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Online since: July 2020
Authors: Damian Janicki
Scheil solidification paths for Fe-3.6 wt% C-2.5 wt% Si-Ti alloy system with different Ti contents (wt%): (a) 11; (b) 12; (c) 13; (d) 14; (e) 15; (f) 16 The effect of Ti concentration in the molten pool on the number of precipitated phases in the ternary Fe-3.6 wt% C-Ti alloy system under metastable equilibrium condition is shown in figure 3b.
This change in the morphology of the γp dendrites is mainly attributed to a significantly higher thermal stability of the TiC phase than that of the austenite phase, which provides a heterogeneous nucleation of the primary austenite grains.
In such a case, the TiC is the first phase which precipitates from the liquid in the molten pool, and the resultant TiC particles act as nucleating agents for primary austenite grains formation.
Thus, the variation in the fraction of retained austenite with increasing traverse speed at constant HI level and titanium concentration in the molten pool, can be attributed to a change in carbon content in the primary austenite grains, caused by different cooling rates.
Because of its high thermal stability, the TiC phase promotes a heterogeneous nucleation of primary austenite grains, what reduces a cracking tendency of the TRLs.
Online since: May 2022
Authors: S. El-Sayed, S.A. Sayed, Marwa Hafez
The spectroscopic properties of RuDPC complex is seemed to be dependent on its characteristics to the effect of radiation (FTIR), as a solar material in the application of this field; due to DPC is a photosensitive material, so that there are a number of optical applications which depend upon optically induced structure transition energy states for the complex.
Ruthenium (Ru) is one of the chemical elements, it has atomic number of 44 and its electronic configuration is [Kr] 4d7 5s1.
The SEM image of RuDPC shows the distribution of particles within the agglomerated cluster throughout the surface with fine grained structure.
The rate change in the FTIR spectroscopic analysis through the formation of new complex (RuDPC), such as (band shape, transmittance, rotational energy barrier, relaxation time,…) is mainly related to the number of ions that tolerate different energy states.
That is supported the basic spectroscopic properties of the new complex (RuDPC) is seemed to be based on its characteristic to the effect of radiation (FTIR), as a solar material in the application of this field, due to DPC is a photosensitive material, and the formation of the delocalized energy state in the new complex (RuDPC), so that there are a number of optical applications which depend upon optically induced structure transition energy states for the (RuDPC) complex.
Online since: March 2024
Authors: Veerle Boel, Leo Van Cauter
In this paper, more than 20 mixtures of metakaolin/blast furnace slag alkali-activated mortar mixtures with a maximum grain size of 2.5 mm are investigated.
CO2 emissions from buildings operations have reached an all-time high of around 10 GtCO2, around a 5% increase from 2020 and 2% higher than the previous peak in 2019. [1] The world’s construction sector is contributing nearly 40% to global emissions, with the number of buildings being built increasing every passing year. [2] The production of each ton of cement releases up to 0.95 ton of CO2.
The naming of the mixtures includes the type of activator (S: sodium silicate solution; P: potassium silicate solution), the M.% of metakaolin in the precursor, and a numbering to distinguish between mixtures with different amount of water.
The strength results are checked on outliers according to the standard, and it is indicated with * in the tables in case the number of considered results had to be altered.
Conclusion The research presented in this paper investigated more than 20 mixtures of metakaolin/blast furnace slag alkali-activated mortars with a maximum grain size of 2.5 mm.
Online since: September 2011
Authors: Xiao Bin Chen, Jia Sheng Zhang
Introduction A number of rheological constitutive models have been proposed and soil visco-plastic model research works have been reported in several studies[1][2](KARMAKAR and SHARMA 2004, GHEZZEHEI T A. 2001).
The main parameters of large triaxial rheological apparatus are listed as follows, the axial pressure adjusting range, 0~1.0MPa, with more than 6 month’s stability time, the confining pressure accommodate 50kPa, 100kPa, 150kPa, 200kPa, 250kPa degree, with constant pressure, the soil sample maximal dimension, Φ=300mm, h=600mm, with the maximum grain diameter, dmax=60mm.
Table2 Physical parameters of redstone granular soil sample Water content /% Initial density /(g·cm-3) Grain density /(g·cm-3) Dry densitty /(g·cm-3) Pore ratio /n 8.3 2.05 2.65 1.88 0.47 The dry unit weight was 18.8kN/m3 and the dimension was Φ300mm×600mm for samples.
Online since: September 2013
Authors: Lan Hua Zhou, Liang Li
A large number of direct atmospheric pressure leaching and pressure leaching tests has been conducted to remove impurities in high-titanium slag, such as CaO and MgO, among others.
The pulverization phenomenon for the residue without pretreatment was serious, in which a certain part of the ore grain dissolved quickly, resulting in the pulverization of every drop of crystallized and growing titanium dioxide grain, as shown in Fig. 12a.
Online since: January 2015
Authors: Oleg Kabantsev
Coordinates of σ1, σ2, σ3 main stresses have strength criterion of ceramics and concrete (solution refers to the fine-grained concretes) represented by the surface of general type of .
Fig. 3), according to which the brick is an almost completely brittle material, and the mortar (fine grain concrete) strength condition ultimate curve does not match any of the types recognized and used in [7–11] studies.
P.), it is determined that in the overwhelming number of the researched items, the resistance to axial tension of undressed seams did not exceed 0.06 MPa.
Online since: October 2012
Authors: Zhi Ping Wang, Pin Chuan Chen
Polishing was used to remove the burrs left on the top of the microstructures, and different grain size polishing papers were used.
Figure 5(b) shows the brass mold insert after polishing with different grain size sand papers and dried with compressed air.
Backhouse, “Microfabricated device for DNA and RNA amplification by continuous-flow polymerase chain reaction and reverse transcription-polymerase chain reaction with cycle number selection”, Anal.
Online since: January 2021
Authors: Herbert Danninger, Raquel de Oro Calderon, Christian Gierl-Mayer
A further group of PM products, the largest one by tonnage, are complex-shaped precision parts required in large numbers, PM offering much better material and energy efficiency than e.g. machining from stock [4, 5].
The mechanisms are, with increasing temperature, surface grain boundary and volume diffusion, respectively.
The liquid phase not only penetrates the pore network but also the pressing contacts, according to the „grain boundary attack“ mechanism (see e.g. [8]).
Online since: July 2020
Authors: Ahlam H. Jasim, Wafaa M. Joudi, Nabaa S. Radhi, Amir N. Saud
Where they observed that the changing in the direction of instrument rotational between passes of FSP, increment in the passes’ number, and decrement in the particles of SiC size lead to enriching wear and hardness characteristics.
The excellent particle dispersion produced by the ultra-fine-grained structure in an aluminium matrix.
Aluminium (wt. %) Magnesium (wt%) ZnO (wt%) 98.0 2 0.0 96.0 2 2.0 94.0 2 4.0 92.0 2 6.0 90.0 2 8.0 88.0 2 10.0 To facilitate the melting in the oven, the high purity aluminium wires are cut into small parts, weighed in target quantity (weight proportion wt. per cent) every one of the aluminium tubes, magnesium and zinc oxide with grain size 15-20μm.
Online since: July 2018
Authors: Alexander Meyer, Jörg Franke
Due to the inhomogeneous compaction of the material, there is an uneven alignment of the grains, especially on the punch surfaces.
This leads to imperfections of the parallel alignment of the alloy grains.
The use of a vacuum revolver gripper allows the rapid pick-up of a large number of magnets and easy placing on the rotor surface.
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