Thermal Effect at the Incipient Stage of Cavitation Erosion on a Stainless Steel in Ultrasonic Vibration Cavitation

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
Chen Haosheng ◽  
Li Jiang ◽  
Liu Shihan
Keyword(s):  
Thermal Effect ◽  
Ultrasonic Vibration ◽  
Cavitation Erosion ◽  
Solid Wall ◽  
Sample Surface ◽  
Necessary Condition ◽  
Erosion Process ◽  
Cooling Process ◽  
Incipient Stage ◽  
Tempering Process

An ultrasonic vibration cavitation erosion experiment was performed to study the thermal effect during the erosion process. The ring affected zone was observed on the sample surface around the erosion pit at the incipient stage of the cavitation erosion. The results of the surface testing on roughness, hardness, and chemical composition proved that the zone was caused by thermal effect, and that the zone surface experienced a tempering process with the temperature higher than 300°C. Numerical simulation results show that the high temperature domain in the bubble directly contacting the solid wall is a necessary condition for the occurrence of the tempering process on the zone surface, or the heat in the bubble can hardly be transferred to the solid wall under the effects of the great temperature gradient in the bubble and the quick cooling process in the water.

Research of the Pits Induced by MnS Inclusions at the Incipient Stage of Cavitation Erosion

2009 ◽  
pp. 782-784
Author(s):  
Jiang Nana ◽  
Liu Shihan ◽  
Chen Haosheng ◽  
Wang Jiadao ◽  
Chen Darong
Keyword(s):  
Cavitation Erosion ◽  
Incipient Stage

Design and Performance of Slurry Erosion Tester

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
A. Abouel-Kasem ◽  
Y. M. Abd-elrhman ◽  
K. M. Emara ◽  
S. M. Ahmed
Keyword(s):  
Impact Velocity ◽  
Erosion Rate ◽  
Sample Surface ◽  
Erosion Process ◽  
Impingement Angle ◽  
Slurry Erosion ◽  
Erosion Test ◽  
And Performance ◽  
Paint Removal ◽  
The Impact

A slurry whirling arm erosion test ring was constructed and a series of erosion tests and post-erosion analysis were carried out using a paint erosion indication technique. The pattern of the paint removal presented a highly visual and accelerated map for the erosion process and its behavior. Also, the erosion rate of paint removal was investigated under a number of erosion variables. It was observed that the rebounding of the erodent particles from the sample surface play an important role in developing erosion for this tester. The erosion pattern showed that the effect of the rebound particles depends on the impact velocity and impingement angle. It was also observed that the erosion behavior of paint as a function of impingement angle, impact velocity, and erosion time was similar to that reported in literature for engineering materials. The slurry whirling arm erosion tester seems to be promising for simulating the slurry process in real cases.

scholarly journals Wear and Cavitation Erosion Resistance of an AlMgSc Alloy Produced by DMLS

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 308 ◽  
Author(s):  
Marialaura Tocci ◽  
Annalisa Pola ◽  
Luca Girelli ◽  
Francesca Lollio ◽  
Lorenzo Montesano ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Mass Loss ◽  
Material Removal ◽  
Cavitation Erosion ◽  
Sample Surface ◽  
Total Mass Loss ◽  
Linear Behavior ◽  
Cavitation Erosion Resistance ◽  
Pin On Disk ◽  
Disk Test

Pin-on-disk and cavitation tests were performed on an innovative Al-Mg alloy modified with Sc and Zr for additive manufacturing, which was tested in annealed condition. The damaging mechanisms were studied by observations of the morphology of the sample surface after progressive testing. These analyses allowed the identification of an adhesive wear mechanism in the first stages of pin-on-disk test, which evolved into a tribo-oxidative one due to the formation and fragmentation of an oxide layer with increasing testing distance. Regarding cavitation erosion, the AlMgSc alloy was characterized by an incubation period of approximately 1 h before mass loss was measured. Once material removal started, mass loss had a linear behavior as a function of exposure time. No preferential sites for erosion were identified, even though after some minutes of cavitation testing, the boundaries of melting pools can be seen. The comparison with literature data for AlSi10Mg alloy produced by additive manufacturing technology shows that AlMgSc alloy exhibits remarkable wear resistance, while the total mass loss after 8 h of cavitation testing is significantly higher than the value recorded for AlSi10Mg alloy in as-built condition.

scholarly journals The relation between the high speed submerged cavitating jet behaviour and the cavitation erosion process

2016 ◽  
Vol 83 ◽  
pp. 27-38 ◽  
Author(s):  
Ezddin Hutli ◽  
Milos S. Nedeljkovic ◽  
Nenad A. Radovic ◽  
Attila Bonyár
Keyword(s):  
High Speed ◽  
Cavitation Erosion ◽  
Erosion Process ◽  
Cavitating Jet

Study on the Distribution of Residual Stresses for Nondestructive Marking by Laser Shock Wave

2010 ◽  
Vol 426-427 ◽  
pp. 454-457
Author(s):  
Jin Zhon Lu ◽  
Kai Yu Luo ◽  
P.P. Yuan ◽  
Su Min Yin ◽  
Yong Kang Zhang
Keyword(s):  
Shock Wave ◽  
Liquid Crystal ◽  
Laser Ablation ◽  
Residual Stresses ◽  
Thermal Effect ◽  
Sample Surface ◽  
Laser Shock ◽  
Two Dimension ◽  
Laser Shock Wave ◽  
Compressive Residual Stresses

The marking system by laser shock wave (LSW) based on liquid crystal mask, which differs entirely from marking by laser ablation (or laser thermal effect), was established. Two-dimension (2D) nondestructive markings based on liquid crystal mask were prepared by LSW, and the distribution of residual stresses in laser-shocked region was measured and analyzed. The results showed that tensile residual stresses of sample surface were converted into compressive residual stresses by LSW, which is a nondestructive marking for aviation key parts.

125 Study on Evaluation of Cavitation Erosion Property of Hard Coating by Using Ultrasonic Vibration

2010 ◽  
Vol 2010.18 (0) ◽  
pp. _125-1_-_125-2_
Author(s):  
Yasuyuki ISHIDA ◽  
Tomoyuki KAWASHIMA ◽  
Ryo TSUBOI ◽  
Shinya SASAKI
Keyword(s):  
Ultrasonic Vibration ◽  
Cavitation Erosion ◽  
Hard Coating ◽  
Erosion Property

Accelerated Cryogenic Cooling Caused by the Temporary Frost Layer Enhancer

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Gedalya Mazor ◽  
Izhak Ladizhensky ◽  
Dmitry Nemirovsky ◽  
Alon Alfi ◽  
Andrei Rabin ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Cryogenic Treatment ◽  
Environmental Parameters ◽  
Sample Surface ◽  
Cryogenic Cooling ◽  
Moist Air ◽  
Cooling Process ◽  
Layer Development ◽  
Frost Layer

The possibility of using a frost layer, created on the surface of a sample that undergoes cryogenic treatment, as a heat transfer enhancer was recently studied. This layer grows on the preliminary cooled sample surface as a result of its contact with moist air flow prior to its immersion into liquid nitrogen. A significant increase in the outflow heat flux (up to 12.8 times), or, alternatively, a cooling time shortening, in comparison with the bare sample was found. A detailed description of the frost layer development along with the influence of the thickness of the layer on the efficiency of the cooling process, as well as environmental parameters that affect the thickness itself is presented in the paper.

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