Effect of Particles Type, Velocity, and Impact Angle on Slurry Erosion of Stainless Steel Using Simple Test Rig (original) (raw)
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Wear, 2005
The effect of particle velocity and mean impact angle on the corrosion-erosion of solubilized AISI 304 and quenched and tempered AISI 420 stainless steels was studied. The tests were performed using slurry composed of 0.5 M H 2 SO 4 + 3.5% NaCl and 30 wt% quartz particles with 0.21-0.30 mm mean diameter. Potentiodynamic curves, AFM and SEM analyses allowed identification of the wear mechanisms and assessment of the degree of surface damage. The slurry temperature was monitored and pH of solution and solid contents of the slurry were fixed during the tests. The results obtained for AISI 304 steel showed a gentle degradation regime for normal incidence and low impact velocity (4.5 m s −1 ), while a severe degradation regime was found for grazing incidence and high impact velocity (8.5 m s −1 ). The severe condition was characterized by intense plastic strain and formation of lips and prows. Mechanical effects were predominant over the corrosive ones, and the surface behaved mainly in a ductile manner. The results obtained for AISI 420 steel revealed a marked corrosion influence on degradation mechanisms. Moderate degradation was predominant at low impact velocity, while severe damage arose for higher velocities and both grazing and normal impact. Uniform, intergranular, pitting corrosion and corrosion-assisted erosion were the main degradation mechanisms. The higher corrosion-erosion resistance of the AISI 304 was attributed to its better response to corrosive attack, this factor being more relevant than hardness.
EROSION BEHAVIOUR OF STAINLESS STEEL
IRJET, 2022
In current year’s big development has been made each in gaining a fundamental perception of the giant parameters of put on and in making use of a substances methodology to mitigate the troubles of wear. While this mission work will solely tackle strong particle erosion, it is properly to hold in thought that different put on processes, e.g., abrasive put on and oxidative wear, contain many comparable traits and possibly mechanisms. Progress in grasp any one of these techniques can also be relevant to others, and to the improvement of greater put on resistant substances and systems. Testing on ferrous and non-ferrous substances has been broadly carried out to find out about their erosion resistance. Venkataraman & Sundararajan [1] carried out a learn about about the stable particle erosion of copper at a vary of low have an effect on velocities. In this unique case, the eroded floor used to be absolutely blanketed with the erosion particles in the structure of flakes or platelets. These flakes regarded to be definitely separated or fractured from the cloth floor and have been flattened via subsequent impacts. For this reason, it used to be concluded that at low affect velocities the erosion harm was once characterized on the whole via lip or platelet fracture whereas it used to be distinctive with lip formation (rather than its subsequent fracture) at greater affect velocities. In this undertaking erosion conduct of the stainless metal is evaluated via exposing the metal substrate to erodent at predefined pace and pressure. Effect of have an effect on perspective and erodent speed on erosion resistance of the metal substrate is studied with the assist of strong particle erosion setup.
Experimental technique to analyse the slurry erosion wear due to turbulence
2009
Erosion due to turbulence is a predominant factor in plant design for slurry handling. DUCOM Instruments (P) Ltd. has built a "counter rotating double disc erosion tester" to analyse surfaces for erosion due to turbulence. Volume loss of Stainless Steel and aluminum as a function of varying time, particle hardness, speed and slurry concentration is evaluated in this erosion tester. Individual study on the effect of corrosion on the total volume loss is conducted and found to be high in alumina slurry and low in silica slurry.
Effect of impact angle and testing time on erosion of stainless steel at higher velocities
Wear, 2014
Erosion is vitally important in aerospace and petrochemical industries, especially when the targets such as flight engines, gas control valves etc are subjected to high speed in an environment containing sand particles. A new erosion test rig, with a capability of producing a velocity greater than Mach 3, was built up to cater to this purpose. Results obtained from stainless steel testing showed that erosion rate was saturated at 120 s and reduced subsequently. In addition, the results of erosion rates at different impact angles indicated that severe erosion maximizes at an impact angle of 401. Further, erosion profiles showed different erosion effects on the sample surface. Surface roughness increased with respect to time and peaked at 451. Investigation into surface microstructure revealed different erosion mechanisms associated with different impact angles. The erosion mechanism transition from micro-plowing to indentation induced plastic deformation took place from low to high impact angles. Further, computational fluid dynamic model was used to compare with experimental results.
Effect of Impacting Particle Kinetic Energy on Slurry Erosion Wear
Journal of Bio- and Tribo-Corrosion, 2015
In the present investigation, the effect of kinetic energy of different materials of the same-sized solid particles is examined on copper as target material using slurry pot tester. Quartz, Silicon carbide and Alumina are the impacting solid particles used for conducting trials. It is understood that the kinetic energy and stress concentration of impacting particles on target surface are responsible for material removal from the target surface, also the effect of erodent property like its shape and density is more dominant at shallow impact angles compared to higher impact angles. However, it is reported in literature that the exponent of velocity varies from 1.87 to 4.00 for ductile materials. Thus, different materials with the same-sized solid particles at constant kinetic energy were used to conduct the experiments. It is observed that for three different materials mass loss for the same mean particle size is nearly constant at 90°orientation angle but variation is found in 30°orientation angle. Further, the SEM micrographs of these solid particles show that alumina have sharp edges and angular nature. Silicon carbide is sub-angular in nature while quartz is blocky in nature. SEM micrographs of eroded surfaces show that at shallow impact angles the material is mainly removed by the platelet mechanism and material is displaced in the direction of flow. Also it is observed that increasing the velocity for quartz particle increases the crater length as compared to other two materials. Erosion wear was found more when alumina are used as the impacting particle due to their angular nature. At normal impact, indentation craters with rim are observed with significance increase in crater size when quartz is used as impacting particles.
Experimental analysis of jet slurry erosion on martensitic stainless steel
IOP Conference Series: Materials Science and Engineering
Due to their enhanced tribological properties that contribute to an increased useful life of components, martensitic stainless steels are an excellent option for industrial applications such as hydroelectric, petrochemical, civil construction and mineral processing plants. In the present investigation, the erosive wear of AISI 410 martensitic stainless steel is evaluated after thermal treatment by quenching and tempering by mass loss, under erosive attack at 30• and 90• incidence angles, using a self-made jet slurry erosion equipment controlling parameters such as speed, volume of fluid, temperature and concentration of erosive particles of erodent. The characterization of the eroded samples was carried out in terms of the microstructure (SEM) and microhardness as well as the particle size distribution (LG) and morphology of the erodent. It was possible to establish the relationship between the slurry erosive wear and the physical properties inherent of stainless steel for this particular experimental configuration, concluding that the steel presents better resistance to jet slurry erosion wear when compared to austenitic steel commonly used in the industry.
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2018
Properties of flowing media (e.g. such as fly ash, bottom ash, coal, mineral tailings, sand slurries, etc.) play a crucial role in the service life of centrifugal slurry pump components. Generally, these solid particles vary in shape and size. In literature, a limited number of studies have been carried out to investigate the influence of particle size and shape on erosion wear. Stainless steel (SS 316L) is the most commonly used material for the fabrication of slurry pump components namely, casing, impeller, shafts, and sealing columns. In the present study, the influence of particle type and circularity factor on erosion wear of austenitic steel has been studied. A slurry pot tester (Ducom TR-41) was used to perform the experiments that established the erosion wear of slurry pump austenitic steel under the influence of the parameters noted above. Abrasives used in the current study are fly ash, bottom ash, and sand. Surface smoothness, circularity factor, coefficient of variance, ...
EROSION RATE OF STAINLESS STEEL DUE TO THE IMPACT OF SOLID PARTICLES
This paper deals with the erosion rate of stainless steels due to the impact of solid particulate. These materials are used in high temperature applications. Several theoretical models have been developed for determining the erosion resistance of ductile materials. These approaches assume a failure mode (so called micro cutting) which does not seem to be adequate, as has been proved experimentally. Moreover these models derive formulas for the eroded volume of material that depend on several constants which need to be determined experimentally. The great uncertainty of the experimental results, intrinsic to the erosion tests, together with the high expense involved led the author to develop alternative methods based on numerical simulations. On the basis of theoretical models, the author developed erosion criteria for ductile materials which could be implemented as Fortran routines in commercial FEM codes. The numerical simulations concern with multiple impacts of particles on stainless steel target. The erosion criterion, which looks like the energetic criterion of the fracture mechanic , was applied to the elements of the mesh step by step during the transient. A damage indicator for each element in a tensile stress state was calculated in every time step. This indicator represents the eroded fraction of the element in each time step and permits to eliminate the dependence of the results from the mesh size. Several analyses were performed considering different plasticity criteria, the dependence of the erosion rate on the strain rate, the temperature. The numerical results were compared with experimental and theoretical results. In spite of some simplifying assumptions, there was a good agreement between the numerical and experimental results. Moreover a theoretical erosion model for ductile material, developed by the author, agreed better than the other models being examined. The described numerical method could be a powerful means of assessing the erosion resistance of components in real operating conditions.