Surface Ripple Formation Due to Solid-Liquid Slurry Erosion

2009 ◽  
Author(s):  
Juan Liu
Keyword(s):  
Structural Steel ◽  
Laboratory Tests ◽  
Impact Angle ◽  
Solid Particles ◽  
Ceramic Surface ◽  
Metallic Surfaces ◽  
Slurry Erosion ◽  
Water Slurry ◽  
Ripple Formation ◽  
The Impact

The development of ripples and erosion on the material surfaces in a centrifugal slurry pump was investigated in laboratory tests using a sand-water slurry pot tester. The erosion of the primary material (KmTBCr26) used in the centrifugal slurry pumps was very serious. The ripple formation was influenced by the flow conditions, the impact angle of the solid particles and the particle size. Ripple formation was also observed in laboratory tests with structural steel (#40) and brittle ceramics (Al2O3, ZTA, Si3N4). The ripple profile on the structural steel surface was similar to that on the high chrome cast iron (Cr26) used in the slurry pumps. With 90° impact angles, ripples also formed on the eroded surfaces of materials tested in the sand-water slurry pot. The ripple wavelength on the ceramic surface, which was influenced by the mechanical properties and material grain size, was less than that on the metallic surfaces.

scholarly journals Combined wear of slurry erosion, cavitation erosion, and corrosion on the simulated ship surface

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401983445 ◽  
Author(s):  
Liang Liang ◽  
Youxia Pang ◽  
Yong Tang ◽  
Hao Zhang ◽  
Hui Liu ◽  
...  
Keyword(s):  
Cavitation Erosion ◽  
Strong Support ◽  
Wear Test ◽  
Solid Particles ◽  
Surface Material ◽  
Slurry Erosion ◽  
Wear Rates ◽  
Ductile Materials ◽  
Ship Hulls ◽  
The Impact

The surface material of marine ship hulls suffers degradation by slurry erosion because of the impact of sands or solid particles in seawater. When the ship’s moving speed increases, pressure is changed suddenly and cavitation erosion will occur. Therefore, in the ocean, the corrosion of the surface material of the ship hulls is a combined damage in a slurry erosion and cavitation erosion states. An experimental device, for the combined wear, capable of simulating the above working conditions is designed and manufactured. A combined wear test of various materials (Q235, DH32, and NM360 steels) is conducted. The results show that cutting furrows of the slurry erosion, pinholes of the cavitation erosion, holes of electrochemical corrosion, and their combined effect increase the material wear rates and areas. Ductile materials of high strength have less slurry and cavitation damage, and more corrosion damage. For ductile materials of low strength, slurry and cavitation wear play an important role. When the slurry impact speed is increased, the wear degree of materials is also increased. This experimental setup for the combined wear provides a strong support for the development of wear-resistant materials for ship hulls and the structural optimization of ship hulls.

Stepwise Erosion as a Method for Investigating the Wear Mechanisms at Different Impact Angles in Slurry Erosion

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Y. M. Abd-Elrhman ◽  
A. Abouel-Kasem ◽  
S. M. Ahmed ◽  
K. M. Emara
Keyword(s):  
Rebound Effect ◽  
Impact Angle ◽  
Silica Sand ◽  
Slurry Erosion ◽  
Nominal Size ◽  
Erosion Mechanisms ◽  
Impact Angles ◽  
The Impact ◽  
Calculated Number ◽  
Number Of Particles

In the present work, stepwise erosion technique was carried out to investigate in detail the influence of impact angle on the erosion process of AISI 5117 steel. The number of impact sites and their morphologies at different impact angles were investigated using scanning electron microscope (SEM) examination and image analysis. The tests were carried out with particle concentration of 1 wt. %, and the impact velocity of slurry stream was 15 m/s. Silica sand—which has a nominal size range of 250–355 μm—was used as an erodent, using whirling-arm test rig. The results have shown that the number of craters, as expected, increases with the increase in the mass of erodent for all impact angles and this number decreases with the increase of the impact angle. In addition, the counted number of craters is larger than the calculated number of particles at any stage for all impact angles. This may be explained by the effect of the rebound effect of particles, the irregular shape for these particles, and particle fragmentation. The effect of impact angle based on the impact crater shape can be divided into two regions; the first region for θ ≤ 60 deg and the second region for θ ≥ 75 deg. The shape of the craters is related to the dominant erosion mechanisms of plowing and microcutting in the first region and indentation and lip extrusion in the second region. In the first region, the length of the tracks decreases with the increase of impact angle. The calculated size ranges are from few micrometers to 100 μm for the first region and to 50 μm in the second region. Chipping of the former impact sites by subsequent impact particles plays an important role in developing erosion.

scholarly journals An Influence of Factors of Flow Condition, Particle and Material Properties on Slurry Erosion Resistance

2019 ◽  
Vol 19 (2) ◽  
pp. 28-53 ◽  
Author(s):  
M. H. Buszko ◽  
A. K. Krella
Keyword(s):  
Material Properties ◽  
Erosion Resistance ◽  
Synergistic Effects ◽  
Impact Angle ◽  
Operating Conditions ◽  
Slurry Erosion ◽  
Particle Properties ◽  
Different Types ◽  
Degradation Of Materials ◽  
The Impact

AbstractThe degradation of materials due to slurry erosion is the serious problem which occurs in the power industries. The paper presents actual knowledge about an influence of individual factors connected with flow conditions, particles and material properties on the slurry erosion resistance. Among the factors connected with operating conditions, an influence of impact angle, and velocity of impact, particle concertation and liquid temperature have been described. In case of the factors connected with solid particle properties, an influence of the size, shape and hardness have been discussed. In the part devoted to the impact of material properties, due to different types of materials, the issues of resistance to erosion of slurries related to the properties of steel, ceramics and polymers are discussed separately. In the paper has been shown that a change of any of mentioned factors causes a change in the erosion rate due to the synergistic effects that accompany to slurry degradation.

scholarly journals Slurry Erosion–Corrosion Characteristics of As-Built Ti-6Al-4V Manufactured by Selective Laser Melting

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 3967 ◽  
Author(s):  
Saleh Ahmed Aldahash ◽  
Osama Abdelaal ◽  
Yasser Abdelrhman
Keyword(s):  
Selective Laser Melting ◽  
Tap Water ◽  
Pure Water ◽  
Impact Angle ◽  
High Mass ◽  
Slurry Erosion ◽  
Laser Melting ◽  
Erosion Corrosion ◽  
Impact Angles ◽  
The Impact

Erosion and erosion–corrosion tests of as-built Ti-6Al-4V manufactured by Selective Laser Melting were investigated using slurries composed of SiO2 sand particles and either tap water (pure water) or 3.5% NaCl solution (artificial seawater). The microhardness value of selective laser melting (SLM)ed Ti-6Al-4V alloy increased as the impact angle increased. The synergistic effect of corrosion and erosion in seawater is always higher than erosion in pure water at all impact angles. The seawater environment caused the dissolution of vanadium oxide V2O5 on the surface of SLMed Ti-6Al-4V alloy due to the presence of Cl− ions in the seawater. These findings show lower microhardness values and high mass losses under the erosion–corrosion test compared to those under the erosion test at all impact angles.

Effect of Impact Angle on Erosion Wear Behaviours of SiCp/Cast Iron Surface Composite

2012 ◽  
Vol 724 ◽  
pp. 339-342 ◽  
Author(s):  
Zhen Lin Lu ◽  
Han Jin ◽  
Yong Xin Zhou ◽  
Hui Xie
Keyword(s):  
Cast Iron ◽  
Wear Rate ◽  
Impact Angle ◽  
Iron Surface ◽  
Erosion Wear ◽  
Slurry Erosion ◽  
Wear Process ◽  
Surface Composite ◽  
Molten Cast Iron ◽  
The Impact

The slurry erosion wear performances of the SiCp/cast iron surface composite, which was prepared by infiltrating molten cast iron into SiC particles preforms, were studied on self-made slurry inject erosion wear machine. The results show that the erosion wear rate of the SiCp/cast iron surface composite would be the lowest at impact angle of 30°, and the largest at impact angle of 60°. The erosion wear rate increases gradually when impact angle is changed from 30° to 60°, and then decreased with increasing the impact angle. The erosion wear mechanism of the SiCp/cast iron surface composite is dominated by cutting and grooving at low impact angle, and by fatigue spalling and cutting at high impact angle. For the gray cast iron, the erosion wear rate of would be increased gradually with the increase of impact angle, reaching the peak value at 90°, which indicates the typical characteristics of brittle material in slurry erosion wear process.

scholarly journals Numerical Investigation of Slurry Erosive Wear Due to Multiple Particle Impact

2018 ◽  
Vol 7 (2) ◽  
pp. 109-115
Author(s):  
Mithlesh Sharma ◽  
Deepak Kumar Goyal ◽  
Gagandeep Kaushal
Keyword(s):  
Removal Rate ◽  
Substrate Surface ◽  
Base Material ◽  
Erosive Wear ◽  
Solid Particles ◽  
Hydropower Plant ◽  
Slurry Erosion ◽  
Depth Of Penetration ◽  
Element Analysis ◽  
The Impact

In the present work, an attempt has been made to investigate the slurry erosion problem using numerical simulation approach. AISI304 steel has been chosen as the base material for the present study. Performance of AISI304 steel under the range of slurry erosion conditions such as an impact angle and impact velocity of the erodent particles are investigated using laboratory developed slurry erosion test rig. To simulate the similar conditions virtually as available in the hydropower plant, finite element analysis software named as Abaqus has been used. Model has been developed using explicit dynamic solver approach. For correlating the behavior of the material with real time conditions, Johnson cook material model and failure model has been used. To simulate the solid particles impact, general contact penalty method has been adopted. Erosive wear rate is correlated with material removal rate and depth of penetration. It has been observed that the simulated results using Abaqus explicit are in confirmation with the experimental results. Furthermore, to analyze the mechanism of erosion, substrate surface was analyzed with reference to stresses and plastic strains developed by the impact of erodent particles.

Effect of Impact Angle on Slurry Erosion Behavior and Mechanisms of Carburized AISI 5117 Steel

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Y. M. Abd-Elrhman ◽  
A. Abouel-Kasem ◽  
K. M. Emara ◽  
S. M. Ahmed
Keyword(s):  
Erosion Resistance ◽  
Impact Angle ◽  
Silica Sand ◽  
Ductile Material ◽  
Hardness Profile ◽  
Slurry Erosion ◽  
Erosion Behavior ◽  
Nominal Size ◽  
Impact Angles ◽  
The Impact

The paper reports the influence of carburizing on the slurry erosion behavior of AISI 5117 steel using a whirling-arm rig. The microstructure and hardness profile of the surface layer of carburized steel were investigated. For characterizing the slurry damage process and for better understanding of material removal at different angles, scanning electron microscope (SEM) images at different locations on eroded surface using stepwise erosion combined with relocation SEM were presented. The study is also focused on studying the erosion wear resistance properties of AISI 5117 steel after carburizing at different impact angles. The tests were carried out with particle concentration of 1 wt. %, and the impact velocity of slurry stream was 15 m/s. Silica sand has a nominal size range of 250 – 355 μm was used as an erodent. The results showed that, carburizing process of steel increased the erosion resistance and hardness compared with untreated material for all impact angles. The erosion resistance of AISI 5117 steel increases by 75%, 61%, 33%, 10% at an impact angle of 30 deg, 45 deg, 60 deg, and 90 deg, respectively, as result of carburizing, i.e., the effectiveness of carburizing was the highest at low impact angles. Treated and untreated specimens behaved as ductile material, and the maximum mass loss appeared at impact angle of 45 deg. Plough grooves and cutting lips appeared for acute impact angle, but the material extrusions were for normal impact angles. The erosion traces were wider and deeper for untreated specimens comparing by the shallower and superficial ones for the carburized specimens. Chipping of the former impact sites by subsequent impact particles plays an important role in developing erosion.

Fractal Characterization of Slurry Eroded Surfaces at Different Impact Angles

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Abouel-Kasem ◽  
M. A. Al-Bukhaiti ◽  
K. M. Emara ◽  
S. M. Ahmed
Keyword(s):  
Erosion Rate ◽  
Impact Angle ◽  
Oblique Impact ◽  
Slurry Erosion ◽  
Normal Impact ◽  
Power Spectral ◽  
Impact Angles ◽  
The Impact ◽  
The Relationship

In the present work, the topographical images of slurry erosion surfaces at different impact angles were quantified using fractal analysis. The study showed that the variation of fractal value of slope of linearized power spectral density with the impact angle is largely similar to the relationship between the erosion rate and the impact angle. Both the fractal value and erosion rate were maximum at 45 deg and 90 deg for ductile and brittle materials, respectively. It was found also that the variation of fractal values versus the impact angle has a general trend that does not depend on magnification factor. The fractal features to the eroded surfaces along different directions showed high directionality at oblique impact angle and were symmetrical at normal impact.

A New Methodology for Erosion Prediction Using Eulerian-Eulerian CFD Models

2015 ◽  
Author(s):  
Gianandrea V. Messa ◽  
Irene Ingrosso ◽  
Stefano Malavasi
Keyword(s):  
Fluid Dynamic ◽  
Fluid Phase ◽  
Impact Angle ◽  
Solid Particles ◽  
Dynamic Parameters ◽  
Gas Industry ◽  
Erosion Prediction ◽  
Cfd Models ◽  
Erosion Models ◽  
The Impact

The erosion of a surface caused by the impact of solid particles dragged by a fluid is a serious concern in the oil&gas industry. At present, the erosion prediction is performed using algebraic erosion models which express the volume of eroded material per impact as a function of the mass of the abrasive particles as well as of fluid dynamic parameters (such as the impact velocity and the impact angle of the eroding particle) and properties of the materials involved in the process. The fluid dynamic parameters are, in turn, evaluated using Eulerian-Lagrangian CFD models which interpret the fluid phase as a continuous mean and follow the trajectories of all the particles. However, the huge computational burden makes it difficult, or even precludes, to adopt this approach in many flows of engineering interest. An innovative methodology is proposed for estimating the parameters required as input by the erosion models using computationally cheaper Eulerian-Eulerian CFD models which solve for the average properties of the ensamble of particles. The good results obtained when predicting the erosion caused the by impingement of an abrasive jet against a surface make the application of this methodology to more complex flows very promising.

The Effects of Constant Kinetic Energy of Different Impacting Particles on Slurry Erosion Wear of AA 6063

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Bhushan D. Nandre ◽  
Girish R. Desale
Keyword(s):  
Silicon Carbide ◽  
Kinetic Energy ◽  
Mass Loss ◽  
Material Removal ◽  
Impact Angle ◽  
Solid Particles ◽  
Erosion Wear ◽  
Normal Impact ◽  
Sem Images ◽  
The Impact

The present experimental study investigates the effect of constant kinetic energy on erosion wear of aluminum alloy 6063. Three different natural erodents (quartz, silicon carbide, and alumina) with different particle sizes are used to impact at 45 deg and 90 deg impact angles. For calculating the number of particles in the slurry pot, it is assumed that the solid particles are of spherical shape. The total numbers of impacting solid particles were kept constant by adjusting the solid concentration, velocity, and test duration. The scanning electron microscope (SEM) images of the three erodents show that the alumina particles have sharp edges with more angularity, and silicon carbide particles have subangular nature while quartz particles are blocky in shape. The mass loss per particle at 45 deg impact angle is observed higher than at normal impact angle. It may be due to the change in material removal mechanism with changing the impact angle. It is also found that the mass loss per particle from the target material having different particle size with constant kinetic energy remains constant for respective erodents. This indicates that the velocity exponent of impacting particles is around 2. The SEM images of eroded surfaces reveal the different mechanisms of material removal at 45 deg impact angle and at normal impact angle.

Sign in / Sign up

Export Citation Format

Share Document