Estimation of indenter depth during frictional treatment of nickel-based coatings using optical profilometry

ABSTRACT

The paper determines the effect of frictional treatment of nickel-based coatings of different initial hardness on the degree of their hardening and the depth of the indenter's impact on the surface layer. Frictional treatment was carried out with hemispherical sliding indenters made of finely dispersed cubic boron nitride under a load of 150 N for coating A (wt.%: Cr – 14.8, B – 2.1, Si – 2.9, C – 0.48, Fe – 2.6, Ni – base) and 500 N for coating B (wt.%: Cr – 18.2, B – 3.3, Si – 4.2, C – 0.92, Fe – 2.6, Ni – base). Using instrumental microindentation and optical profilometry, it was shown that the deformation of the softer and more ductile coating A proceeds more significantly: its hardening during frictional treatment reaches 56%, and the indenter impact depth is up to 3.8 μm, while the corresponding indicators for the harder coating B are 8% and 1.5 μm. The depth of the indenter impact must be considered if frictional treatment is used as a finishing operation for parts with nickel coatings.

KEYWORDS:

• Nickel-based coatings
• NiCrBSi
• laser cladding
• frictional treatment
• microhardness
• optical profilometry

Acknowledgements

The work was carried out within the State assignment to the Institute of Engineering Science, UB RAS and the Institute of Metal Physics, UB RAS.The experiments were carried out using the equipment of the Collective Center ‘Plastometria’ of the IES UB RAS.

Disclosure statement

No potential conflict of interest was reported by the author(s).