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Adhesion-Related Phenomena of Stellite 6 HVOF Sprayed Coating Deposited on Laser-Textured Substrates.

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Summary

Laser texturing is a viable surface preparation method for thermal spraying on carbon steel, offering comparable or superior adhesion. However, its effectiveness is limited on brittle nitrided steel due to crack propagation issues.

Keywords:
HVOFadhesioncarbon steelgrit blastinglaser texturingnitrided steelthermal spray

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Additive Manufacturing

Background:

  • Surface preparation is critical for effective thermal spray coatings.
  • Traditional methods like grit blasting have limitations.
  • Laser texturing offers a novel approach to surface modification.

Purpose of the Study:

  • To evaluate laser texturing as a surface preparation technique for thermal spraying.
  • To compare laser texturing with conventional methods for Stellite 6 coatings.
  • To investigate the influence of substrate material on coating adhesion.

Main Methods:

  • Laser texturing of low carbon steel and nitrided steel substrates.
  • High Velocity Oxygen Fuel (HVOF) thermal spraying of Stellite 6.
  • Microstructural analysis using SEM, OM, and Raman spectroscopy.
  • Tensile adhesion testing for bond strength evaluation.

Main Results:

  • Laser texturing proved effective for carbon steel, yielding adhesion comparable or superior to grit blasting.
  • On nitrided steel, laser texturing showed reduced adhesion due to the substrate's hardness and brittleness.
  • Coating properties were analyzed, revealing insights into interfacial behavior.

Conclusions:

  • Laser texturing is a feasible and potentially advantageous surface preparation method for thermal spraying on conventional substrates like carbon steel.
  • The brittle nature of nitrided steel presents challenges for laser texturing and subsequent thermal spray coating adhesion.
  • Further research may explore optimized laser parameters or alternative surface treatments for hardened steels.