Investigation of Residual Stresses in Flame Sprayed Ni-Based Wear Resistant Coatings by the Hole-Drilling and X-Ray Methods

Abstract:

The present investigation was carried out in order to determine residual stresses inNi-based self-fluxing alloy based high velocity oxy-fuel (HVOF) coatings with different wearresistant additives. The main components of the alloy were Ni, Cr, Si and B. To increase the wearresistance of self-fluxing NiCrSiB alloy based coatings, different ceramics and hard metals(WC-Co, TiC-NiMo and Cr2C3-Ni) were added. Residual stresses were measured by the holedrillingmethod and the X-ray method. The incremental hole-drilling technique combined with theintegral method was applied. This combined method allows to analyse non-uniform throughthicknessresidual stresses. The results obtained with the incremental hole-drilling method indicatethat through-thickness residual stress distribution is non-uniform. The determined residual stresseswere tensile on the surface of the coating and became compressive toward the interface.The values of the modulus of elasticity and microhardness of the coatings were obtained byinstrumented indentation. The microstructures of the studied coatings were investigated with theSEM technique.

• Periodical: Materials Science Forum (Volumes 768-769)
• Pages: 144-149
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.768-769.144
• Online since: September 2013
• Authors: Alexander Ryabchikov, Harri Lille, Renno Reitsnik, Stanislav Toropov, Andrei Surzhenkov, Priit Kulu
• Keywords: Hole-Drilling Method, HVOF Coating, Microstructure, Residual Stress, X-Ray Technique

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