Surface property modifications of silicon carbide ceramic following laser shock peening

Pratik Shukla, Subhasisa Nath, Guanjun Wang, Xiaojun Shen, Jonathan Lawrence

Research output: Contribution to journalArticle

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23 Downloads (Pure)

Abstract

This paper is focused on Laser shock peening (LSP) of silicon carbide (SiC) advanced ceramic. A comprehensive study was undertaken using a pulsed Nd:YAG laser. Surface modifications were investigated, particularly: the roughness, hardness, fracture toughness, microstructure, phase transformation and residual stress induced before and after the LSP surface treatment. The findings showed increase in the surface roughness, changes to the surface morphology, improved hardness, and a reduction in the fracture lengths. The LSP surface treatment also improved the surface fracture toughness from an average of 2.32 MPa m1/2 to an average of 3.29 MPa m1/2. This was attributed to the surface integrity and the induced compressive residual stress as a maximum of −92 MPa was measured compared to an average of +101 MPa on the as-received SiC. A slight change in the surface chemistry was also observed from the XPS spectra, however, no real phase transformation was seen from the X-ray diffraction analysis. Laser energy density of around 1.057 J/cm2, 8.5 mm spot size, 10 Hz pulse repetition rate (PRR) at 6ns pulse duration, and 1064 nm wavelength resulted to obtaining a crack-free surface treatment and demonstrated that the technique is also beneficial to enhance some of the properties to strengthen brittle ceramics such as SiC
Original languageEnglish
Pages (from-to)3027-3038
Number of pages12
JournalJournal of the European Ceramic Society
Volume37
Issue number9
Early online date27 Mar 2017
DOIs
Publication statusPublished - Aug 2017

Fingerprint

Shot peening
Silicon carbide
Surface properties
Surface treatment
Lasers
Fracture toughness
Residual stresses
Surface roughness
Phase transitions
Hardness
Pulse repetition rate
Surface chemistry
Compressive stress
X ray diffraction analysis
Surface morphology
Laser pulses
X ray photoelectron spectroscopy
silicon carbide
Cracks
Wavelength

Keywords

  • Laser shock peening
  • LSP
  • SiC
  • Ceramics
  • Hardness
  • K1c
  • Residual stress
  • Microstructure
  • Surface finish
  • Composition and phase transformation

Cite this

Surface property modifications of silicon carbide ceramic following laser shock peening. / Shukla, Pratik; Nath, Subhasisa; Wang, Guanjun ; Shen, Xiaojun; Lawrence, Jonathan.

In: Journal of the European Ceramic Society, Vol. 37, No. 9, 08.2017, p. 3027-3038.

Research output: Contribution to journalArticle

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