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Online since: December 2011
Authors: Shu Huan Wang, Cui Liang Wang, Ding Guo Zhao, Ju Gao
Introduction High nitrogen steel has good toughness, uniform corrosion resistance, local corrosion resistance [1-3] and excellent mechanical property [4].
Temperature is one of the important factor for the reaction process rate, whose increase can enhance the reaction rate and diffusion coefficient.
Compared with other factors, the increase of the temperature has little effect on the increaseing of the nitrogen content in steel.
Although the temperature on the nitrogen content in steel is not significant affected, but it is the important kinetic and thermodynamic parameter in smelting process and should make further experiment and research[10].
Analysis of high nitrogen steels refining factors with high pressure and bottom-blowing nitrogen.
Online since: May 2011
Authors: Qing Wen Ren, Hai Wei, Jun Cai Xu
The problem of concrete cracks is one key difficulty for concrete construction, because concrete cracking affects not only the overall aspect but also the service period adaptability, and can even damage the structural safety degree.
Many factors are taken into account during the structural thermal control including construction schedule, concrete properties, temperature measurement, construction climatic conditions etc [5].
As many construction conditions including construction schedule, concrete properties etc, are changed, these factors will have an effect on the thermal control.
Multi-point temperature survey unit sends thermal data to control center after the acquisition of thermal data, then control center inverses the concrete thermal and mechanical parameters on basis of received thermal data.
If the comparison is less than safety factor, then it continues executing from beginning step again until computing reaches ending day to terminate the whole work.
Online since: April 2016
Authors: Maciej Motyka, Jan Sieniawski, Waldemar Ziaja
Therefore it was assumed that martensitic transformation β→α’(α”) during water quenching preceding plastic working in TMP affects grain refinement efficiency during plastic deformation.
Water quenching preceding forging in TMP causes increase of deformed αE grain elongation factors – from fα = 2,1 – without quenching – to 3,6 and 6,8 after α+β↔β and β range quenching respectively (Fig. 2d-e).
Maximum elongation factor fα was achieved for in hot forging after β quenching (fα 6,8).
Picu, Mechanical behavior of Ti-6Al-4V at high and moderate temperatures – Part I: Experimental Results, Mat.
Bhole, Effect of heat treatment on mechanical properties of Ti–6Al–4V ELI alloy, Mat.
Online since: April 2009
Authors: J. Balmain, B. Bouchaud, Fernando Pedraza-Diaz
Therefore, buckles as well as sharp precipitates may disrupt the refractory element outward flows and favor an asymmetrical front of diffusion, which in turn may strongly modify the bulk mechanical properties of the coating, see also [6].
In our case, despite the associated volumetric change has not been clearly identified as a contributing factor to surface rumpling, the phase transformation reactions (L10 � B2 à L12) seem to affect the thermal stability of the coating.
On the contrary, as the martensitic transformation had not been observed on isothermally oxidized specimens, the likely effect to originate surface rumpling seems to come mainly from the additive layer properties.
Indeed, the Cr segregation at the grainboundary is known to improve the creep properties of the grain of the coating by local chemical changes.
In contrast, upon isothermal exposure the influence of α-Cr segregation as well as oxide pegs on the creep properties of both the aluminide coatings and the TGO leads to a more even and less rough surface.
Online since: January 2010
Authors: Ileao L. Ferreira, D.J. Moutinho, L.G. Gomes, O.L. Rocha, Pedro R. Goulart, Amauri Garcia
Garcia 3,f 1 Fluminense Federal University, Department of Mechanical Engineering.
Fine dendritic microstructures in castings, characterized by the dendrite arm spacing are recognized to yield superior mechanical properties if compared to coarser ones.
Much research has been devoted to the definition of the factors affecting the fineness of the dendritic structure.
The thermophysical properties of this alloy were determined by the ThermoCalc software, with the exception of thermal conductivities [17].
Thermophysical properties of the Al-6wt%Cu-1wt%Si alloy used in the numerical simulation Properties Units Al-6wt%Cu-1wt%Si Liquidus temperature - TL °C 638 Initial Eutectic Temperature TEI oC 530.2 Final Eutectic Temperature - TEE °C 527.6 Silicon Transformation Temperature - TSi °C 513.2 Fusion temperature - TF °C 660 Thermal conductivity (solid) - kS W.m -1.K-1 180 Thermal conductivity (liquid) - kL W.m -1.K-1 87.9 Density (solid) - ρS kg.m-3 2713.4 Density (liquid) - ρL kg.m-3 2529.5 Specific heat (solid) - cS J.kg -1.K-1 1063 Specific heat (Liquid) - cL J.kg -1.K-1 1125 Latent heat of fusion - ∆H1 at 638 ≤ T < 530.25 oC J.kg -1 289600 Latent heat of fusion - ∆H2 at 530.25 ≤ T < 527.54 oC J.kg -1 15800 Latent heat of fusion - ∆Heut at T = 527.55 oC J.kg -1 57200 Liquidus slope - Cu Lm °C.
Online since: September 2023
Authors: Ronald Allan S. delos Reyes, Jonah Alyssa Montuya, Danah Patrice Higa, Niera Umantod
Introduction Eggshell powder, having cementitious properties due to the presence of calcium oxide, have been investigated by researchers as a possible material of construction [1,2,3].
Their observations have shown that PET-ash composite tiles can be a viable option in terms of the desired properties.
The tiles were then left to dry for 72 hours before mechanical strength testing.
Yield % vs. the proposed Interstitial Dynamic Spacing – IDS As can be deduced, the mode of breakage (impact, chipping or attrition) is influenced by a number of factors.
After the curing period, the tiles were tested for its mechanical strength shown in Fig. 4.
Online since: November 2011
Authors: Uwe Erb, G. Cingara, S. Wang, I. Brooks, G. Palumbo, J.L. McCrea
Introduction Due to the many desired physical, chemical and mechanical properties that nanocrystalline materials have displayed in numerous investigations, there is continued interest in studying these materials in great depth.
The greatest benefit of studying fully dense nanocrystalline metals is that one is able to characterize the sole effects of grain size and impurities on the properties without contributions from other defects such as porosity.
This phenomenon has been studied extensively to understand properties of nanocrystalline materials.
A comprehensive study by McCrea et al. has shown that the electrical resistivity in nanocrystalline nickel is strongly affected by grain size when it decreases below 100 nm [11].
Rose: The Structure and Properties of Materials (John Wiley & Sons, New York 1966).
Online since: July 2015
Authors: I. Nyoman Gde Antara, K.I. Made Gatot, I. Made Budiana, Dae Kue Choi
Introduction The superior properties of titanium and its alloys on account of their good mechanical properties, excellent corrosion resistant, biocompatibility and relatively low density have been well known to be potentially very excellent metallic alloys for bioimplant applications.
However, like most metals, titanium and its alloys exhibit poor osteoinductive properties because of their bioinert feature [1].
The characteristics of deposited TiO2 oxide film on the surface of biomaterial implant are mostly affected by the electrolyte solution, the electrical potential difference imposed between cathode and anode and the current imposed to reach the value of potential difference during the fabrication of deposition. [5-7].
Sun et al. reported that applied voltage and processing time are important factors to prepare hydroxyapatite at a higher voltage of the anodic process (micro-arc-oxidation) [14].
The increase CA molarity affected the appearance of the precipitated Ca-P crystals on the surface of hydrothermally treated specimens.
Online since: September 2013
Authors: Radim Čajka, Kamil Burkovič, Vojtech Buchta, Roman Fojtík
One of the significant factors is also climatic changeability.
The other factor is that there was only one tile tested and it is necessary to test more specimens for getting the needy statistical data [7], [11].
FR-TI2/746 “Rheological sliding joint with thermo-controlled viscoelastic properties” and partially by the project “Conceptual development of science and research activities 2013” on the Faculty of Civil Engineering, VSB-TU Ostrava.
Manasek: Finite Element Analysis of a Structure with a Sliding Joint Affected by Deformation Loading, in B.H.V.
International Conference Geomechanics 93, Strata Mechanics/Numerical Methods/Water Jet Cutting/Mechanical Rock Disintegration, Pages 233-236, Ostrava, Czech Republic, Sep 28-30, (1994) [10] P.
Online since: October 2014
Authors: Pei Zhi Yu, Ji Yuan Wu, Xiao Lin Qian
So it is not easily affected by metal ions and mechanical shear degradation of reservoir.
Results and discussion The influence of polycondensation monomer molar ratio on the properties of crosslinking agent.
Formaldehyde as the hydroxymethylation reagent of phenol, its content is an important factor in determining hydroxymethylation degree which is closely related to the performance of weak gel [10].
Reaction temperature and time are the important factors to polycondensation.
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