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

Thavarya Naik, Mahantayya Mathapati, C. Durga Prasad, H. S. Nithin and M. R. Ramesh
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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

Surface Review and Letters (SRL), 2022, vol. 29, issue 01, 1-10

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.

Keywords: Nickel–chromium; HVOF; Laser Surface Melting; sliding wear (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218625X2250007X

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