Evaluation of Thermocyclic Oxidation Behavior of HVOF-Sprayed NiCrFeSiB Coatings on Boiler Tube Steels |
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| Authors: | M R Ramesh S Prakash S K Nath Pawan Kumar Sapra N Krishnamurthy |
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| Affiliation: | (1) Reva Institute of Technology and Management, Kattigenahalli, Yelahanka, Bangalore, 560 064, India;(2) Metallurgical and Materials Engineering Department, Indian Institute of Technology Roorkee, Roorkee, 247 667, India;(3) Sri Venkateshwara College of Engineering, Vidyanagar, Chikkajala, Bangalore, 562 157, India |
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| Abstract: | High velocity oxy-fuel (HVOF) spray process has grown into a well-accepted industrial technology for obtaining coatings resistant
to significant surface degradation processes. In the present study, HVOF process was used to deposit Ni-based hardfacing NiCrFeSiB
alloy powder on kinds of boiler tube steels designated as SA210 grade-A1, SA213-T11, and SA213-T22. The microstructures and
several properties of the as-sprayed coatings have been investigated. Thermocyclic oxidation studies were performed in static
air at 900 °C. NiCrFeSiB-coated steels showed slow oxidation kinetics and considerably lower weight gains than that of uncoated
steels. The superior performance of NiCrFeSiB coatings can be attributed to continuous and protective thin oxide scale of
amorphous SiO2 and Cr2O3 formed on the surface of the oxidized coatings. The combined technique of x-ray diffraction, scanning electron microscopy,
energy dispersive x-ray analysis, and electron probe microanalysis are used to characterize reaction products of the oxidized
surfaces. |
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