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Dynamic Analysis of Residual Stress Introduced by Laser Peening
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Strengthening of Si3N4 Ceramics by Laser Peening
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Strengthening of Si3N4 Ceramics by Laser Peening

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Abstract:

Laser peening has been applied to silicon nitride (Si3N4) ceramics without any pre-coating. X-ray diffraction study revealed that plastic strain was introduced into the surface layer of the ceramics. Compressive residual stress was also imparted, which became larger with increasing peak power density of irradiated laser pulses. Surface roughness significantly increased due to ablative interaction of the surface with laser pulses. A Weibull plot of four-point bending test results clearly showed the increase of the bending strength and Weibull modulus by laser peening in spite of the increase of the surface roughness.

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Periodical:

Materials Science Forum (Volumes 524-525)

Pages:

141-146

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.524-525.141

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Online since:

September 2006

Authors:

Koichi Akita, Yuji Sano, Kazuma Takahashi, Hirotomo Tanaka, Shin Ichi Ohya

Keywords:

Bend Strength, Ceramic, Laser Peening, Plastic Deformation, Residual Stress

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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