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Online since: July 2018
Authors: Kittipong Kimapong, Surat Triwanapong
Since there were the limit number of reports that applied GMAW to weld T-fillet dissimilar metal joint by GMAW, this paper aimed to apply GMAW with various welding parameters for welding the T-fillet AISI304L/AISI316 stainless steels joint and to investigate a relation of mechanical properties and the microstructure of the joint.
The dendrite structure solidified from the fusion metal and small grain sizes of SUS304 in a heat-affected-zone (HAZ) could be observed around the interface of the SUS304/the weld metal.
This highly reinforced element number in the weld metal could produce a larger metal carbide phase amount that led to high strength in metal matrix and directly increased the joint strength [15].
Online since: January 2012
Authors: Victor Sebastian Akpan, Sam Udoh Sunday, Qiang Ma
Structure interpretations before and after the drilling of the wells, show quite a number of faults which control KX and KB traps.
Reservoir Model This paper is considering basic internal-makeup of a reservoir like grain size, porosity and permeability that can easily be predicted from seismic profile studies, ditch cutting and wellsite cores (if available) to provides a framework of connectivity and fluid flow pathways through the reservoir.
Fig.2 The fields as is the case in the Niger Delta (swamp) consist of a number of individual reservoirs that contain oil of varying composition with different gas/oil ratios.
Online since: August 2005
Authors: Dirk Godlinski, Stéphane Morvan
Introduction Quite a number of processes are developed to generate gradients, e.g. for bulk materials via powder technology, or for coatings via chemical, physical or mechanical deposition processes.
The advantages of this manufacturing process are its high speed, the ability to produce a possibly large number of parts simultaneously regardless of their respective geometrical complexities and in particular its flexibility using a broad range of different powders and liquids as inks. 3D-Printing Process for Tailored Metal Parts The idea is to use the 3D-Printing process to generate three dimensional graded parts similar to the inkjet print of a coloured picture on the two-dimensional surface of a paper: Instead of one polymeric binder that burns out completely during sintering, different functional inks containing colloidal dispersed nano-particles are jetted through the print head nozzles (Fig. 1).
The addition of about 0.3% carbon black during printing the green parts increases the density by 9% and leads to significant grain growth and pore growth (Fig. 4a, d).
Online since: June 2017
Authors: Josef Schlattmann, Viktor Krasmik
In [4], the influence of the normal load, the sliding velocity, and the number of contact points on the friction and wear behavior of some exemplary basic metal-metal contact configurations with all flat samples being of identical material was studied.
An increase of the wear rate and no marked change of the coefficient of friction with the number of contact points was reported.
The material of the rotating ball with a diameter of D = 12.7 mm is 100Cr6 (bearing steel, fine-grained low alloy martensitic chrome steel, hardened by heat treatment up to the core).
Online since: March 2006
Authors: Lars Arnberg, Ragnvald H. Mathiesen
This problem accumulated with the number of cycles since pores filling the entire spacing between container walls partly encapsulated in oxide/BN upon thermal shrinkage, preventing them from resolving upon remelting.
The maximum difference in tip cooling between primary arms 2 and 3, numbered from left to right, of about 5 K occurs at t0 + 2.7 s (Fig 1. b)).
However, from several independent observations of fragmentation with other samples, there is a tendency for fragments to detach from regions such as grain boundaries where the mush is more open, indicating that presence of thermo-solutal flow could play a crucial role in the formation of stray crystals.
Online since: April 2011
Authors: Jian Hua Wu, Yun Lan Liu
Table 3 Mix proportion of concrete Number Cement Slag Fly ash Water Sand Stone water-binder ratio Of additive (kg/m3) (kg/m3) (kg/m3) (kg/m3) (kg/m3) (kg/m3) % % SZ1/SR1 367.5 122.5 — 147 689 1124 34 1.0 SZ2/SR2 376.0 94.0 — 150 695 1134 32 1.0 SZ3/SR3 360.0 90.0 — 153 665 1182 30 1.0 FZ1/FR1 392.0 — 98 147 689 1222 34 1.0 FZ2/FR2 399.5 — 71 150 659 1241 32 1.0 FZ3/FR3 382.5 — 68 153 665 1250 30 1.0 KZ/KR 460.0 — — 145 648 1182 32 1.0 Annotation: S is slag; F is fly ash; Z is steam cured; R is standard cured; K is concrete without admixture. 2.4 Test method and specimen handling 1- DC Power Supply 2- Testing Tank 3- Link Network 4- Concrete specimens 5- 3.0% NaCl Solution 6- 0.3mol/L NaOH Solution 7- 1ΩStandard Resistor 8- DC digital voltmeter Figure 1 Schematic diagram of experimental device Figure 2-a Rapid carbonation test equipment Figure 2-b Electric flux test equipmen “Rapid Carbonation” test method refers to "Standard for test method of long-term performance
Table 4 Results of the carbonation and electric flux tests Number Carbonation depth(mm) Electric flux(C) 3d 7d 14d 28d 28d 56d SR1 0.6 2.6 4.8 7.3 920 820 SR2 0.5 2.6 5.6 6.6 1619 935 SR3 0.7 3.2 4.3 4.9 1703 1367 FR1 0.8 4.6 4.8 6.5 1620 1003 FR2 0.6 5.0 7.5 8.2 1613 1023 FR3 0.7 4.1 4.7 5.8 1723 1064 KR 0.4 3.0 4.1 5.2 1629 1405 SZ1 0.8 3.2 5.3 8.3 1028 992 SZ2 0.8 3.3 5.6 8.4 1732 1040 SZ3 0.7 3.5 4.7 7.1 1801 1497 FZ1 0.9 5.4 5.6 7.8 1779 1178 FZ2 0.9 7.4 7.3 8.3 1701 1114 FZ3 0.9 5.5 5.3 6.7 1839 1667 KZ 0.7 4.3 4.7 6.5 1731 1528 3.1 Data analysis of concrete carbonation Fig.3 shows the depth of carbonation of the concrete under the condition of steam curing increases with the growth of time.
The reaction also called “Secondary hydration reaction”, further more it can promote cement generate more C-S-H gel of hydration which made the grain of Ca (OH) 2 smaller in zone where interfaces the paster with aggregate, improves the microstructure of concrete, reduces the porosity of cement paste and enhances the power between aggregate interfacial and paster, the physical and mechanical properties of concrete have been greatly increased【8-10】 【2】 . 4.2 Mechanism of steam curing The ambient temperature of cement hydration increases with the growth of curing temperature, which will accelerate the hydration of cement.
Online since: July 2022
Authors: Rachid M'Saoubi, Joël Rech, Grégory Methon, Cédric Courbon, Mathieu Girinon
Modeling of turning operations has been considered by a large number of papers [1-3] mainly focusing on orthogonal operations [4-8].
The coating is composed of a 5 µm TiAlN layer on a WC-10Co fine grained substrate.
Its value was investigated by [17] and set at: r=N∙f2∙π (2) With N the number of insert, set at 1 in this case, f the feed per tooth (mm/tooth/rev).
Online since: September 2011
Authors: Yan Yang, Xiao Hui Zhou, Xiao Hong Liu, Xiao Ping Lu
The color of Green is made up of yellow pigment, carotene, green bible element, bravery green grain, and so on [1].
The number of group A was from 1 to 9, while the number of group B was from 1’ to 9’. 1 subgroup domestic silkworms were fed pigments from 5 instar 1st day to 9th day, 2 subgroup were fed from 5 instar 2nd to 9th , the others were similarly, 9 subgroup were fed pigments only at 9th .
Online since: December 2013
Authors: Shui Sheng Yang, Jin Cai Su, Xiao Qian Yang, Wei Zhang
Table 1 Arterial highway mileage summary table(including cement concrete pavement project) serial number Project Highway classification overall length (km) The length of cement pavement (km) Built year 1 Baoheng Road second-class 88.985 0.575 1995 2 Hengde Road second-class 60.295 1.411 1997 3 Shihuang Highway Wuqiang Connecting Line second-class 63.7 3.735 1998 4 Zhenggang Line second-class 80.004 12.115 2002 5 Hengde Highway Jingzhou Connecting Line first-class 21.805 18.805 2009 Total 314.789 36.641 1.2.
The original design was to use asphalt concrete pavement, the structure is: 4cm fine grained type asphalt concrete+6cm medium sized asphalt concrete+32cm lime-fly-ash bound macadam+16cm cement stabilized gravel.
Set up a temporary bench mark on the road’s both sides every 100 meters. 2.2.2.Mix and transportation of concrete Material Selection: Taihang Cement PS42.5 number, Zhengding medium sand, Jinan gravel, machine wells, Huaneng Dezhou fly ash from coal-fired power plant, FAC - 6 retarded high efficient water reducing agent.
Online since: July 2016
Authors: Paul J. Cosentino, Farid Messaoud
PPMT probe can be connected to standard cone penetration test (CPT) rods enabling a large number of PPMT tests to be conducted within a site [1].
The next two layers have an average VISP of 26 seconds for silty sand with standard deviation of 7.4 seconds and 33 seconds for fine grained silt with a standard deviation of 8.3 seconds.
The APMT software indicated that the VISP for the limited number of soils evaluated varies from 10 seconds to 80 seconds.
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