Kumar, M. Singh, H. Singh, N. Hong, Sung-Min Choi, In-Suk Suh, Jin-Yoo Chavan, N. M. Kumar, S. Joshi, S. V. 2024-01-20T07:31:52Z 2024-01-20T07:31:52Z 2021-09-05 2015-03-25 0257-8972 https://pubs.kist.re.kr/handle/201004/125643 In the current investigation a pre-synthesized nano-crystalline Ni-20Cr powder was deposited by cold-spray technique on SA 516 steel. The powder was synthesized by ball milling approach. The nano-crystallinity of the developed coating was established by crystallite size measurements from XRD profile, which was further endorsed by TEM analysis. High-temperature oxidation behavior of uncoated and coated samples was studied under cyclic isothermal conditions at 900 degrees C for 50 cycles in a laboratory tube furnace. The oxidation rates for the bare and coated steel were evaluated in terms of weight gain data. Different characterization techniques, such as X-ray diffraction (XRD), scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), and transmission electron microscopy (TEM) analyses were utilized to characterize the oxide scale. The hardness and oxidation resistance of the steel increased after the application of coating. The reduction in oxidation rate of the base steel was 94%. Moreover, the developed nanostructured coating was observed to reduce weight gain by 64% in comparison with micron-sized Ni-20Cr cold spray coating thus offers a higher oxidation resistance. This may be attributed to relatively denser structure, lower porosity and lower oxide content of the nanostructured coating. (C) 2015 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA NANOSTRUCTURED MATERIALS NANOCRYSTALLINE Development of nano-crystalline cold sprayed Ni-20Cr coatings for high temperature oxidation resistance Article 10.1016/j.surfcoat.2015.02.032 1 SURFACE & COATINGS TECHNOLOGY, v.266, pp.122 - 133 SURFACE & COATINGS TECHNOLOGY 266 122 133 scie scopus 000352664600017 2-s2.0-84925265913 Materials Science, Coatings & Films Physics, Applied Materials Science Physics Article NANOSTRUCTURED MATERIALS NANOCRYSTALLINE High-temperature oxidation Oxide scale Cold-spray Boiler steel Thermal spraying