Single Asperity Scratch Behaviour of Cast Stellite 6 Alloy

  • M. A. Ashraf
  • M. El-Ameen
  • R. AhmedEmail author
  • N. H. Faisal
  • A. M. El-Sherik
  • M. F. A. Goosen
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 154)


The aim of this paper is to investigate the nano-scale sliding wear behaviour of cast Stellite 6 (Co-28Cr-4.5W-1C) with a view to comprehend single asperity deformation. A nanoindentation system (NanoTest\(^{\mathrm{TM}}\)—Micro Materials Limited, UK) equipped with wear testing module was used to simulate single asperity deformation behaviour using a sphero-conical indenter of 10 \(\upmu \)m tip radius, 60\(^{\circ }\) included angle for a sliding distance of 60 \(\upmu \)m under 50 and 100 mN load, with sliding velocity of 2 \(\upmu \)m/s. The test load was increased linearly over the sliding distance. Post-test evaluations included X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements to determine the failure mode and wear volume. An elastic-plastic finite element model (FEM) was used to compare the displaced volume of alloy with the experimental data. There is limited work available to understand the nanotribological properties of Stellite alloys in published literature. In the current investigation results are discussed in terms of microstructural and tribo-mechanical evaluations to provide an understanding of the structure-property relationships. Results indicate that the wear behaviour at the nano-scale was dominated by the interaction of interdentritic carbides and metal matrix. It can be concluded that nano-scale sliding wear behaviour of cast Stellite 6 alloy is controlled by single asperity deformation. The predictions of nano-scale elastic-plastic FEM to calculate the volume displaced by the scratch are also discussed.


Nanohardness Cast Stellite 6 alloy Sliding wear Nanoindentation Nanoscratch Cobalt based alloys 



The work presented in this paper has been supported by the project titled “Wear behavior characterization of Stellite Alloys using computational modeling”, funded by Saudi Aramco (Contract number 6600028941).


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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • M. A. Ashraf
    • 1
  • M. El-Ameen
    • 1
  • R. Ahmed
    • 1
    • 2
    Email author
  • N. H. Faisal
    • 1
    • 3
  • A. M. El-Sherik
    • 4
  • M. F. A. Goosen
    • 5
  1. 1.College of EngineeringAlfaisal UniversityRiyadhSaudi Arabia
  2. 2.School of Engineering and Physical SciencesHeriot-Watt UniversityEdinburghUK
  3. 3.School of EngineeringRobert Gordon UniversityAberdeenUK
  4. 4.Research and Development CentreSaudi AramcoDhahranSaudi Arabia
  5. 5.Office of Research and Graduate StudiesAlfaisal UniversityRiyadhSaudi Arabia

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