APPLIED LASER, Volume. 33, Issue 3, 294(2013)
Measure and Analysis the Residual Stress of the Area of Protective Coating Containing Ni by Pulsed Laser Discrete Scratching Testing
In the experiment, we use pulsed laser to conduct discrete scratching on Ni-containing stainless steel protective coating, and measured residual stress of the area, which discrete scratched by laser ,by the X350A ray diffraction system. We studied the residual stress status and analyzed the effects of laser shock waves stress on interfacial binding strength of film coating. The results show that in the center region of coating by laser loaded produced a uniform residual compressive stress, however, compressive residual stress decreases sharply even lead to surface tensile residual stress at the edge of the region. The study also indicates that the value of the residual compressive stress of coating, discrete scratching by laser, increase with increasing power density of laser. However, when the power density of laser is near to the threshold value, the residual compressive stress has decreased because the film begin to crack initiation and de-bonding. When the laser energy density is large enough, the strong shock waves can lead to tensile stress, crazed and broken of interface between Ni-containing and substrate at the spot edge of the region.
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Cao Yupeng, Xue Wei, Feng Aixin, Han Zhenchun. Measure and Analysis the Residual Stress of the Area of Protective Coating Containing Ni by Pulsed Laser Discrete Scratching Testing[J]. APPLIED LASER, 2013, 33(3): 294
Received: Nov. 10, 2012
Accepted: --
Published Online: Aug. 28, 2013
The Author Email: Yupeng Cao (cyp19812004@126.com)