Effects of heat treatment on microstructure and properties of Fe-based amorphous composite coatings

Abstract

It is found that heat treatment can improve the microstructure and properties of the coating. In this paper, the Fe-Cr-Mo-B-C amorphous composite coatings fabricated by laser cladding technology were heat treated at different temperatures. The effects of heat treatment temperature on the crystallisation, porosity, microhardness, and corrosion resistance of coatings were investigated. The experimental results show that the amorphous content and porosity after heat treatment, the comprehensive properties are improved, and the coating defects are solved. Both the amorphous content and the porosity affect the corrosion resistance of the coatings. The smaller the porosity, the higher the amorphous content, and the stronger the corrosion resistance of the coating. When the difference in amorphous content is small, the porosity of the coating becomes the dominant factor affecting the corrosion resistance of the coating. The experimental results shows that the best optimum heat treatment temperature for the coatings is 200°C.

KEYWORDS:

• Fe-based amorphous composite coating
• heat treatment
• amorphous content
• porosity
• corrosion resistance

Disclosure statement

No potential conflict of interest was reported by the authors.

Data availability statement

Original measurement data can be provided on request.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (grant number 51861021, No. 52261032, No. 51661016, No. 51971103), Science and Technology Plan of Gansu Province(grant number 21YF5GA074, 20YF8GA052), Public Welfare Project of Zhejiang Natural Science Foundation (grant number LGG22E010008), and Key Research Program of Education Department of Gansu Province (grant number GSSYLXM-03).