测定了涂层的厚度和显微硬度，并用OM、SEM和XRD分析了涂层的微观结构。x射线衍射结果表明，喷涂态涂层中存在W2C相，热处理后涂层中存在WO3和CoWO4相。与喷涂涂层相比，在350°C下处理的涂层没有观察到明显的微观结构退化。另一方面，在温度高于450°C时，涂层在密度、微观结构和表面硬度方面发生了显著变化。350℃处理的涂层耐磨性最好，而550℃处理的涂层由于氧化过程中出现的显微组织缺陷，耐磨性最差。图形抽象

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Effect of heat treatment on the wet abrasion resistance of WC-10Co4Cr coatings deposited onto stainless steel by HVOF

ABSTRACT Heat treatments were carried out at 350, 450, 550 and 650°C on WC-10Co4Cr coatings deposited by High-Velocity Oxy-Fuel (HVOF) onto AISI 420 stainless steel substrate in order to study their influence on the abrasive wear resistance of the coatings. The thickness and microhardness of the coatings were measured while the microstructure was analysed with the aid of OM, SEM and XRD techniques. The X-ray diffraction results revealed the presence of W2C phase in the as-sprayed coatings, and WO3 and CoWO4 phases after the heat treatments. No significant degradation of the microstructure was observed in coatings treated at 350°C compared with the as-sprayed coatings. Coatings treated at temperatures above 450°C, on the other hand, showed significant changes related to density, microstructure and surface hardness. The coatings treated at 350°C showed the best wear resistance, while the coatings treated at 550°C presented the worst performance due to microstructural defects related to oxidation processes. GRAPHICAL ABSTRACT

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来源期刊

Tribology - Materials, Surfaces & Interfaces MATERIALS SCIENCE, COATINGS & FILMS-

CiteScore

2.80

自引率

0.00%

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