Characterization and High-Temperature Oxidation Behavior of Cold-Sprayed Ni-20Cr and Ni-50Cr Coatings on Boiler Steels |
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Authors: | Niraj Bala Harpreet Singh and Satya Prakash |
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Affiliation: | (1) Baba Banda Singh Bahadur Engineering College, Fatehgarh Sahib, Punjab, India;(2) School of Mechanical, Materials and Energy Engineering, Indian Institute of Technology Ropar, Rupnagar, India;(3) Metallurgical and Materials Engineering Department, Indian Institute of Technology Roorkee, Uttrakhand, India |
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Abstract: | Microstructure and mechanical properties of cold-spray coatings are usually required in order to explore the potential industrial
application of the latter. This article demonstrates the successful formulation of Ni-20Cr and Ni-50Cr coatings on two boiler
steels, namely, SAE 213-T22 and SA 516 steel by cold-spray process. The microstructure, coating thickness, phase formation,
and microhardness properties of the coatings were evaluated. The coatings were subjected to cyclic heating and cooling cycles
at an elevated temperature of 1173.15 K (900 °C) to ascertain their high-temperature oxidation behavior. Moreover, these cyclic
exposures can give useful information regarding the adhesion of the coatings with the substrate steels. Of all the coatings,
the Ni-50Cr coating on SA 516 steel had a maximum average hardness value of 469 Hv. As observed from the surface field emission–scanning
electron microscopy (FE-SEM) analysis, the coatings were found to have nearly dense microstructure with the sprayed particles
in interlocked positions. It was concluded that the cold-spray process is suitable for spraying the preceding powders onto
the given boiler steels to produce nearly dense and low oxide coatings. The coatings, in general, were found to follow the
parabolic rate of oxidation and were successful in maintaining their surface contact with their respective substrate steels. |
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