Evaluation and comparison the effect of heat treatment on mechanical properties of NiCrBSi thermally sprayed coatings
Abstract
Purpose
This study aims to investigate the effect of post heat treatment on mechanical properties of NiCrBSi coatings, which were applied on 316L stainless steel using high-velocity oxygen-fuel (HVOF) and flame spray techniques.
Design/methodology/approach
The properties of coatings were investigated by metallographic characterizations as well as wear, micro-hardness and adhesion tests.
Findings
The micro-hardness results showed that the coatings considerably increased the sub-layer hardness. In addition, regarding the wear test results, it can be seen that heat treatment increased wear resistance of the coatings. These thermal sprayed coatings are usually re-melted by post heat treatment, leading to improvement in tribological properties. The results obtained revealed that re-melting procedure improved the metallurgical bonding in the substrate\coating interface.
Originality/value
Microstructure defects resulting from thermal spraying such as pores and unmelted particles can be eliminated by post heat treatment. This process can considerably improve the corrosion and wear resistances of the thermal sprayed coatings.
Keywords
Acknowledgements
The authors acknowledge the financial support of Imam Khomeini Oil Refining Company.
Citation
Shabanlo, M., Amini Najafabadi, R. and Meysami, A. (2018), "Evaluation and comparison the effect of heat treatment on mechanical properties of NiCrBSi thermally sprayed coatings", Anti-Corrosion Methods and Materials, Vol. 65 No. 1, pp. 34-37. https://doi.org/10.1108/ACMM-02-2017-1756
Publisher
:Emerald Publishing Limited
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