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Online since: March 2007
Authors: Shunichi Hashimoto, Shushi Ikeda, Koh Ichi Sugimoto, Mitsuhiro Itoh, Tomohiko Hojo, Goro Arai
When ausformed at 600 and 700 o C, the size of recrystallized polygonal ferrite grain decreases to about 0.5-1.0 µm (c, f), and retained austenite morphology changes from filmy to blocky.
From image quality t (s) TA=400 o C, tA=500s TR=600-900 o C, R=0% or 50% 40o C/s T ( oC) Tγ=900 o C, 1200s Journal Title and Volume Number (to be inserted by the publisher) 3 (IQ) analysis of bcc phase by EBSP, IQ index decreased when ausformed at lower temperature.
Nominal stress - strain curves of steels A and B strained to R=0% or 50% at 900 o C. 0 10 20 30 40 50 60 600 700 800 900 TEl (%) TR (oC) (a) A, R=0% A, R=50% B, R=50% B, R=0% 0 50 100 150 200 600 700 800 900 CIAV (J/cm2) TR (o C) A, R=0%A, R=50% B, R=0% B, R=50% (b) 0 200 400 600 800 1000 1200 1400 0 10 20 30 40 50 60 σ (MPa) ε (%) B, R=0% B, R=50% A, R=50% A, R=0% 400 500 600 700 800 900 600 700 800 900 YS (MPa) TR (oC) A, R=50% B, R=50% B, R=0% A, R=0% (a) 800 900 1000 1100 1200 1300 600 700 800 900 TS (MPa) TR (oC) A, R=50% B, R=50% A, R=0% B, R=0% (b) 0.5 0.6 0.7 0.8 0.9 600 700 800 900 YS/TS TR ( oC) Si, R=50% Al, R=50% Si, R=0% Al, R=0% (c)Journal Title and Volume Number (to be inserted by the publisher) 5 Figure 6.
Note that coarse NbC precipitates in the steel B may contribute to refined microstructure through suppressing grain growth of prior austenite 18) .
Journal Title and Volume Number (to be inserted by the publisher) 7 [17] M.
Online since: June 2010
Authors: Shuo Li, Gao Chao Xu, Feng Wu, Yu Shuang Dong
As the number of cores on CMP increases, the performances of programs running on a CMP platform depend heavily on the usage of shared on-chip cache memory.
Utility Monitors (UMO�) In this paper, a very important technique is the stack property [3],which means that an access that hits in a LRU managed cache containing N ways is guaranteed to also hit if the cache had more than N ways (the number of sets being constant).
Partitioning Algorithm The partitioning algorithm tries to minimize the total number of misses incurred by all the applications.
The UMON [2] mechanism can be combined with CCP to improve miss rate measurement and adapt to fine-grained program phase changes.
Rafique et al. [20] and Petoumenos et al. [26] proposed spatially fine-grained partitioning support, which is supported in CCP by throttling cooperative sharing activities.
Online since: September 2013
Authors: Jin Dong Zhou, Xue Gong Bi, Fu Yang
This is because if the number of phases in the flux is equal to the number of components in the slag system, there is only one degree of freedom, and for a particular temperature there are zero degrees of freedom; the activities of FeO and P2O5 are fixed and therefore independent of the bulk slag composition.
Suito et al. [14-16] measured the distributions between CaO grains, 2CaO·SiO2 grains and CaO-SiO2-FexO slag with five equilibrating methods.
Phosphate capacity of nine slags numbered A through I whose compositions are shown in Figure 3 was calculated by means of the FactSageTM thermodynamic software.
Online since: March 2018
Authors: Dong Won Jung, Hamed Deilami Azodi, Roya Darabi
The great numbers of researchers have been studied optimizations method on formability process for mono-sheets and sandwich plates.
t0b(i)=t0a(i)-2(RG(i)+k(i)d0(i)εb(i)) (2) Where RG(i) is the initial surface roughness, k(i) is the coefficient of grain size, d0(i)is the grain size and εb(i) is the effective strain in the inhomogeneous region in each layer [10,11] According to equilibrium condition, the forces acting on homogenous and heterogeneous regions are equal: i=12F1a(i)=i=12F1b(i) (3) In which F1a(i) and F1b(i) are applied forces in the regions “a” and “b” for layer “i".
Although the Pareto set can provide large number of possible solutions for designer to make their decision, often a decision must still be made for the most satisfactory solution from the Pareto-set.
FlD0 is a point in plane strain condition so it can represent the amount of formability with a number.
Online since: May 2014
Authors: John N. Mundy
Einstein recognized that although atoms were too small to be seen, any minute grain of material immersed in a liquid would be buffeted by the atoms in continuous random motion as slightly greater number of atoms impacted first one side of the grain and then another.
Karl Pearson in the current number of NATURE, is the same as that of the composition of n iso-periodic vibrations of unit amplitude and of phases distributed at random, considered in Phil.
Einstein showed in his 1905 paper that atoms existed and in the next nine years before the outbreak of World War 1 Perrin and his students in a series of very difficult experiments showed not only that atoms exist but determined remarkably high quality values for Avogadro’s number.
Online since: February 2015
Authors: Sergey G. Anikeev, Victor E. Gunter, Timofey L. Chekalkin, Oleg V. Kokorev, Valentina N. Khodorenko
A decent number of works are devoted to studying of porous materials.
Areas of these precipitations are usually located along pore boundaries and along grain boundaries as well.
The surface of pore walls in the SHS-produced material is well-developed, well-shaped, rough and micro-porous, and contains a large number of micro- and nano-pores (Fig. 2a).
In sintered material pore walls are smoother and contain a less number of small pores (Fig. 2b).
Gunter, A.A.Radkevich, Biocompatibility of fine-grained porous NiTi with biological tissues, Shape memory materials and new technologies in medicine, 2004
Online since: September 2019
Authors: Sergey Anatolyevich Kotov, Bogdan Valerevich Avramishin, Evgenii Michalovich Fedorov
In the conclusion of the review of existing methods for processing of carbide waste, it is necessary to describe the shortcomings inherent in these methods: • A large number of stages (all chemical methods) • Poor performance • Partial or total loss of cobalt during processing • Isolation of large amounts of harmful chemical compounds and work with hazardous reagents (chemical methods) • Heavy equipment wear (mechanical grinding) • Iron powder (mechanical grinding) • Difficulty in implementation for small industries due to the need for a large number of different equipment (chemical methods) • Inability to obtain powder of equal or similar in chemical composition to recyclable carbide waste (chemical methods) The method of electro-erosive dispersion is devoid of the shortcomings described above and has great prospects, especially for enterprises that seek to get a full production cycle in one place, including the processing of defective products.
The above installation, despite a number of drawbacks, allowed for electro-erosion dispersion of pieces of bulk material.
Studies show that particles obtained by electroerosion dispersion usually have a subdendritic or highly dispersed dendritic structure with a high density of grains consisting of an oversaturated solid solution of elements and metastable phases.
Setting up the installation and electrolyte selection plays a crucial role in the final grain size.[1] Product Comparison The author [1] obtained a press powder (40% of regenerated VK8 + 60% of ordinary VK8 powder) according to standard technology - kneading with a plasticizer, cold pressing and sintering.
Online since: August 2015
Authors: Agripa Hamweendo, Ionel Botef, Terence Malama
In this study the grain sizes that are used are of the order of 1 nm to 6 nm [8] which is considerably smaller than that of raw particles, assumed to be agglomerated, usually between 1 µm to 50 µm [5], [9], [10].
Molecular dynamics (MD) technique has been applied in a number of experiments on particle impacts to a substrate [11]–[13].
It has been applied in the study of, for example, defect formation and migration, fracture, grain boundaries, structural transformations, radiation damage, elastic and plastic mechanical properties, friction, shock waves, molecular crystals and epitaxial growth [11], [15].
Experimental Design - Molecular Dynamics Simulation There are a number of experimental conditions that can be considered in the CGDS process such as the particle size, incident velocity and angle to the substrate, temperature of the substrate, etc.
The maximum numbers of atoms used in the particle and in the substrate are about 2013 and 60760, respectively.
Online since: December 2022
Authors: Eric Champion, Valery Valle, Amandine Magnaudeix, Patricia Pascuad-Mathieu, Paul Danty, Emeline Renaudie, Fanny Leborgne, Vincent Pateloup
Ceramic parts were characterized by SEM (FEI Quanta 450 FEG) in order to determine the grain size using the ImageJ software.
Then, the region of interest (ROI), i.e. the polymerized areas of the sample and the corresponding ones on the STL file, was manually selected to count the number of areas and calculate the total surface area of matter on a layer using ImageJ software analysis.
The overpolymerization causes an increase of the entities surface polymerized on the green part and a decrease of the number of polymerized entities, i.e. 2 or more small individual entities in close proximity merge into a single one as shown in the circles on Fig. 2(b)).
STL Green Part Number of areas 51 38 Total area (mm²) 22.4 30.3 a b Thermal treatment.
The sintering cycle used allows for obtaining dense ceramic parts with 3-4% of residual closed porosity (Archimedes’ method) and grain size of 2-3µm (Fig. 3(a)).
Online since: February 2006
Authors: Guang Qi Cai, H.S. Qi, R. Cai
In fact, the active cutting edge density (the number of active cutting edges involved in grinding per unit area in the wheel surface), which is the dynamic cutting edge density, is higher than static cutting edge density [5].
There is ample opportunity for the number of cutting edges to increase due to local deflections of the wheel and of the grains.
A 10× objective lens with measurement sampling of 1.65µm was used when measuring with the Wyko RST, which enables values of cutting edge density to be obtained rather than grain density.
The number of active cutting edges in the same area, were counted by observation of the wear flats.
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