scholarly journals Treatment of Turbine Blades via Cr2O3-Ni5%Al System Using Plasma Thermal Spraying

2021 ◽  
pp. 1-5
Author(s):  
Esraa Mouhson ◽  
Sufian Humeedi ◽  
Salih Darweesh ◽  
Adnan Ahmed
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Adhesion Force ◽  
Turbine Blades ◽  
Thermal Spraying ◽  
Hardness Test ◽  
Reinforcement Rate ◽  
Final Thickness ◽  
A Value ◽  
Scanning Electron

A plasma thermal spraying method was used for the purpose of coating the pre-prepared surfaces of turbine blades. Chromium oxide (Cr2O3) was used as a matrix reinforced with a metal material of Ni-5%Al at rates of 10, 20, 30, 40 and 50. The cermet powders were stirred for one hour then used to coat bases of steel (316L). A spray distance of 8cm was applied, and the binding material of Ni-22%Cr-10%Al-1%Y was sprayed with a thickness of 100μm. Then, the reinforced matrix was sprayed with a thickness of 300–350μm and the final thickness of the samples prepared was 400–450μm. The samples produced were sintered at 900°C for an hour and a half and underwent a hardness test, which gave the best hardness of the samples after sintering at a reinforcement rate of 50% by 612Hv. The lowest porosity value for the above rate was obtained at 3.88%. The results of the adhesive strength gave a value of 31.5 MPa after sintering and at the same 50% reinforcement. The results of the scanning electron microscope (SEM) showed that there was weakness and cracking in the coating layers at the low reinforcement ratios. However, the mechanical and physical properties improved with the increase in reinforcement ratios to reach the highest value of 50%. KEYWORDS Adhesion force, ceramites, scanning electron microscope, Vickers hardness

CHARACTERISATION OF BIOMEDICAL TITANIUM LAYERS DEPOSITED BY A VACUUM PLASMA SPRAY PROCESS

2021 ◽  
Vol 55 (2) ◽  
pp. 231-235
Author(s):  
Mihailo Mrdak ◽  
Darko Bajić ◽  
Darko Veljić ◽  
Marko Rakin
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Hardness Test ◽  
Optical Microscope ◽  
Mechanical Tests ◽  
Test Method ◽  
Bonding Layer ◽  
Vacuum Plasma Spray ◽  
Porous Ti ◽  
Scanning Electron

In this paper we will describe the process of the deposition of thick layers of VPS-Ti coating, which is used as a bonding layer for the upper porous Ti coatings on implant substrates. In order to deposit the powder, we used HÖGANÄS Ti powder labelled as AMPERIT 154.086 -63 µm. In order to test the mechanical properties and microstructure of the VPS-Ti coating, the powder was deposited on Č.4171 (X15Cr13 EN10027) steel substrates. Mechanical tests of the microhardness of the coating were performed by the Vickers hardness test method (HV0.3) and tensile strength by measuring the force per unit area (MPa). The microhardness of the coating is 159 HV0.3, which is consistent with the microstructure. The coating was found to have a good bond strength of 68 MPa. The morphology of the powder particles was examined on a scanning electron microscope. The microstructure of the coating, both when deposited and etched, was examined with an optical microscope and a scanning electron microscope. By etching the coating layers, it was found that the structure is homogeneous and that it consists of a mixture of low-temperature and high-temperature titanium phases (α-Ti + β-Ti). Our tests have shown that the deposited layers of Ti coating can be used as a bonding layer for porous Ti coatings in the production of implants.

scholarly journals Pengaruh Kombinasi Terhadap Kekuatan Material Golok Sulangkar Campuran 10% Pegas 90% Baja SS 400

2021 ◽  
Vol 14 (1) ◽  
pp. 27-32
Author(s):  
Dedi Komarudin
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Impact Test ◽  
Hardness Test ◽  
Forging Process ◽  
Steel Material ◽  
The Impact ◽  
The Village ◽  
Over Time ◽  
Scanning Electron

The manufacture of tools such as machetes in Banten is still widely practiced, machetes are produced from a conventional forging process using a hammer by a blacksmith. Working as a blacksmith in the Banten area, especially in the village of the new village of lightning, was passed down from generation to generation as a traditional blacksmith, but over time the machetes produced by traditional blacksmiths began to be replaced by modern ones machete. The traditional golok of Kampung Baru Village, Petir, consists of two types, the regular machete and the sulangkar golok. The material commonly used by blacksmiths to make machetes is a vehicle spring sheet that is no longer used, while for making machetes, a blacksmith usually combines other materials during forging. The purpose of this study was to determine the differences in the mechanical and micro properties of the two types of golok, Banten cultural heritage. The research was carried out from the start of the search for the material, the manufacturing and forging processes and carried out testing. The results of the hardness test show that the value of the spring material is 423.1 HBW, SS 400 steel material 134.18 HBW, combination material or Sulangkar 735.15 HBW then the data results from the tensile test on steel material SS 400, Spring, Combination or Sulangkar are 442.52 MPa, 1334,60 MPa, 522.81 MPa. The results of the data from the impact test on Spring material, SS 400 steel, Combination or Sulangkar, namely 162 J, 34 J, 88 J. The results of automatic microscope testing and Scanning Electron Microscope (SEM) show the surface of the spring, SS 400 steel and combination materials.

Adhesion force measurement system for micro-objects in a scanning electron microscope

2000 ◽  
Vol 71 (8) ◽  
pp. 3123-3131 ◽  
Author(s):  
Hideki T. Miyazaki ◽  
Yasushi Tomizawa ◽  
Koichi Koyano ◽  
Tomomasa Sato ◽  
Norio Shinya
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Measurement System ◽  
Adhesion Force ◽  
Force Measurement ◽  
Force Measurement System ◽  
Scanning Electron

The Influence of Holmium on the Microstructure and Hardness of Mg-Nd-Gd-Zn-Zr Alloys

2017 ◽  
Vol 740 ◽  
pp. 48-53 ◽  
Author(s):  
Rosli Ahmad ◽  
N.R. Shahizan ◽  
M.B.A. Asmael ◽  
Ashraf M.M. Elaswad
Keyword(s):  
Grain Size ◽  
Rare Earth ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Vickers Hardness ◽  
Volume Fraction ◽  
Hardness Test ◽  
Vickers Hardness Test ◽  
Scanning Electron ◽  
Zr Alloys

The influence of holmium on the microstructure and hardness of Mg-Nd-Gd-Zn-Zr alloys were investigated. Conventional casting methods are used to produce the alloys. All the results were characterized by optical microscopy, scanning electron microscope (SEM) and the Vickers hardness test to highlight the influence of holmium addition. The addition of 2.0 wt.% holmium leads to the combination of rare earth elements which formed Mg-Zn-Nd-Ho phase. The results have shown the addition of Ho improved the microstructure and hardness of Mg-Nd-Gd-Zn-Zr alloys. By adding grain size of 2.0 wt.% holmium had reduced by 18.43%, while the volume fraction increased by 7.34%. The Vickers hardness value improved 6.18% due to the grain refine and volume fraction precipitates. The 2.0 wt.% holmium addition showed a positive result in microstructure and hardness value.

Cracking Failure Analysis of Cr12MoV Steel Guide Roller

2014 ◽  
Vol 1033-1034 ◽  
pp. 818-823
Author(s):  
Yuan Li ◽  
Gang Yang ◽  
Yi Yang ◽  
Yi Chen ◽  
Shu Lin Huang
Keyword(s):  
Electron Microscope ◽  
Energy Spectrum ◽  
Scanning Electron Microscope ◽  
Failure Analysis ◽  
Hardness Test ◽  
Metallographic Analysis ◽  
Casting Defects ◽  
Guide Roller ◽  
Macroscopic Observation ◽  
Scanning Electron

A failure case of the Cr12MoV steel guide roller is presented in this paper. Many net cracks were distributed on the surface and both ends of guide roller had been oxidized to black seriously. The failure analysis was performed in terms of macroscopic observation, fracture scanning electron microscope (SEM), energy spectrum, metallographic analysis and hardness test, etc. The results show that a large number of casting defects, such as holes and inclusions, exist inside of the guide roller, which could be considered as crack source under the effect of alternating load; and then the crack source constantly grows and expands along the vulnerable region-grain boundary when the guide roller bears cold and hot effects repeatedly, resulting in large stress existing on the surface; finally fatigue intergranular cracks are formed which lead to guide roller cracking failure.

The Effects of Ausforming on the Precipitating Process and Mechanical Properties of 17-4PH Stainless Steel

2010 ◽  
Author(s):  
M. Amirkamali ◽  
M. Aghaie-Khafri
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Hardness Test ◽  
Salt Bath ◽  
Solution Treated ◽  
Microstructural Studies ◽  
Scanning Electron ◽  
Bath Furnace

In this study, the effects of ausforming on the precipitating process and mechanical properties of 17-4PH stainless steel were investigated. For doing ausforming, samples were solution treated at 1050°C for an hour, and then quenched into a salt bath furnace at 400°C. Rolling at 400°C in different percents was done for achieving different mechanical works. After finishing ausforming process, samples were tempered for precipitating at 300,400,500 and 600°C for 1, 2, 4, 8, 16 and 32h. Microstructural studies were done for finding the changes on precipitating process and tensile and hardness test done to study mechanical properties. Scanning electron microscope was used to show precipitates and other phases. Also EDS method used to analyze the elements in each phases.

scholarly journals The Effect Of Strain Rate On The Mechanical Properties And Microstructure Of The High-Mn Steel After Dynamic Deformation Tests

2015 ◽  
Vol 60 (2) ◽  
pp. 577-580 ◽  
Author(s):  
M.B. Jabłońska ◽  
A. Śmiglewicz ◽  
G. Niewielski
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Dynamic Deformation ◽  
Hardness Test ◽  
Tensile Tests ◽  
Mechanical Twinning ◽  
Test Method ◽  
Static Tensile ◽  
Scanning Electron

AbstractThe paper presents results of dynamic tensile investigations of high-manganese Fe – 20 wt.% Mn – 3 wt.% Al – 3 wt.% Si – 0.2 wt.% steel. The research was carried out on a flywheel machine, which enables to perform dynamic tensile tests and impact bending with a linear velocity of the enforcing element in the range of 5÷40 m/s. It was found that the studied steel was characterized by very good mechanical properties. Strength of the tested materials was determined in the static tensile test and dynamic deformation test, while its hardness was measured with the Vickers hardness test method. The surface of fractures that were created in the areas where the sample was torn were analyzed. These fractures indicate the presence of transcrystalline ductile fractures. Fractographic tests were performed with the use of a scanning electron microscope. The structure was analyzed by light optical microscopy. Substructure studies revealed occurrence of mechanical twinning induced by high strain rates. A detailed analysis of the structure was performed with the use of a transmission scanning electron microscope STEM.

scholarly journals The Use of Mercury against Pediculosis in the Renaissance: The Case of Ferdinand II of Aragon, King of Naples, 1467–96

2011 ◽  
Vol 55 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Gino Fornaciari ◽  
Silvia Marinozzi ◽  
Valentina Gazzaniga ◽  
Valentina Giuffra ◽  
Malayka Samantha Picchi ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
History Of Medicine ◽  
Contemporary Literature ◽  
A Value ◽  
Hair Samples ◽  
History Of ◽  
Medical Therapies ◽  
Scanning Electron ◽  
Indirect Sources

The hair samples of Ferdinand II of Aragon (1467–1496), King of Naples, whose mummy is preserved in the Basilica of San Domenico Maggiore in Naples, showed a high content of mercury, with a value of 827ppm. Furthermore, examination using a stereomicroscope and a scanning electron microscope (SEM) of head and pubic hairs of Ferdinand II, revealed a lice infestation. The reasons for the massive presence of the mercury in the king's hair are discussed and contemporary literature regarding the use of this metal in medical therapies and in cosmetic practices is analysed. As a result, the high value of mercury in the hair of Ferdinand II can be attributed to antipediculosis therapy, applied as a topic medicament. This case represents an important finding for the history of medicine, because demonstrates that in the Renaissance mercury was applied locally not only to treat syphilis, as well attested by direct and indirect sources, but also to prevent or eliminate lice infestation.

The Alteration of the Pore Spaces in Sandstones

1973 ◽  
Vol 31 ◽  
pp. 210-211
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Coarse Grained ◽  
Depositional Fabric ◽  
Soluble Components ◽  
Scanning Electron ◽  
Shape And Size

The pore spaces in sandstones are the result of the original depositional fabric and the degree of post-depositional alteration that the rock has experienced. The largest pore volumes are present in coarse-grained, well-sorted materials with high sphericity. The chief mechanisms which alter the shape and size of the pores are precipitation of cementing agents and the dissolution of soluble components. Each process may operate alone or in combination with the other, or there may be several generations of cementation and solution.The scanning electron microscope has ‘been used in this study to reveal the morphology of the pore spaces in a variety of moderate porosity, orthoquartzites.

The Broad Applications of the Scanning Electron Microscope

1969 ◽  
Vol 27 ◽  
pp. 20-21
Author(s):  
C. T. Nightingale ◽  
S. E. Summers ◽  
T. P. Turnbull
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscopy ◽  
Surface Topography ◽  
Great Depth ◽  
Resolving Power ◽  
Depth Of Field ◽  
Pictorial Representations ◽  
Scanning Electron

The ease of operation of the scanning electron microscope has insured its wide application in medicine and industry. The micrographs are pictorial representations of surface topography obtained directly from the specimen. The need to replicate is eliminated. The great depth of field and the high resolving power provide far more information than light microscopy.

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