On The Microhardness Of Chemical Elements
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CHARACTERISATION OF NIOBIUM CARBIDE COATING OBTAINED BY
mapping was also performed to identify the chemical elements in a semi-quantitative analysis. Dron X-ray diffractometer with Mo Kα radiation operating was used for phase(s) identification. KEYWORDS: thickness, NPCVD, widia, layers, interface, microhardness, pressure. 1. Introduction The vapour chemical deposition is a widely
Valorization of industrial wastes for the production of glass
Lokris, Greece.Table 1 shows the chemical analysis of the raw materials in the foused rm of oxides and trace elements, as derived from anX-Ray fluorescence energy dispersive spec-EDS) trometer (XRF Bruker-AXS S2 Range Type.Loss on ignition (LOI) was determined by heating raw materials at 1050 o. C for 4h.
772. A study of selected properties in high dispersion
Keywords: acid resistant steel, powder nanowire, laser padding weld, microstructure, chemical composition, microhardness. Introduction In industry, there is an increased intensity to search for modern solutions to reduce wear and produce more efficient regeneration of the elements of machines. Most of wear processes begin on the surface of a
Fastener & Material Testing Johnson Space Center
thickness, and qualitative chemical analysis of elements during investigations. OPTICAL EMISSION SPECTROSCOPY Verifies the chemical composition of metals. This can be critical in ensuring that the correct alloy is being implemented in the design application for which it is intended. BEND TEST Determine the relative ductility of metal that is to be
INFLUENCE OF THE MICROSTRUCTURE ON MACHINING A CENTRAL
of microhardness, chemical analyses and a microstruc-tural characterization of the castings were necessary. 3.2 Microhardness Microhardness measurements for one good and two bad castings were performed. Figure 2 shows the points of the microhardness measurements on individual castings. Points 1 6 (Figure 2a) on the good casting
Effect of the Chemical Homogeneity of a Quenched and Tempered
3.1 Chemical analysis Table 1 presents the steel chemical composition in the two analyzed regions highlighting the percentage changes in the contents of the elements in the position 2 sample in relation to the position 1 sample. It is observed that there is a trend of chemical segregation from the outermost part
Strengthening Aluminum by Zirconium and Chromium
Strengthening Aluminum by Zirconium and Chromium by Shi Yan A Thesis Submitted to the Faculty of the WORCESTER POLYTECHNIC INSTITUTE in partial fulfillment of the
The Influence of Exposure Energy Density on Porosity and
elements is based only on 3D computer-aided design (CAD) data. The metal powder is melted selectively layer by layer using an ytterbium laser. This paper contains the results of porosity and microhardness analysis made on specimens manufactured during a specially prepared process.
Microhardness of Ni-Cr alloys under different casting
elements alloyed with nickel, such as chromium, molybdenum, titanium and niobium1. The use of casting machines supplied with atmosphere control, such as the ones for titanium casting, can cover and protect the melt from oxida-tion and dissolution of other chemical elements, such as nitrogen and oxygen10,25. The dissolution
Influence of Laser Cladding Parameters on Microstructure
Aug 21, 2020 chemical elements may improve the mechanical properties. The B Si coatings were characterized by properties better than boron coatings and silicon coatings. The authors found that this kind of coating was characterized by microhardness in the range from 1430 to 1870 HV, as well as high wear and corrosion resistance.
Comparative Eﬀect of Rapid Dendrite Growth and Element
Diﬀerent undercooling ranges and solute elements change microstructures and in consequence yield very diﬀerent mechanical properties, as shown by the measured Vickers microhardness (H V) of the three Fe-based alloys in Figure 2. While the microhardness of Alloy 1 just slightly varied from H V 463 to 476 with a markedly increased
Composite Matrix Reinforced with Carbides for Hammers of
Chemical composition After obtaining the hammers by casting process, the chemical compositions o f the experimental metallic matrixes were determined by optical emission spectrometry and are presented in Table 1. Only the chemical elements from the matrix composition considered to have a significant influence on micro-hardness are mentioned.
Direct radiation-induced effects on dental hard tissue
Microhardness measurement Microhardness measurement was performed on a Vickers microhardness tester (Struers DuraScan-20, Ballerup, Denmark), with a 25-gf load applied for 10s in enamel and a 10-gf load for 15s in dentin. Four sites on the dental longitudinal section surface were chosen and measured for each dental slab in the three groups (Fig
EVALUATION OF MICROHARDNESS, EFFECTIVE STRESS AND RESIDUAL
number of elements (68,955) and accuracy of results, fig. 2. In particular, the mesh is made of elements 0.2 mm long in the regions where grooves are formed. Fig. 1. Form of the profile rolling Table 1. Chemical composition and initial microhardness of the steels Chemical composition (wt %) Materials C Si Mn Cr Ni Mo P, S Microhardness (average)
A Study on Microhardness, Microstructure and Wear Properties
3.1. Microhardness It is evident from Figures 4-6 that the hardness of weldmetal near FBZ is lower than that of the weld metal away from the FBZ indicating the effect of dilution. In ure 4Fig, the hardness adjacent to the interface is found Figure 3. Pin samples for wear tests. Figure 4. Microhardness distribution along various zones of PTA
t Component and Material Validation C - NASA
solder used on boards, plating thickness, and qualitative chemical analysis of elements during investigations. BEND TEST Determine the relative ductility of metal that is to be formed for the soundness and toughness of the metal. A u n i q u e f a c i l i t y M e c h a n i c al R I T El e c t ri ca l F TENSILE TESTING Test specimens are
Journal of Chemical and Pharmaceutical Research, 2016, 8(4
study the effect of beta rays dose on the physical properties (density), chemical properties (leaching rate) and mechanical properties (microhardness and surface strength). Chemical durability is an important technical performance property of waste forms in groundwater environments.
Analytical and Experimental Study of Laser Cladding of Ni/WC
analytical and experimental study of laser cladding of ni/wc metal matrix powders reinforced with rare earth elements using a high power direct diode laser
Determination of chemical elements and cross-section hardness
for chemical element by Energy Dispersive X-ray Spectroscopy and the other section evaluated on Knoop microhardness (KHN). Knoop Microhardness analysis Half of each crown was subjected to microhardness analysis in a FM-700-Tech Future equipment. Indentation parameters were set at 10 g load for 10 s .
Chemical Composition Influence on Microhardness
of the chemical elements on the microstructure, phases morphology and microhardness of AlxCrFeCoNi system was studied. The results have confirmed that mechanical properties could be greatly adjusted by the chemical composition change. The main element that influences the microhardness of the analyzed
Effect of different doses of radiation on morphogical
Results: Radiation caused a decrease in microhardness of enamel and dentin (p<0.05). In the elemental analysis by ICP-OES, it was observed that there were decreases in all elements after 60Gy compared to the control group ( p<0.05). In the experimental groups, amorphous structures were encountered in SEM images.
Microhardness and Surface Integrity in Turning Process of
The microhardness measurements were effected by Micro indentor Vickers Paar MHT-4, with 50 g of load, during 10 s for all the measurements. The Fig. 1 shows how the pieces were separated from the initial specimen to the microhardness measurements and microstructure analysis (from bar material to microhardness sample). After the cutting made in
THERMAL CYCLING INFLUENCE ON MICROSTRUCTURAL CHARACTERIZATION
Vickers microhardness (Figure 3) was determined after an electrolytic attack of as received conditions with Microhardness OPL. Figure 3 Vickers microhardness of as received alloys with high nickel content As received Inconel 617 has the highest microhardness and Incoloy 800HT has the largest grain size and the lowest microhardness.
NEURAL NETWORKS TO PREDICT MICROHARDNESS OF NAVAL STEEL BY
input parameters that cover the chemical composition and Charpy impact energy and output parameter which is microhardness. The networks was trained to predict the microhardness amounts as output.The artificial neural networs was developed and training using a back propagation algorithm applied to the experimental data from literature.
Dissimilar Materials Weldability Concepts
3 December 15, 2015 Dissimilar Materials Weldability Concepts Dr. Alber Sadek Technology Lead Materials Engineering EWI [email protected] 614.688.5125
Plasma surface treatment of Cu by nanosecond-pulse diffuse
Jun 02, 2017 surface morphology, chemical elements and microhardness of near-surface layers before and after the plasma treatment are analyzed. 2. Experimental setup and measurement system 2.1. Experimental setup All the experiments are carried out in ambient air. The schematic picture of the experimental setup is shown in ﬁgure 1.
Microhardness and Chemical Composition of Human Tooth
Vol. 6, No. 3, 2003 Microhardness and Chemical Composition of Human Tooth 369 from tables. The mean value and SD were calculated for both IL and VHN.
IOP Conference Series: Materials Science and Engineering
groups of the chemical elements of the periodic system, possess high hardness and yield to other elements in wear-resistant indices insignificantly. The use of refractory carbides, such as TiC, CrC, TaC, VC, MoC, NbC, as surfacing materials seems a more rational solution [5-12].
HETEROGENEITY OF INCONEL 713 LC AND INCONEL 738 LC
Under the measurements of chemical heterogeneity of both superalloys were found following facts: - Dendritic heterogeneity of elements of Inconel 738 LC sample as received i.e. cast state is approximately the lowest. Annealing at temperature 850oC increases a chemical heterogeneity of presented elements as Al, Ti, Cr, Co, Ni and Mo.
THE SURFACE MORFOLOGY INSIDE CAVITIES AFTER PLASMA NITRIDING
subsequently evaluated by metallographic, GDOES, XRD microanalysis and microhardness methods. The results of measurement showed trends of chemical composition of alloying elements after chemical-heat treated process through the length of cavity. Plasma nitriding process is applied for increasing of surface hardness of material in deep cavities.
MICROSTRUCTURE AND HARDNESS OF TWO MATERIALS FOR HAMMER OF MILLS
Keywords: steel casting, microstructure, hardness, microhardness, chemical composition 1. INTRODUCTION The material for hammer mills is cast high-manganese steel known as Hadfield steel. The most important elements in the Hadfield steel are carbon and manganese. Hatfield steel usually containing 1 to 1,5%C and 11 to 14%Mn.
CHARACTERIZATION OF THE EVOLUTION OF 2219-T87 ALUMINUM AS A
Property diagram of AA2219-T87 generated for maximum allowable chemical composition of all alloying elements. 25 Figure 3.2. Non-stressed isothermal microhardness results collected after 2.8 hours of
THE EFFECT OF THE pH VALUES AND SINTERING TEMPERATURES ON THE
sintering temperature and Ca:P ratio. The Vickers microhardness showed that the single-phase HA was the hardest one compared to the biphasic HA/β-TCP. It shows the optimal value of the Vickers microhardness for the single-phase HA with a pH 10 at 1000 °C is 4.15 MPa. INTRODUCTION Nowadays, the biomedical field is becoming an im-
SHAPING THE EDGES USING FLOWDRILL TECHNOLOGY
The main chemical elements of the used materials is presented in the Table 1. Table 1 Main chemical elements of used materials / wt % Material C Mn Si Cr Fe Ni Mg 4301 0,04 1,00 0,39 18,252 - 8,165 - S235JRH 0,10 0,43 0,21 0,04 - 0,01 - 6060 - ≤ 0,1 0,3 ÷ 0,6 ≤ 0,05 0,1 ÷ 0,3 - 0,35 ÷ 0,6 Hole drilling in the selected shapes was carried out
Microstructure and microhardness of SiC nanoparticles
Chemical composition of AZ91D magnesium alloy AZ91D Mass percentage Al 9.30 Zn 0.71 Mn 0.21 Si <0.10 Cu <0.030 Ni <0.005 Fe <0.002 Mg Balance Table 2 Chemical composition of nano-sized SiC particle-SiC Mass percentage SiC >=95% [O] 1 1.5% C 1 2% Average diameter 30nm Speciﬁc surface area >109.0M 2/g Synthesis technique Laser
MICROSTRUCTURE AND WEAR RESISTANCE OF THE LASER HARDENED PM
microhardness values ranged from 330 to 540 HV0.3 and case depth from 7.3 to 7.8 to find out the distribution of chemical elements in the specimen s cross-section.
Influence of the Chemical Composition on the Microstructure
Influence of the Chemical Composition on the Microstructure and Microhardness of AlCrFeCoNi High Entropy Alloy IONELIA VOICULESCU 1 , VICTOR GEANTA, RADU STEFANOIU*, DELIA PATROI 2 , HORIA BINCHICIU 3
Dental enamel bleached for a prolonged and excessive time
ated groups. However, the microhardness decreased in the G4 group. Scanning electron microscopy showed changes in the enamel surface of groups G2, G3 and G4. Dispersive X-ray spectroscopy identified changes in the concentration of chemical elements O, Mg, P, K in all groups. Thus, this study showed that prolonged home bleaching could cause
THE INFLUENCE OF BASELINE HARDNESS AND CHEMICAL COMPOSITION
mineral distribution, chemical composition and hardness.3,8 Several attempts have been made to correlate the baseline characteristics of enamel with its response to demineralization. Cuy et al. showed that the hardness of dental enamel has a strong correlation with its chemical content.9 Areas with higher
EFFECTS OF HEAT TREATMENTS ON THE MICROSTRUCTURE AND
chemical elements introduced in quasi-equiatomic percent, have outstanding features of hardness and toughness, being an interesting alternative for use as hardfacing by welding on components subjected to severe stress and abrasive wear. The paper shows the effect of heat treatments