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Impact of Surface Roughness on Formation of Micro Cracks and Fatigue Performance

[+] Author Affiliations
Jeries Abou-Hanna, Jose Lozano

Bradley University, Peoria, IL

Wael Abuzaid

University of Illinois Urbana-Champaign, Urbana, IL

Paper No. IMECE2010-37090, pp. 1-7; 7 pages
doi:10.1115/IMECE2010-37090
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 10: Micro and Nano Systems
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4447-2
  • Copyright © 2010 by ASME

abstract

Tungsten-doped diamond-like carbon (DLC) coatings have been magnetron sputtered with chromium and chromium/tungsten carbide dual interlayers onto 410 stainless steel rods. The surface finish (Ra) of the substrate before deposition was 0.10–0.25 μm for a set of rough rods and 0.05 to 0.10 μm for a set of smooth rods. SEM analyses revealed different kinds of flaws in the as-deposited films (virgin coating). Two samples, one from each set, were fatigue tested under uni-axial tension to determine the effect of the substrate surface roughness on the performance of the coating. Surface analysis revealed a different response between films deposited on rough and smooth substrates. Severe failure modes such as spalling and wide cracks developed from initial film flaws in the rough substrate sample. Cracks and film spalling were also observed in the smooth substrate sample but the severity, in terms of crack dimensions and density was considerably lower than the rough substrate sample.

Copyright © 2010 by ASME

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