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Online since: September 2018
Authors: R.N.A. Silva, B.M. Freitas, Ana Emília Diniz Silva Guedes, Eduardo Rafael Barreda, Josiel Bruno de Oliveira, Mateus Reis Ribeiro, João Carlos Martins, Reinaldo Almeida Rodrigues, Nayra Reis do Nascimento, J.C. de Macêdo Neto, João Evangelista Neto
Process variables: Pre-heat temperature: ≥18 ºC, Interpass temperature: 180 ºC; Filler Metal: AWS 5.10 - ER 5183; Weld position: 4G; Torch: 99.99% Ar (argon); Flow rate: 22 l/min; Cup size: 16mm; Stck-out: 12-14 mm; Transfer mod: Pulsed; Number of passes: 2 (Fig. 1b); Electrical current 150A; Polarity: Direct current - CCEP; Voltage: 24 V; Speed of 15 cm/min.
The figures show dark phases that are precipitated in the grains [6].
The HAZ generally shows a decrease in microhardness, but in this case microhardness values showed that there was no significant recrystallization and / or grain growth in this region.
The figures show dark phases that are precipitated in the grains [6].
The HAZ generally shows a decrease in microhardness, but in this case microhardness values showed that there was no significant recrystallization and / or grain growth in this region.
Online since: January 2006
Authors: Kuen Ming Shu, Hung Rung Shih
Since only the protruded SiCp grains are in contact with the
workpiece, high normal force would cause indentation on the workpiece surface and the transverse
movement of the electrode would cause grooves.
Transverse movement would also let SiCp grains be pulled out of the electrode if it were poorly mounted on the copper matrix, and this would result in the loss of both electrode material and grinding function.
This rate depends on a large number of properties of the workpiece material, including its melting point, thermal conductivity and latent heat.
Transverse movement would also let SiCp grains be pulled out of the electrode if it were poorly mounted on the copper matrix, and this would result in the loss of both electrode material and grinding function.
This rate depends on a large number of properties of the workpiece material, including its melting point, thermal conductivity and latent heat.
Online since: May 2004
Authors: Rui Jorge C. Silva, Francisco Manuel Braz Fernandes, Luís Pereira, V. Assunção, Alexandra Gonçalves, Elvira Fortunato, António Marques, Rodrigo Martins, Hugo Águas, Isabel Ferreira
It is
observed a linear increase on R as the rf
power density increases, due to the amount on
the number of sputtered particles [6].
These values are only explained by a high efficiency of the gallium dopant atoms, without significant defects ascribed to the grain boundaries and so, no significant barrier effect exists limiting the carriers transport between grains.
These values are only explained by a high efficiency of the gallium dopant atoms, without significant defects ascribed to the grain boundaries and so, no significant barrier effect exists limiting the carriers transport between grains.
Online since: October 2002
Authors: O.N. Senkov, F.H. Froes, S.N. Patankar, J. Rahim, Javaid Qazi
Thermohydrogen processing of Ti-6Al-4V, the most
popular �+� alloy which accounts for more than half the total titanium sales, has been studied in
a number of investigations [10-18], with the emphasis on improved workability and refinement
of the microstructure [1, 10-12, 19, 20].
Ti-6Al-4V H PHASE DIAGRAM As cast and hot isostatically pressed (HIPd) Ti-6Al-4V plate supplied by Precision Castparts Corporation (PCC), Portland, Oregon, had a coarse structure, with an average prior beta grain size of 0.97mm and an average lamellar spacing of 5µm (Figure 1).
After hydrogenation, the prior beta grain size, as anticipated, remained unchanged. 2 20µm (a) (a) (b) Figure 1
Ti-6Al-4V H PHASE DIAGRAM As cast and hot isostatically pressed (HIPd) Ti-6Al-4V plate supplied by Precision Castparts Corporation (PCC), Portland, Oregon, had a coarse structure, with an average prior beta grain size of 0.97mm and an average lamellar spacing of 5µm (Figure 1).
After hydrogenation, the prior beta grain size, as anticipated, remained unchanged. 2 20µm (a) (a) (b) Figure 1
Online since: September 2014
Authors: Cheng Gao, Bo Gao, Yi Guang Wang, Jin Yong Xu, Yin Wang
This is because Indium existed into the grain boundary of the matrix so as to this form of the solid solution with the gap.
A large number of iron atoms were sputtered out from the surface.
This was due to solid solution strengthening, grain refinement and Copper and Indium lubrication all had common effects for the surface of the infiltrated Stainless Steel.
A large number of iron atoms were sputtered out from the surface.
This was due to solid solution strengthening, grain refinement and Copper and Indium lubrication all had common effects for the surface of the infiltrated Stainless Steel.
Online since: April 2014
Authors: Qing Jie Jiao, Hui Ren, Bao Liang Han, Si Yi Wang
The process of measurement was the following: 1g delay composition pressed into metal shell was prepared into grain with a diameter of 40 mm and a length of 38 mm.
The grain placed on equipment of flaming velocity measurement.
The formulas used were (1) (2) (3) In these formulae: rA is the average burning rate (mm/s), ri is the burning rate of i sample (mm/s), n is the number of testing samples, α is the delay precision (%), β is the temperature coefficient (K-1), rminvalue + 70° is the minimum of burning rate at 70° (mm/s), rmaxvalue 50° is the maximum of burning rate at 50°(mm/s), and the testing temperatures were Thigh=343 K, Tlow =223 K.
The grain placed on equipment of flaming velocity measurement.
The formulas used were (1) (2) (3) In these formulae: rA is the average burning rate (mm/s), ri is the burning rate of i sample (mm/s), n is the number of testing samples, α is the delay precision (%), β is the temperature coefficient (K-1), rminvalue + 70° is the minimum of burning rate at 70° (mm/s), rmaxvalue 50° is the maximum of burning rate at 50°(mm/s), and the testing temperatures were Thigh=343 K, Tlow =223 K.
Online since: February 2013
Authors: Rafał Michalik, Agnieszka Tomaszewska, Henryk Woźnica
Zn [% mass]
Al [% mass]
Cu [% mass]
Zn [% mass]
ZA8
90.6
8.4
1.0
90.6
ZA12
88.2
11.0
0.8
88.2
ZA22
75.3
22.1
2.6
75.3
ZA27
71.2
26.5
2.3
71.2
The Zn-Al-Cu type alloys are characterized by a number of advantageous properties comprising low fusion temperature, good castability, high strength and hardness, good fatigue strength, low density, low friction factor, low wear rate speed, and low production cost.
ZA12 and ZA27 alloys have a dendritic structure, the grain size and the size of the interdendritic area being depended on casting parameters.
Cooling rate has strong influence on the grain.
ZA12 and ZA27 alloys have a dendritic structure, the grain size and the size of the interdendritic area being depended on casting parameters.
Cooling rate has strong influence on the grain.
Online since: July 2014
Authors: Zhi Shu Yao, Hai Qing Song, Zhen Xu
On grade C60 concrete, the limiting grain size of it’s coarse aggregate should not be greater than 31.5mm.
On above C60 grade concrete, the limiting grain size of it’s coarse aggregate should not be greater than 25mm.
Specimes code Design strength Slump (mm) Compressive strength (MPa) 3d 7d 28d 1 C60 210 56.3 64.3 73.0 2 C60 220 54.0 68.3 72.1 3 C60 190 57.6 63.5 71.1 4 C65 220 58.5 69.2 75.6 5 C65 220 57.5 67.2 75.3 6 C65 200 55.2 61.8 76.3 7 C70 180 60.7 68.2 81.9 8 C70 190 63.0 72.2 83.0 9 C70 190 65.6 73.7 82.4 10 C75 170 68.4 76.4 85.1 11 C75 170 69.1 78.2 86.4 12 C75 180 67.3 77.9 85.7 Engineering application Through a large number of preparation experiments, the optimum mixture ratio of high strength and high performance concrete in deep alluvium freezing shaft lining is obtained, and then engineering application is conducted in three freezing shaft in kouzi East Coal Mine .
On above C60 grade concrete, the limiting grain size of it’s coarse aggregate should not be greater than 25mm.
Specimes code Design strength Slump (mm) Compressive strength (MPa) 3d 7d 28d 1 C60 210 56.3 64.3 73.0 2 C60 220 54.0 68.3 72.1 3 C60 190 57.6 63.5 71.1 4 C65 220 58.5 69.2 75.6 5 C65 220 57.5 67.2 75.3 6 C65 200 55.2 61.8 76.3 7 C70 180 60.7 68.2 81.9 8 C70 190 63.0 72.2 83.0 9 C70 190 65.6 73.7 82.4 10 C75 170 68.4 76.4 85.1 11 C75 170 69.1 78.2 86.4 12 C75 180 67.3 77.9 85.7 Engineering application Through a large number of preparation experiments, the optimum mixture ratio of high strength and high performance concrete in deep alluvium freezing shaft lining is obtained, and then engineering application is conducted in three freezing shaft in kouzi East Coal Mine .
Online since: April 2014
Authors: Xi Juan Wang, Jun Jie Zhang, Jing Xiao Feng, Ming Zhe Zhang
Spread deposit including gas spread deposit and grain spread deposit.
On one hand, the melting point of FeS2 is very low, therefore, the iron ore can be in liquid, on the other hand, the grain of iron ore including sulfur will be larger than others, therefore, it will strike the equipment and promote the fouling produced.
number parameters unit quantity 1 temperature of eject smoke 0c 2 2 pressure of entrance economize coal equipment MPa 1 3 temperature of entrance economize coal equipment 0c 1 4 temperature of exit economize coal equipment 0c 1 5 flow of exit economize coal equipment t/h 1 6 pressure of exit in high temperature equipment MPa 1 7 temperature of exit in high temperature equipment 0c 1 8 temperature of entrance in high temperature equipment 0c 1 9 flow of exit in high temperature equipment t/h 1 9 load MW 1 10 temperature of wall in low temperature equipment 0c 2 11 temperature of wall in high temperature equipment 0c 2 12 temperature of exit in low temperature equipment 0c 1 13 quantity of oxygen % 1 To achieve better result, more parameters should be also needed, but parameters in above table are pivotal.
On one hand, the melting point of FeS2 is very low, therefore, the iron ore can be in liquid, on the other hand, the grain of iron ore including sulfur will be larger than others, therefore, it will strike the equipment and promote the fouling produced.
number parameters unit quantity 1 temperature of eject smoke 0c 2 2 pressure of entrance economize coal equipment MPa 1 3 temperature of entrance economize coal equipment 0c 1 4 temperature of exit economize coal equipment 0c 1 5 flow of exit economize coal equipment t/h 1 6 pressure of exit in high temperature equipment MPa 1 7 temperature of exit in high temperature equipment 0c 1 8 temperature of entrance in high temperature equipment 0c 1 9 flow of exit in high temperature equipment t/h 1 9 load MW 1 10 temperature of wall in low temperature equipment 0c 2 11 temperature of wall in high temperature equipment 0c 2 12 temperature of exit in low temperature equipment 0c 1 13 quantity of oxygen % 1 To achieve better result, more parameters should be also needed, but parameters in above table are pivotal.
Online since: June 2014
Authors: Dusit Ngamrungroj, Surasing Chaiyakun, Nirun Witit-Anun, Kanchaya Honglertkongsakul, Pornpipat Boosabarat
This is due to the formation of stresses of ion size difference between zinc and dopant in the grain boundaries.
These indicated that the films were degraded in the crystallinity and reduced in grain size of the films with increasing the current at aluminum target.
Summary The AZO thin films were degraded in the crystallinity with increasing the currents at aluminum target due to being a large number of aluminum atoms in the films.
These indicated that the films were degraded in the crystallinity and reduced in grain size of the films with increasing the current at aluminum target.
Summary The AZO thin films were degraded in the crystallinity with increasing the currents at aluminum target due to being a large number of aluminum atoms in the films.