Post-Heat Microstructural Treatment Changes in Nickel Based Hvof Coating

M. A. Rodríguez Mrs Rodriguez is in the School of Mechanical Engineering, Central University of Venezuela, Apartado48200, Caracas, 1041 ± A Venezuela. Dr Gil is at the National Polytechnic University of Puerto Ordaz, Estado Boloavar, Venezuela and Professor Staia ([email protected]) may be contacted at Apartado 49149, Caracas 1042 ± A, Venezuela.

L. Gil Mrs Rodriguez is in the School of Mechanical Engineering, Central University of Venezuela, Apartado48200, Caracas, 1041 ± A Venezuela. Dr Gil is at the National Polytechnic University of Puerto Ordaz, Estado Boloavar, Venezuela and Professor Staia ([email protected]) may be contacted at Apartado 49149, Caracas 1042 ± A, Venezuela.

M. H. Staia Mrs Rodriguez is in the School of Mechanical Engineering, Central University of Venezuela, Apartado48200, Caracas, 1041 ± A Venezuela. Dr Gil is at the National Polytechnic University of Puerto Ordaz, Estado Boloavar, Venezuela and Professor Staia ([email protected]) may be contacted at Apartado 49149, Caracas 1042 ± A, Venezuela.

Abstract

The effects of various heat treatments (oxyacetylene flame, argon atmosphere, vacuum) on the microstructure and hardness of thermal sprayed coatings has been studied. Commercial powder of the NiCrSiBW alloy known as Colmonoy 88 was sprayed using the HVOF (high velocity oxyfuel) process. Coatings were deposited on AISI 1020 steel substrates using a JP5000 gun. The processing parameters recommended by the powder manufacturer were employed. The results indicate that post-heat treatments conducted in both vacuum and argon atmosphere produced significant changes in the morphology and distribution of the hard phases, but no noticeable changes were observed when the coatings were post-heat treated with an oxyacetylene flame. The measured microhardness values were correlated with the microstructural changes which took place during post-heat treatment. SE/S234

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Post-Heat Microstructural Treatment Changes in Nickel Based Hvof Coating

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Post-Heat Microstructural Treatment Changes in Nickel Based Hvof Coating

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