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Online since: December 2010
Authors: Ying Tong
Introduction
Aluminum alloy has some advantageous properties that make them an excellent choice for a number of applications.
Metallurgical properties such as the microstructure, alloy constants, grain size and grain form, and non-metallic inclusion content, whilst having a small effect on the strength and the hardness, have a significant effect on the ductile fracture criteria.
Metallurgical properties such as the microstructure, alloy constants, grain size and grain form, and non-metallic inclusion content, whilst having a small effect on the strength and the hardness, have a significant effect on the ductile fracture criteria.
Online since: June 2013
Authors: Zhe Jun Zhang, Yu Luo, Du Yan
Vendor support and utility adoption of the CIM for managing distribution systems will help reduce the long-term costs of application and system integration at a time when the number of integration points is increasing.
Business process languages, such as BPEL, extend the service concepts by providing a method of defining and supporting orchestration of the fine grained service into more coarse-grained business services, which in turn can be incorporated into workflows and business processes.
Business process languages, such as BPEL, extend the service concepts by providing a method of defining and supporting orchestration of the fine grained service into more coarse-grained business services, which in turn can be incorporated into workflows and business processes.
Online since: December 2013
Authors: Wen Qiang Gong, Yong Sheng Zhang
Lower salt section is rhythm interbedded by brown and smoke gray halite, medium-bedded, medium - coarse grain structure, translucent, with thin mudstone and anhydrite; middle salt section dominated by brown rock salt, with small amount of smoke gray rock salt, medium - fine grain structure, sandwiched multilayer mudstone laminate; upper salt section mainly is smoky gray rock salt, medium-bedded.
The Sr/Cu ratios of SJ1 reflect the similar regulation of paleoclimate fluctuation, although they are higher than usual number.
The Sr/Cu ratios of SJ1 reflect the similar regulation of paleoclimate fluctuation, although they are higher than usual number.
Online since: January 2020
Authors: Ekaterina S. Gerasimova, N.Yu. Kamalova
Despite the existing researches devoted to the problem of utilization of quartzitic wastes the percentage of their use remains insignificant and the number of the identified directions is insufficient.
The surface of the coarse grains is covered with dust particles which are held by electrostatic forces.
Characteristics of the dry mixes Indices Value for all mixes Requirements of Russian standard 31358-2007 Humidity [%] 0.1 ≤ 0.2 Dmax [mm] 2.5 ≤ 5.0 Quantity of grains of Dmax [%] 2.5 ≤ 5.0 Table 5.
The surface of the coarse grains is covered with dust particles which are held by electrostatic forces.
Characteristics of the dry mixes Indices Value for all mixes Requirements of Russian standard 31358-2007 Humidity [%] 0.1 ≤ 0.2 Dmax [mm] 2.5 ≤ 5.0 Quantity of grains of Dmax [%] 2.5 ≤ 5.0 Table 5.
Online since: January 2012
Authors: Wei Ping Sun
Introduction
With the aim of refining austenite grains and/or controlling recrystallization and precipitation kinetics during hot rolling and subsequent cooling or coiling, thermomechanical processing (TMP) has been extensively applied to the development and production of conventional high strength steels over the last forty years [1,2].
This means that a far lower total reduction is employed during hot rolling at a CSP® than at an integrated mill for a sheet steel product with the same final gauge, which influences the kinetics of recrystallization, precipitation and grain refinement.
To evaluate the impact toughness and crash resistance of these products, a number of V-notch Charpy specimens were prepared from as-produced steels according to ASTM E23-05, and then tested at the ambient temperature.
This means that a far lower total reduction is employed during hot rolling at a CSP® than at an integrated mill for a sheet steel product with the same final gauge, which influences the kinetics of recrystallization, precipitation and grain refinement.
To evaluate the impact toughness and crash resistance of these products, a number of V-notch Charpy specimens were prepared from as-produced steels according to ASTM E23-05, and then tested at the ambient temperature.
Online since: May 2016
Authors: Wilaiwan Leenakul, Pratthana Intawin, Thanaporn Boonchoo
Introduction
Recently, a number of research into, and the manufacturing of, magnetic nanoparticles has been widely investigated in various applications such as magnetic seals in motors, magnetic inks for bank cheques and magnetic recording media.
However, the grain of MnFe2O4 was found to appear in the 20 MF sample with heated at 800°C and it slightly increases with increasing heat treatment temperature to1000°C.
The grain size was in a range of 0.5-1.0 μm regardless of the heat treatment temperature.
However, the grain of MnFe2O4 was found to appear in the 20 MF sample with heated at 800°C and it slightly increases with increasing heat treatment temperature to1000°C.
The grain size was in a range of 0.5-1.0 μm regardless of the heat treatment temperature.
Online since: September 2013
Authors: Guang Yong Pan
Although China construction units in the field more, but only a handful of construction unit has introduced the foreign high pressure DTH drill, and supporting the use of drilling and percussion tools products mainly imports, domestic to φ382 (15 inches) DTH bit production are still in development stage, the developed products are mainly exist main body fracture, insert product defects such as grain, breaking away[3].
Main Technical Parameters ofφ382 DTH drill We to a large number of domestic and foreign materials at the forefront of DTH drill is introduced as the foundation, according to foreign 12-inch impacter and 15 inches high pressure data related to the product sample as well as the development of domestic φ382 (15 inches) paper summarizes DTH drill test data, and makes references to supporting the use of high pressure DTH drilling rig based numerical wind pressure, gas consumption, etc, its main technical parameters of limit index calculation is as follows: 2.1 Bit impact energy According to materials, drilling alloy tooth broken rock column, every minimal energy is 14 joule per tooth, inherit the maximum energy of 72 joules/tooth, the tooth bit each column energy can be in 14-72 (joules/teeth), the impact energy calculation is reliable.
Strength [MPa] 1608 1350 +258 yield Strength [MPa] 1180 1060 +120 Elongation [%] 14 17 -3 Reduction of Area [%] 48 54 -6 Impact Energy Akv [J] 36 60 -24 From table 5 shows that the development of new domestic large diameter high pressure DTH bit 20CrMnSiNi2MoA materials on the tensile strength and yield strength is higher than similar foreign products 4330 mod materials, development of new materials on the resistance to overload ability is better than that of similar foreign products materials; And new material percentage elongation, reduction of area, impact value is low, show the development of new materials in some poor ability to resist crack instability expansion, therefore, we to material smelting, forging, heat treatment process was put forward strict requirements, the main measures mainly has: (1) Product size each transition cross section must be rounded; (2) Within the overall machining precision up to 3.2; (3) The surface and inner hole are all shot blast; (4) Refinement of grain
Main Technical Parameters ofφ382 DTH drill We to a large number of domestic and foreign materials at the forefront of DTH drill is introduced as the foundation, according to foreign 12-inch impacter and 15 inches high pressure data related to the product sample as well as the development of domestic φ382 (15 inches) paper summarizes DTH drill test data, and makes references to supporting the use of high pressure DTH drilling rig based numerical wind pressure, gas consumption, etc, its main technical parameters of limit index calculation is as follows: 2.1 Bit impact energy According to materials, drilling alloy tooth broken rock column, every minimal energy is 14 joule per tooth, inherit the maximum energy of 72 joules/tooth, the tooth bit each column energy can be in 14-72 (joules/teeth), the impact energy calculation is reliable.
Strength [MPa] 1608 1350 +258 yield Strength [MPa] 1180 1060 +120 Elongation [%] 14 17 -3 Reduction of Area [%] 48 54 -6 Impact Energy Akv [J] 36 60 -24 From table 5 shows that the development of new domestic large diameter high pressure DTH bit 20CrMnSiNi2MoA materials on the tensile strength and yield strength is higher than similar foreign products 4330 mod materials, development of new materials on the resistance to overload ability is better than that of similar foreign products materials; And new material percentage elongation, reduction of area, impact value is low, show the development of new materials in some poor ability to resist crack instability expansion, therefore, we to material smelting, forging, heat treatment process was put forward strict requirements, the main measures mainly has: (1) Product size each transition cross section must be rounded; (2) Within the overall machining precision up to 3.2; (3) The surface and inner hole are all shot blast; (4) Refinement of grain
Online since: March 2016
Authors: Bin Wang, Xiao Jun Xue, Bo Bo Lei, Liang Wang, Ming Xu
Number
Heat treatment process
Corrosion rate/ g/m2·h
G28-A
G28-B
F-4
560℃/8h, air cooling
2.77
0.62
F-5
580℃/8h, air cooling
2.447
0.684
F-6
580℃/4h, air cooling
2.35
0.66
F-7
580℃/2h, air cooling
2.36
0.65
F-8
600℃/8h, air cooling
2.79
0.684
F-9
650℃/8h, air cooling
7.87
9.91
F-0
Applied alloy
2.81
0.52
Microstructural observation and analysis.
Seen from Fig.7, Fig.8 and Fig.11, microstructure of C-276 alloy under 580℃/8h heat treatment process was mainly relatively uniform austenite, and the precipitation phase was found in grain boundaries and grain under 500X; There were many point pericipitates in microstructure of C-276 alloy under 650℃/8h heat treatment process, and pericipitates lined strip, which affected the corrosion resistance of alloy.
Seen from Fig.7, Fig.8 and Fig.11, microstructure of C-276 alloy under 580℃/8h heat treatment process was mainly relatively uniform austenite, and the precipitation phase was found in grain boundaries and grain under 500X; There were many point pericipitates in microstructure of C-276 alloy under 650℃/8h heat treatment process, and pericipitates lined strip, which affected the corrosion resistance of alloy.
Online since: August 2014
Authors: Xiao Hong Feng
By calculating the reduction rate of grains with different particle diameter, cohesion effects of SINOCLEAN cohesion unit for different size particles is analyzed.
The particle reduction ratio of particles with diameter 1.0~8.5μm is in negative trend, i.e., passing through the condensation unit, the count concentration of particles within the size range increases, wherein the condensation ratio of grains with diameter in the range of 6.5 to 8.5μm increases at most.
It showed that after passing SINOCLEAN agglomerator, the aggregation phenomenon of particles within the range of 0.5~1.0μm occurs more obvious, but causing the number concentration of particles within the range of 1.0~8.5μm increased significantly.
The particle reduction ratio of particles with diameter 1.0~8.5μm is in negative trend, i.e., passing through the condensation unit, the count concentration of particles within the size range increases, wherein the condensation ratio of grains with diameter in the range of 6.5 to 8.5μm increases at most.
It showed that after passing SINOCLEAN agglomerator, the aggregation phenomenon of particles within the range of 0.5~1.0μm occurs more obvious, but causing the number concentration of particles within the range of 1.0~8.5μm increased significantly.