Tribological behaviors of arc sprayed NiCrMoAl alloy coating after heat treatments

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外文摘要：© 2022 Elsevier B.V.The influence of heat treatments on tribological behaviors of arc-sprayed NiCrMoAl alloy coating were studied. The NiCrMoAl alloy coating was heat-treated at 300–700 °C for 10 and 30 days. X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS) were used to study the microstructure and chemical composition. Vickers's hardness and ball-on-disk testing are used to evaluate the mechanical properties of the coating at room temperature. The heat treatment at 600 °C for 30 days led to an increase in the hardness of coatings of upto 155% compared to as-sprayed coating, due to formation of MoSi2 and oxides. The solid solution strengthening in the splats was reduced after heat treatment at a high temperature of 700 °C for 10 and 30 days at the expense of MoSi2 formation. Among heat-treated coatings, heat treatment at 600 °C for 10 days led to the lowest wear rate, whereas this was 20% higher than that of the as-sprayed coating. Moreover, the oxide content after the heat treatment at elevated temperature induced the microvoid and enhanced three-body abrasive wear due to the oxides pull-out of the coating. Therefore, a long heat treatment time, 10 and 30 days caused the poor tribological behavior of the NiCrMoAl alloy coating due to three-body abrasive wear.

外文关键词：

Ex-situ hardnessFabricationHeat treatmentNickel alloyThermal spray coatingTribological behavior

作者：

Srichen A.、Moonngam S.、Linjee S.、Banjongprasert C.

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作者单位：

Doctor of Philosophy Program in Nanoscience and Nanotechnology Faculty of Science Chiang Mai University

Department of Physics and Materials Science Faculty of Science Chiang Mai University

出版年：

2022

DOI：

10.1016/j.surfcoat.2022.128325

Surface & Coatings Technology

ISTP

ISSN：0257-8972

年,卷(期)：2022.437

参考文献量43