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SOLID PARTICLE EROSION RESISTANCE OF HVAF-SPRAYED WC-10Co-4Cr COATING ON CA6NM STEEL

Author

Listed:
  • ANURAG HAMILTON

    (Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology Jaipur, Jaipur 302017, India)

  • ASHOK SHARMA

    (Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology Jaipur, Jaipur 302017, India)

  • UPENDER PANDEL

    (Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology Jaipur, Jaipur 302017, India)

Abstract

In the present investigation, WC-10Co-4Cr coating was deposited by high velocity air-fuel (HVAF) process on CA6NM hydro turbine steel. A detailed microstructural and phase compositional study was carried out on the coating. Mechanical properties of the coating were also evaluated. WC-10Co-4Cr coating showed a homogeneous, well-bonded structure with low porosity, which is mainly attributed to less decarburization of WC. Erosion resistance of the coating was evaluated by air jet erosion tester at three different impingement angles (30∘, 60∘ and 90∘) for 35 and 70m/s impact velocities. The FESEM micrographs were taken, before and after erosion tests, to determine the erosion mechanism. The test results revealed that the coating protects the substrate at 30∘, 60∘ and 90∘ impingement angles. At 70m/s impact velocity, uncoated and coated steel showed higher cumulative volume loss than in the case of 35m/s impact velocity. It was observed that uncoated steel showed a ductile behavior during erosion and WC-10Co-4Cr coating showed mixed (ductile and brittle) mode of fracture during erosion.

Suggested Citation

  • Anurag Hamilton & Ashok Sharma & Upender Pandel, 2017. "SOLID PARTICLE EROSION RESISTANCE OF HVAF-SPRAYED WC-10Co-4Cr COATING ON CA6NM STEEL," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 24(Supp01), pages 1-14, November.
    • Handle: RePEc:wsi:srlxxx:v:24:y:2017:i:supp01:n:s0218625x18500117
    DOI: 10.1142/S0218625X18500117
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