Solid Particle Erosion of Selected HVOF Sprayed Coatings

2016 ◽  
Vol 827 ◽  
pp. 39-46
Author(s):  
Šárka Houdková ◽  
Zdeněk Česánek ◽  
Pavel Polach
Keyword(s):  
Wear Resistance ◽  
Wear Mechanism ◽  
Thermal Spraying ◽  
Impact Angle ◽  
Erosion Wear ◽  
Wear Properties ◽  
Experimental Development ◽  
The Subject ◽  
The Impact ◽  
Super Alloy

The paper involves the subject and the chosen results of up to now solving of work package “Development of advanced surface treatment of components used in parts of turbines working under the condition of operational temperatures of steam using the HP/HVOF technology of thermal spraying” of the Competence Centre project “Centre of Research and Experimental Development of Reliable Energy Production”. The subject belongs to the field of material engineering and results of solving contribute to fulfilling the main project aim, which is a long time safeguarding of safe, reliable and financially available both classical thermal and nuclear sources of electric power, which consists in extending service life of existing and building new turbo generator blocks. The erosion wear resistance is one of the areas, which were observed. The impact of hard particles on the surface under variable impact angles was simulated in laboratory conditions using an in-house equipment. The wear resistance of selected HVOF sprayed hardmetal and super-alloy coatings was measured and the wear mechanism was evaluated. A strong influence of impact angle on both material volume loss and wear mechanism was monitored. The superior erosion wear properties of super-alloy coatings were proved, regardless the higher hardness of hardmetal coatings.

scholarly journals Effect of Silicon Addition on High-Temperature Solid Particle Erosion-Wear Behaviour of Mullite-SiC Composite Refractories Prepared by Nitriding Reactive

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaochao Li ◽  
Shusen Chen ◽  
Zhaohui Huang ◽  
Minghao Fang ◽  
Yan’gai Liu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Solid Particle ◽  
Elevated Temperatures ◽  
Silicon Powder ◽  
Wear Behaviour ◽  
Solid Particle Erosion ◽  
Erosion Wear ◽  
Particle Erosion ◽  
Powder Addition ◽  
The Impact

Solid particle erosion-wear experiments on as-prepared mullite-SiC composite refractories by nitriding reactive sintering were performed at elevated temperatures, using sharp black SiC abrasive particles at an impact speed of 50 m/s and the impact angle of 90° in the air atmosphere. The effects of silicon powder addition and erosion temperature on the erosion-wear resistance of mullite-SiC composite refractories were studied. The test results reveal that Si powders caused nitriding reaction to formβ-sialon whiskers in the matrix of mullite-SiC composite refractories. The erosion-wear resistance of mullite-SiC composite refractories was improved with the increase of silicon powder addition and erosion temperature, and the minimum volume erosion rate was under the condition of 12% silicon added and a temperature of 1400°C. The major erosion-wear mechanisms of mullite-SiC composite refractories were brittle erosion at the erosion temperature from room temperature to 1000°C and then plastic deformation from 1200°C to 1400°C.

Effect of Alloying Elements on the Corrosion Wear Behaviors of Low Chromium Cast Iron

2011 ◽  
Vol 695 ◽  
pp. 397-400
Author(s):  
Ru Qing Huang ◽  
Ri Lai Ma ◽  
Zhen Lin Lu ◽  
Yan Zhang
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Wear Mechanism ◽  
Alloying Elements ◽  
Corrosion Wear ◽  
Wear Properties ◽  
Micro Cutting ◽  
Three Body ◽  
Chromium Cast Iron ◽  
Effect Of Alloying

The effect of alloying elements on the corrosion wear behaviors of low chromium cast iron in slurry with different ions was studied by self-made three-body corrosion wear tester. The results show that the corrosion wear resistance of low chromium cast iron was decreased with the increase of concentration of Cu2+ ion or SO42- ion in slurry. The corrosion wear mechanism of low chromium cast iron was dominated by micro-cutting of abrasive, accompanying by corrosion action. The addition of alloying elements did not improve the corrosion wear properties of low chromium cast iron obviously, because the amount of carbide and its hardness was decreased when the alloying elements were added into low chromium cast iron as well as the amount of silicon element was increased.

Microstructure and Wear Properties of TiC/7075 Composites by In Situ Reaction Liquidus Curve Casting Method

2011 ◽  
Vol 675-677 ◽  
pp. 1121-1124 ◽  
Author(s):  
Ping Xu ◽  
Feng Wang ◽  
Hui Min Liu ◽  
Xiang Dong Liu
Keyword(s):  
Wear Resistance ◽  
Wear Mechanism ◽  
Matrix Alloy ◽  
Liquidus Curve ◽  
Sem Analysis ◽  
Wear Properties ◽  
Casting Method ◽  
Low Load ◽  
Cast Microstructure

7075 matrix alloy was fabricated by in-situ reaction liquidus curve casting method, and its as-cast microstructure was analyzed, the wear properties of these composites and matrix alloy were studied under the different conditions. The results show that the wear resistance of TiC/7075 composites is superior to 7075 matrix alloy in the same conditions (with same load or rotating velocity). Because of introduction of particle reinforcements, the wear resistance of the composite is enhanced by 1.5～4 times than that of its matrix. In addition, the wear mass loss of TiC/7075 composites increases almost with increase of load, but decreases with increase of rotating velocity. The wear resistance of the composites increases slightly at low load and high rotating velocity. The SEM analysis of the worn-out surface indicates that the wear mechanism of TiC/7075 composites is mainly abrasive wear.

scholarly journals Repetitive Impact Wear Behaviors of the Tempered 25Cr3Mo2NiWV Fe-Based Steel

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 107
Author(s):  
Cheng Zhang ◽  
Pu Li ◽  
Hui Dong ◽  
Dongliang Jin ◽  
Jinfeng Huang ◽  
...  
Keyword(s):  
Cross Sections ◽  
Wear Mechanism ◽  
Optical Microscope ◽  
Impact Wear ◽  
Wear Properties ◽  
Micro Cracks ◽  
The Cross ◽  
Repetitive Impact ◽  
Surface Morphologies ◽  
The Impact

This study aimed to reveal the impact wear behaviors of tempered 25Cr3Mo2NiWV steel. The specimens were subject to various heat treatment processes for generating different mechanical and wear properties. The impact wear tests were performed with an MLD-10 dynamic abrasive wear tester. Worn surface morphologies and micro-cracks of the cross-sections were analyzed by optical microscope and scanning electron microscope. The Vickers hardness of the sample and the impact wear mechanism were also analyzed. The steel with the best combination of hardness and toughness had the lowest wear. With the increase of wear time, the dominant wear mechanism varied from slight plastic deformation to micro-cutting and adhesive wear. Finally, micro fatigue peeling occurred. After impact wear, the cracks could initiate from the surface or the sub-surface. Micrographs of the crack in the cross-section demonstrated two different propagation modes of fatigue fractures. The results showed that the strength and toughness of steel affected the crack propagation, surface spalling, and wear failure mechanism during impact wear.

Study on Erosion Wear Property of Nickel-Chromium Cast Iron

2011 ◽  
Vol 117-119 ◽  
pp. 1084-1087
Author(s):  
Jing Pei Xie ◽  
Ai Qin Wang ◽  
Wen Yan Wang ◽  
Luo Li Li
Keyword(s):  
Cast Iron ◽  
Strong Acid ◽  
Impact Angle ◽  
Wear Loss ◽  
Test Machine ◽  
Wear Property ◽  
Erosion Wear ◽  
Nickel Chromium ◽  
The Impact ◽  
Chromium Cast Iron

Erosion wear experiments on Nickel-Chromium cast iron were tested by MCF-30 erosion test machine. The structure and surface morphology of these samples were analyzed by Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM) and XRD. The influences of the impact angle and acidity on erosion wear property were analyzed. The discipline of the erosion wear property was discussed as well. The experimental results indicate that after oil quench at 960°C and temper at 250°C, the alloy carbide (Fe, Cr)3C which works as the wear resistance skeleton distributes uniformly in the matrix ; the shape of erosion wear curve is “M”. and the biggest wear loss is when the impact angle is 60°; the erosion wear property is affected greatly by the strong acid, but is little even can be ignored when pH≥3. The erosion wear mechanism of Nickel-Chromium cast iron is selective wear.

Study on Erosion Wear Property of Nickel-Chromium Cast Iron

2013 ◽  
Vol 575-576 ◽  
pp. 535-538
Author(s):  
Jing Pei Xie ◽  
Li Jun Zhang ◽  
Ai Qin Wang ◽  
Xing Hai Shao
Keyword(s):  
Cast Iron ◽  
Wear Behavior ◽  
Strong Acid ◽  
Impact Angle ◽  
Homogeneous Distribution ◽  
Test Machine ◽  
Wear Property ◽  
Erosion Wear ◽  
The Matrix ◽  
The Impact

The influences of the impact angle and the corrosive agent acidity on low-chromium and nickel contained cast iron were studied in the behavior of erosion wear. The wear rule was summarized and the mechanics of the erosion wear behavior were analyzed in this thesis. Erosion wear experiments were carried on MCF-30 erosion test machine, and then the structure and surface morphology of the samples were analyzed by Scanning Electron Microscopy (SEM). The results showed that the alloy carbide (Fe, Cr)3C was generated by a kind of reticulate distribution in the matrix after oil quench at 960°C and temper at 250°C. The continuous and homogeneous distribution, just like the skeleton of the material, enhanced the wear resistance. The shape of erosion wear curve was M at different impact angles. The biggest wear rate occurred at a 60-degree impact angle. The erosion wear property was greatly affected by the strong acid, but it can be ignored when pH3.

scholarly journals Studies on structural, mechanical and erosive wear properties of ZA-27 alloy-based micro-nanocomposites

2021 ◽  
pp. 146442072199487
Author(s):  
Aleksandar Vencl ◽  
Mara Kandeva ◽  
Elena Zadorozhnaya ◽  
Petr Svoboda ◽  
Michal Michalec ◽  
...  
Keyword(s):  
Particle Size ◽  
Wear Resistance ◽  
Erosive Wear ◽  
Impact Angle ◽  
Wear Testing ◽  
Zinc Alloy ◽  
Wear Properties ◽  
Metal Matrix Nanocomposites ◽  
New Class ◽  
Alloy Base

Metal matrix nanocomposites represent a relatively new class of material, which is still being extensively investigated. Most of the studies, however, are devoted to aluminium- or magnesium-based nanocomposites. A limited number of studies focus on zinc alloy base nanocomposites, with fewer still concentrating on zinc alloy base micro-nanocomposites. In addition, most of the tribological studies investigate adhesive or abrasive wear resistance, whereas studies of erosive wear resistance lag well behind. It was previously shown that the presence of nanoparticles in ZA-27 alloy-based nanocomposites led to a slight increase in erosive wear resistance. Upon discovering that, the aim became to produce micro-nanocomposites that would retain the positive effect of nanoparticles, while further elevating performance, by combining microparticles with nanoparticles. The ZA-27 alloy-based micro-nanocomposites were reinforced with 3 wt. % Al2O3 microparticles (particle size approx. 36 μm) and with four different amounts (0.3, 0.5, 0.7 and 1 wt. %) of Al2O3 nanoparticles (particle size 20–30 nm). Tested materials were produced by the compocasting process, with mechanical alloying pre-processing. Solid particle erosive wear testing, with particle impact angle of 90°, showed that all micro-nanocomposites had significantly increased wear resistance in comparison to the reference material.

INFLUENCE OF THE IMPACT ANGLE OF A SOLID PARTICLE JET ON THE EROSION WEAR OF 38GSA AND HARDOX 500 STEEL

Tribologia ◽  
2017 ◽  
Vol 273 (3) ◽  
pp. 85-90 ◽  
Author(s):  
Bazyli KRUPICZ ◽  
Wojciech TARASIUK ◽  
Jerzy NAPIÓRKOWSKI ◽  
Krzysztof LIGIER
Keyword(s):  
Mechanical Properties ◽  
Kinetic Energy ◽  
Solid Particle ◽  
Quartz Sand ◽  
Impact Angle ◽  
Erosion Wear ◽  
Sand Particles ◽  
Work Of Deformation ◽  
The Impact

The paper investigated the influence of the impact angle of a solid particle jet on the erosion wear of 38GSA and Hardox 500 steel. The basis of the analysis was the assumption of the existence of a correlation between mechanical properties of the material, represented by the work of deformation (P) determined from the stressstrain diagram (U). The impact angle of quartz sand particles (30, 60, and 90 °) was considered through the separation of kinetic energy of particles impacting the eroded surface perpendicularly and tangentially.

Influence of Carbon Content in Cobalt-Based Superalloys on Mechanical and Wear Properties

2004 ◽  
Vol 126 (2) ◽  
pp. 204-212 ◽  
Author(s):  
Rong Liu ◽  
Matthew X. Yao ◽  
Xijia Wu
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Carbon Content ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Pin On Disc ◽  
Rotating Bending ◽  
The Impact

Two cobalt-based superalloys containing 1.6% and 2% carbon respectively were studied, with the emphasis on the influence of the carbon content on their microstructures, wear resistance, and mechanical properties. Phase formation and transformation in the microstructures were analyzed using metallographic, X-ray diffraction, and differential scanning calorimetry techniques. Wear resistance, tensile and fatigue behaviors of the alloys were investigated on a pin-on-disc tribometer, MTS machine and rotating-bending machine, respectively. It is found that the wear resistance was increased significantly with the carbon content. The mechanical properties of the alloys are also influenced by the carbon content, but the impact is not so significant as on the wear resistance. It was observed that the carbon content increased the yielding strength and fatigue strength, but decreased the fracture stress and fracture strain.

scholarly journals Utilization of Waste Marble Dust in Poly(Lactic Acid)-Based Biocomposites: Mechanical, Thermal and Wear Properties

2021 ◽  
Author(s):  
László Lendvai ◽  
Tej Singh ◽  
Gusztáv Fekete ◽  
Amar Patnaik ◽  
Gábor Dogossy
Keyword(s):  
Wear Resistance ◽  
Lactic Acid ◽  
Flexural Modulus ◽  
Production Costs ◽  
Poly Lactic Acid ◽  
Wear Properties ◽  
Dsc Measurements ◽  
Chain Mobility ◽  
Marble Dust ◽  
The Impact

AbstractThe aim of this present work was to study the applicability of waste marble dust (MD) in poly(lactic acid) (PLA)-based composites. Samples containing up to 20 wt% waste MD were prepared via melt blending. The attention was focused on the investigation of mechanical, morphological, thermal properties and the wear resistance of the PLA/MD composites. Regarding the mechanical properties, both the tensile and the flexural modulus improved remarkably, however, a slight loss was observed in strength and deformability. The impact toughness showed an increasing tendency up to 10 wt% MD loading, which was followed by a marginal decrease at higher concentration. With respect to the sliding wear rate, the composite with the highest MD content showed the best wear resistance. According to the DSC measurements, the MD hampered the chain mobility of PLA, thereby reducing the crystalline ratio. Overall, composites with improved properties were developed, while the reuse of waste MD is expected to reduce the production costs as well.

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