In this study, the effect of laser shock peening treatment on the cavitation erosion resistance of a stainless-steel type used in pump blades was characterized. The goal of the study was to compare and define the better process parameters of the treatment effective in improving the cavitation erosion resistance of the stainless-steel type. An experimental investigation was conducted using the vibratory apparatus with compliance to ASTM G32 standards. Specimens made of stainless steel 304 were treated using different laser pulse density, and beam size with a 50% overlap. Prior to the cavitation erosion test, the incubation time of the samples was estimated from previous tests of similar samples. Each sample was subjected to ultrasonic pressure pulses at different exposure times using a constant amplitude. mass loss was recorded for each
The incubation period was used to characterize the materials impact resistance and the cavitation erosion resistance was achieved using mass loss tests and represented as the reciprocal of the cumulative volume loss rates. The mean depth of penetration was calculated from volume loss and affirmed using the cavitation erosion profile, measured with contact profilometer. The effect of exposure time on the mean depth was analyzed and found to stabilize after significant exposure time. The mean eroded depth was also compared to the compressive residual stress induced during the laser treatment and used quantitatively to describe the cavitation damage of SS304. The correlation between the cavitation erosion resistance and properties of the improved samples was perused. The variation of the cumulative volume loss with exposure time indicated improvement of the materials cavitation erosion resistance. The results of the study hawed that SS304 treated with higher power density depicted the highest erosion resistance whiles SS304 with lower power density showed the highest impact resistance during the incubation period. The summary of the results in the conclusion explains the outcome of the investigation.
Anotace v angličtině
In this study, the effect of laser shock peening treatment on the cavitation erosion resistance of a stainless-steel type used in pump blades was characterized. The goal of the study was to compare and define the better process parameters of the treatment effective in improving the cavitation erosion resistance of the stainless-steel type. An experimental investigation was conducted using the vibratory apparatus with compliance to ASTM G32 standards. Specimens made of stainless steel 304 were treated using different laser pulse density, and beam size with a 50% overlap. Prior to the cavitation erosion test, the incubation time of the samples was estimated from previous tests of similar samples. Each sample was subjected to ultrasonic pressure pulses at different exposure times using a constant amplitude. mass loss was recorded for each
The incubation period was used to characterize the materials impact resistance and the cavitation erosion resistance was achieved using mass loss tests and represented as the reciprocal of the cumulative volume loss rates. The mean depth of penetration was calculated from volume loss and affirmed using the cavitation erosion profile, measured with contact profilometer. The effect of exposure time on the mean depth was analyzed and found to stabilize after significant exposure time. The mean eroded depth was also compared to the compressive residual stress induced during the laser treatment and used quantitatively to describe the cavitation damage of SS304. The correlation between the cavitation erosion resistance and properties of the improved samples was perused. The variation of the cumulative volume loss with exposure time indicated improvement of the materials cavitation erosion resistance. The results of the study hawed that SS304 treated with higher power density depicted the highest erosion resistance whiles SS304 with lower power density showed the highest impact resistance during the incubation period. The summary of the results in the conclusion explains the outcome of the investigation.
In this study, the effect of laser shock peening treatment on the cavitation erosion resistance of a stainless-steel type used in pump blades was characterized. The goal of the study was to compare and define the better process parameters of the treatment effective in improving the cavitation erosion resistance of the stainless-steel type. An experimental investigation was conducted using the vibratory apparatus with compliance to ASTM G32 standards. Specimens made of stainless steel 304 were treated using different laser pulse density, and beam size with a 50% overlap. Prior to the cavitation erosion test, the incubation time of the samples was estimated from previous tests of similar samples. Each sample was subjected to ultrasonic pressure pulses at different exposure times using a constant amplitude. mass loss was recorded for each
The incubation period was used to characterize the materials impact resistance and the cavitation erosion resistance was achieved using mass loss tests and represented as the reciprocal of the cumulative volume loss rates. The mean depth of penetration was calculated from volume loss and affirmed using the cavitation erosion profile, measured with contact profilometer. The effect of exposure time on the mean depth was analyzed and found to stabilize after significant exposure time. The mean eroded depth was also compared to the compressive residual stress induced during the laser treatment and used quantitatively to describe the cavitation damage of SS304. The correlation between the cavitation erosion resistance and properties of the improved samples was perused. The variation of the cumulative volume loss with exposure time indicated improvement of the materials cavitation erosion resistance. The results of the study hawed that SS304 treated with higher power density depicted the highest erosion resistance whiles SS304 with lower power density showed the highest impact resistance during the incubation period. The summary of the results in the conclusion explains the outcome of the investigation.
Anotace v angličtině
In this study, the effect of laser shock peening treatment on the cavitation erosion resistance of a stainless-steel type used in pump blades was characterized. The goal of the study was to compare and define the better process parameters of the treatment effective in improving the cavitation erosion resistance of the stainless-steel type. An experimental investigation was conducted using the vibratory apparatus with compliance to ASTM G32 standards. Specimens made of stainless steel 304 were treated using different laser pulse density, and beam size with a 50% overlap. Prior to the cavitation erosion test, the incubation time of the samples was estimated from previous tests of similar samples. Each sample was subjected to ultrasonic pressure pulses at different exposure times using a constant amplitude. mass loss was recorded for each
The incubation period was used to characterize the materials impact resistance and the cavitation erosion resistance was achieved using mass loss tests and represented as the reciprocal of the cumulative volume loss rates. The mean depth of penetration was calculated from volume loss and affirmed using the cavitation erosion profile, measured with contact profilometer. The effect of exposure time on the mean depth was analyzed and found to stabilize after significant exposure time. The mean eroded depth was also compared to the compressive residual stress induced during the laser treatment and used quantitatively to describe the cavitation damage of SS304. The correlation between the cavitation erosion resistance and properties of the improved samples was perused. The variation of the cumulative volume loss with exposure time indicated improvement of the materials cavitation erosion resistance. The results of the study hawed that SS304 treated with higher power density depicted the highest erosion resistance whiles SS304 with lower power density showed the highest impact resistance during the incubation period. The summary of the results in the conclusion explains the outcome of the investigation.
A research of processes dedicated for the improvement of the cavitation resistance of technical surfaces with a special focus to the laser shock peening process
Parameters used to evaluate the improvement of the strength of the treated material surface
The assembly of an experimental setup for the cavitation resistance testing
The preparation of samples using the laser shock peening method
The measurement of cavitation erosion resistance for selected samples
The evaluation of measurements results and recommendations for the application of the modification process
Zásady pro vypracování
A research of processes dedicated for the improvement of the cavitation resistance of technical surfaces with a special focus to the laser shock peening process
Parameters used to evaluate the improvement of the strength of the treated material surface
The assembly of an experimental setup for the cavitation resistance testing
The preparation of samples using the laser shock peening method
The measurement of cavitation erosion resistance for selected samples
The evaluation of measurements results and recommendations for the application of the modification process
Seznam doporučené literatury
KIM, Ki-Han, Georges CHAHINE, Jean-Pierre FRANC a Ayat KARIMI. Advanced experimental and numerical techniques for cavitation erosion prediction. Dordrecht: Springer, [2014]. Fluid mechanics and its applications, v. 106.
FRANC, Jean-Pierre a Jean-Marie MICHEL. Fundamentals of cavitation. Boston: Kluwer Academic Publishers, c2004. ISBN 1402022328.
BRENNEN, Christopher E. Cavitation and bubble dynamics. New York: Cambridge University Press, c2014. ISBN 978-1-107-64476-2.
TAKATA, Tomoki, Manabu ENOKI, Pornthep CHIVAVIBUL, Akinori MATSUI a Yuji KOBAYASHI. Effect of Confinement Layer on Laser Ablation and Cavitation Bubble During Laser Shock Peening. MATERIALS TRANSACTIONS. 2016, 57(10), 1776-1783.
SOYAMA, Hitoshi. Key Factors and Applications of Cavitation Peening. Int. Journ. of Peening Science and Technology. 2018, 1(1), 3-60.
Seznam doporučené literatury
KIM, Ki-Han, Georges CHAHINE, Jean-Pierre FRANC a Ayat KARIMI. Advanced experimental and numerical techniques for cavitation erosion prediction. Dordrecht: Springer, [2014]. Fluid mechanics and its applications, v. 106.
FRANC, Jean-Pierre a Jean-Marie MICHEL. Fundamentals of cavitation. Boston: Kluwer Academic Publishers, c2004. ISBN 1402022328.
BRENNEN, Christopher E. Cavitation and bubble dynamics. New York: Cambridge University Press, c2014. ISBN 978-1-107-64476-2.
TAKATA, Tomoki, Manabu ENOKI, Pornthep CHIVAVIBUL, Akinori MATSUI a Yuji KOBAYASHI. Effect of Confinement Layer on Laser Ablation and Cavitation Bubble During Laser Shock Peening. MATERIALS TRANSACTIONS. 2016, 57(10), 1776-1783.
SOYAMA, Hitoshi. Key Factors and Applications of Cavitation Peening. Int. Journ. of Peening Science and Technology. 2018, 1(1), 3-60.
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