Investigation Into Cavitation Erosion Pits

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
A. Abouel-Kasem ◽  
A. Ezz El-Deen ◽  
K. M. Emara ◽  
S. M. Ahmed
Keyword(s):  
Stainless Steel ◽  
Cavitation Erosion ◽  
Pure Aluminum ◽  
The Other ◽  
304 Stainless Steel ◽  
Testing Time ◽  
Limited Effect ◽  
Fatigue Process

Cavitation erosion pits and their effects on erosion progression were investigated in detail for SUS 304 stainless steel, α+β brass (60/40), and pure aluminum (Al-99.999 and Al-99.92) by means of vibratory erosion. Two kinds of erosion pits were found on the specimen surfaces, one by microjet impact and the other by shockwave blow. Systematic observations of the feature of microjet-pits with the testing time showed that the sizes and shapes of microjet-pits did not change at all and such pits scarcely played an important role in developing the erosion. Moreover, the feature morphology of eroded surfaces, and dislodged particles and their large sizes revealed that microjet-pits had a limited effect on erosion and that the predominant failure was a fatigue process.

scholarly journals Effect of Friction Pressure on Microstructure and Properties of Friction Welded Joints of Pure Aluminum/304 Stainless Steel

2021 ◽  
Author(s):  
Lizhe ZHAO ◽  
Wenbiao GONG ◽  
Rui ZHU ◽  
Mingyue GONG ◽  
Heng CUI
Keyword(s):  
Stainless Steel ◽  
Friction Welding ◽  
Pure Aluminum ◽  
Hardness Test ◽  
304 Stainless Steel ◽  
Joint Surface ◽  
X Ray Diffraction ◽  
Metallurgical Bonding ◽  
Friction Pressure ◽  
Mechanical Bonding

Continuous drive friction welding was used to realize the high quality connection between pure aluminum and 304 stainless steel. The composition of interface micro-zone and mechanical properties of joint were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), tensile test and hardness test. The formation mechanism of intermetallic compound (IMC) during friction welding was discussed. The results show that under the experimental parameters, the joint surface is uneven and two intermetallic compounds, Fe2Al5 and FeAl3, are formed. With the increase of friction pressure, the mechanical bonding degree of the joint decreases, the metallurgical bonding degree increases, the element diffusion distance increases from 1.4 to 1.9 um, the tensile strength of the joint can reach or even higher than that of the base metal on the aluminum side, and the maximum hardness increased from 414 HV to 447 HV.

Effect of chemical heat treatment on cavitation erosion resistance of stainless steel

2019 ◽  
Vol 233 (11) ◽  
pp. 1753-1762
Author(s):  
Hongqin Ding ◽  
Shuyun Jiang ◽  
Jiang Xu
Keyword(s):  
Stainless Steel ◽  
Mass Loss ◽  
Diffusion Layer ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
304 Stainless Steel ◽  
Chemical Heat ◽  
Electrochemical Test ◽  
Diffusion Layers ◽  
Cavitation Erosion Resistance

The purpose of this paper is to study the effect of chemical heat treatments on cavitation erosion resistance of the 304 stainless steel. Three types of diffusion layers are prepared on the 304 stainless steel using gas nitriding, gas carburizing, and carbonitriding treatments. Phase composition and surface microstructure of the diffusion layers are characterized by X-ray diffraction and scanning electron microscopy. And then, the cavitation erosion behavior of the diffusion layers are tested and compared with the one of the 304 stainless steel. The cavitation test is performed in an ultrasonic vibration system integrated with an electrochemical workstation. The mass loss, scanning electron microscopic morphology, and electrochemical test are adopted to assess the surface damage of the diffusion layers. A measurement for the mechanical properties of the diffusion layers shows that the hardness and the elastic modulus of the gas nitrided diffusion layer, carbonitrided diffusion layer, carburized diffusion layer, and 304 stainless steel are 5.3 GPa and 260 GPa, 4.2 GPa and 236 GPa, 4.0 GPa and 210 GPa, 2.5 GPa and 193 GPa, respectively. A cavitation erosion test of 14 h shows that mass loss of the gas nitrided diffusion layer, carbonitrided diffusion layer, carburized diffusion layer, and 304 stainless steel is 5.19 mg, 8.97 mg, 14.37 mg, and 6.62 mg, respectively. The electrochemical test results also indicate that the gas nitrided diffusion layer has a higher corrosion resistance than the carburized diffusion layer, carbonitrided diffusion layer, and stainless steel under cavitation erosion condition. As a conclusion, the gas nitrided diffusion layer is capable of enhancing the cavitation erosion resistance of the stainless steel, while the carburized diffusion layer and carbonitrided diffusion layer increases the mass loss of the stainless steel under cavitation erosion condition.

Impact of surface ultrasonic rolling on cavitation erosion behavior of 304 stainless steel

2020 ◽  
Vol 383 ◽  
pp. 125280
Author(s):  
Chaoyong Li ◽  
Rongtao Zhu ◽  
Xinxi Zhang ◽  
Pengfei Huang ◽  
Xian Wang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Cavitation Erosion ◽  
304 Stainless Steel ◽  
Erosion Behavior

Cavitation Erosion Resistance of Sputter-Deposited Cr3Si Film on Stainless Steel

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Shuyun Jiang ◽  
Hongqin Ding ◽  
Jiang Xu
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Surface Damage ◽  
304 Stainless Steel ◽  
Glow Discharge Plasma ◽  
Damage Degree ◽  
Average Grain Size ◽  
Cavitation Erosion Resistance

In this technical brief, a Cr3Si nanocrystalline film was deposited on 304 stainless steel (SS) substrate using a double glow discharge plasma technique. The film was characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy, nanohardness tester, and scratch tester. The as-deposited film with a thickness of 5 μm consisted of A15 structured Cr3Si phase with an average grain size of 8 nm. The hardness values of the film were determined to be 26 GPa, which was ten times greater than 304 SS. A self-designed ultrasonic vibration cavitation erosion apparatus was employed to evaluate the cavitation erosion resistance of the Cr3Si film. The results showed that after cavitation tests of 30 hrs, the erosion mass loss of the film was only 60% of that for 304 SS substrate. SEM observation of the erosion surfaces indicated that the surface damage degree of the Cr3Si film is significantly less than that of 304 SS.

Sign in / Sign up

Export Citation Format

Share Document