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EFFECT OF LASER POST-TREATMENT ON MICROSTRUCTURAL AND SLIDING WEAR BEHAVIOR OF HVOF-SPRAYED NiCrC AND NiCrSi COATINGS

Author

Listed:
  • THAVARYA NAIK

    (Department of Mechanical Engineering, Government Polytechnic Kampli, Kampli, Bellary 583132, Karnataka, India)

  • MAHANTAYYA MATHAPATI

    (��Department of Mechanical Engineering, KLE College of Engineering & Technology, Chikodi, Belagavi 591201, Karnataka, India)

  • C. DURGA PRASAD

    (��Department of Mechanical Engineering, RV Institute of Technology and Management Bengaluru, J. P. Nagar, Bengaluru 560076, Karnataka, India)

  • H. S. NITHIN

    (�Department of Mechanical Engineering, Malnad College of Engineering, Hassan 573202, Karnataka, India)

  • M. R. RAMESH

    (�Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, NH 66, Srinivasnagar, Surathkal, Mangalore 575025, Karnataka, India)

Abstract

In this study, NiCrC and NiCrSi coatings are deposited on the MDN 310 steel using High-Velocity Oxy-Fuel (HVOF) process. Laser Surface Melting (LSM) post-heat treatment is carried out on as-sprayed coatings using Laser Engineered Net Shaping (LENSTM) with a power of 300W. The characteristics of both coatings in terms of mechanical and metallurgical properties have been investigated. The thicknesses of the as-sprayed NiCrC and NiCrSi coatings are in the range of 170–200μm. Laser-treated NiCrC and NiCrSi coatings exhibit a thickness range of 162–185μm, respectively. The microstructure of laser-treated NiCrC-300W coating clearly shows a dendrite-like structure, whereas the laser-treated NiCrSi coating exhibits hard layer and columnar homogeneity. Microhardness of as-sprayed NiCrC coating is 515±15 HV0.3 and that of NiCrSi coating is 645±25 HV0.3. Microhardness of laser-treated NiCrC coating is 720±30 HV0.3 and that of NiCrSi coating is 890±15 HV0.3. Dry sliding wear tests are conducted at room temperature (RT) and 400∘C with 10-N and 20-N loads. The wear rates at 400∘C temperature of laser-treated NiCrC and NiCrSi coatings produced are slightly below (1−2.2)×10−3mm3/m and (0.8−1.6)×10−3mm3/m, respectively. Laser-treated coatings produced better dry sliding wear behavior compared with as-sprayed coatings owing to dense microstructure. Formation of SiC phase in NiCrSi coating imparts high wear and frictional resistance compared to the NiCrC coating.

Suggested Citation

  • Thavarya Naik & Mahantayya Mathapati & C. Durga Prasad & H. S. Nithin & M. R. Ramesh, 2022. "EFFECT OF LASER POST-TREATMENT ON MICROSTRUCTURAL AND SLIDING WEAR BEHAVIOR OF HVOF-SPRAYED NiCrC AND NiCrSi COATINGS," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 29(01), pages 1-10, January.
    • Handle: RePEc:wsi:srlxxx:v:29:y:2022:i:01:n:s0218625x2250007x
    DOI: 10.1142/S0218625X2250007X
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