scholarly journals The Effect of Processing Variables on Powder Interlayer Bonding in Nickel-Based Superalloys

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 601 ◽  
Author(s):  
Olivia Stanners ◽  
Sean John ◽  
Helen M. Davies ◽  
Ieuan Watkins ◽  
Silvia Marchisio
Keyword(s):  
Base Material ◽  
High Energy ◽  
Energy Requirements ◽  
Joining Technology ◽  
Lower Porosity ◽  
Induction Current ◽  
Interlayer Bonding ◽  
Powder Interlayer ◽  
Solid State Joining ◽  
Initial Results

Powder Interlayer Bonding (PIB) has been considered as a lower-energy joining technology for nickel-based superalloys compared to conventional methods; such as friction welding. Typically; nickel-based superalloys exhibit high energy requirements for joining due to their high operating temperatures. However; PIB utilizes a localized temperature gradient created by an induction current; reducing the energy requirements for the process. PIB is a solid-state joining method that compresses and heats a powder interlayer between two faying surfaces to produce one joined workpiece. It has been successfully used to bond titanium alloys; and the objectives of this work were to explore its application as a joining method for nickel-based superalloys. Initial results showed that joining nickel-based superalloys via PIB is possible; and bondlines with very little porosity were observed. Further analysis showed that these bonded areas had lower porosity than the base material; suggesting PIB could be a successful joining method for difficult-to-join nickel-based superalloys.

scholarly journals Influence of Mx-Trivex, A-Skew, Three Flat Threaded and Concave Shouldered Mx-Triflute Tool Pin Profiles on Tensile Properties and Fractural Behaviour of Aa 6082-T6 Weldments During Friction Stir Welding

2020 ◽  
Vol 9 (4) ◽  
pp. 1376-1384
Keyword(s):  
Friction Stir Welding ◽  
Tensile Test ◽  
Weld Zone ◽  
Base Material ◽  
Traverse Speed ◽  
Friction Stir ◽  
Tool Pin ◽  
Solid State Joining ◽  
Joining Process ◽  
Brass Wire

Friction Stir Welding (FSW) is a topical and propitious solid-state joining process producing economical and strengthened joints of age-hardened and heat-treatable Aluminium Alloy AA 6082-T6. Mechanical and fractural behaviour of weldments were investigated in order to find crack initiation and necking on the weld zone thereby perceiving the complete behaviour of fracture occurred near the weld zone. Weldments are fabricated by employing four tool pin profiles namely MX-TRIVEX, A-SKEW, Three flat threaded and Concave shouldered MX-TRIFLUTE tools at various rotational speeds 1000 rpm, 1200 rpm and 1400 rpm at single traverse speed 25 mm/min. EXCETEX-EX-40 CNC wire cut EDM with 0.25 mm brass wire diameter has been employed to perform the extraction of tensile test specimens from the weldments according to ASTM E8M-04 standard. Tensile test was performed on elctromechanically servo controlled TUE-C-200 (UTM machine) according to ASTM B557-16 standards Maximum Ultimate Tensile Strength (UTS) of 172.33 MPa (55.5% of base material) and 0.2% Yield Stress (YS) of 134.10 MPa (51.5% of base material) were obtained by using A-SKEW at 1400 rpm, 25 mm/min and maximum % Elongation (%El) of 11.33 (113.3% of base material) was obtained at MX-TRIVEX at 1000 rpm, 25 mm/min. Minimum UTS of 131.16 MPa (42.30% of base material) and 0.2% YS of 105.207 MPa (40.46% of base material )were obtained by using Concave shouldered MX-TRIFLUTE at 1400 rpm, 25 mm/min. Minimum % El of 5.42 ( 54.2% of base material) was obtained by using A-SKEW at 1000 rpm, 25 mm/min.

Silicon Material Growth for Nuclear Radiation Detectors

1982 ◽  
Vol 16 ◽  
Author(s):  
P. A. Glasow ◽  
B. O. Kolbesen
Keyword(s):  
Electronic Devices ◽  
Base Material ◽  
Radiation Detectors ◽  
High Energy ◽  
Nuclear Radiation ◽  
High Energy Particle ◽  
Energy Particle ◽  
Particle Detectors ◽  
X Ray ◽  
Nuclear Radiation Detectors

As a base material for semiconductor devices, silicon is more widely used than any other semiconductor. The physical properties, in particular the bandgap which is significantly larger than that of germanium, makes the material extremely important for electronic devices. The world's total annual production of silicon is at present some 2000 t [1]. Compared with this, the 10 kg/year of silicon that is used for detectors is rather modest. However, since work on semiconductor radiation detectors started 25 years ago, silicon in addition to germanium forms the centre of interest as the basis for production of nuclear radiation spectrometers, mainly as high energy particle detectors, but also as X-ray detectors.

scholarly journals Initial Results From a CdTe High-Energy X-ray Detector on a TEM

2016 ◽  
Vol 22 (S3) ◽  
pp. 312-313
Author(s):  
Hendrik O. Colijn ◽  
David W. McComb
Keyword(s):  
High Energy ◽  
X Ray ◽  
Initial Results

scholarly journals Characterization of the Agricultural Supply of Desalinated Seawater in Southeastern Spain

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1233 ◽  
Author(s):  
Victoriano Martínez-Alvarez ◽  
Jose F. Maestre-Valero ◽  
Manuel J. González-Ortega ◽  
Belén Gallego-Elvira ◽  
Bernardo Martin-Gorriz
Keyword(s):  
Socioeconomic Development ◽  
High Energy ◽  
Water Sources ◽  
Irrigation District ◽  
Energy Requirements ◽  
Irrigated Agriculture ◽  
Seawater Desalination ◽  
Alternative Source ◽  
Production And Distribution ◽  
Desalination Plants

The increasing shortage of water for crop irrigation in arid and semiarid regions is encouraging the use of non-conventional resources. In the last decade, seawater desalination has consolidated its position as an alternative source to increase the supply for agricultural irrigation in Spain and Israel, where the farmers’ acceptance is progressively rising, despite the supply price being much higher than that of other conventional water sources. This article describes the current situation of desalinated seawater production and supply to agriculture in the southeast of Spain, and analyzes key questions such as its role in regional water planning, the infrastructure needed for conveyance and distribution, the energy requirements, the production and distribution costs, and the final price to farmers. The study is based on descriptive and quantitative data collected from desalination plants and irrigation district managers through technical questionnaires and personal interviews. The results show how seawater desalination is effectively alleviating the regional constraints in the irrigated agriculture supply, and why it is becoming strategic to maintaining food production and socioeconomic development. However, the high-energy requirements and associated costs in comparison with other water sources limit a more widespread use for agriculture, and for this reason desalinated water still only plays a complementary role in most irrigation districts.

scholarly journals Powder interlayer bonding of geometrically complex Ti-6Al-4V parts

2019 ◽  
Vol 106 (9-10) ◽  
pp. 3629-3639 ◽  
Author(s):  
I. T. Watkins ◽  
H. M. Davies ◽  
O. G. Stanners ◽  
S. Marchisio
Keyword(s):  
Fusion Zone ◽  
Volume Fraction ◽  
Cost Effective ◽  
Heating Source ◽  
Pressure Application ◽  
Alloy Strength ◽  
High Integrity ◽  
Interlayer Bonding ◽  
Powder Interlayer ◽  
Initial Heating

AbstractPowder interlayer bonding (PIB) is a novel joining technique, which has been developed to facilitate high-integrity repairs of aerospace components, manufactured from commonly used titanium alloys. The PIB technique utilises an interlayer between complex geometric components which are mated under pressure and a highly localised heating source. In this study, induction heating enabled bonding in an inert fusion zone by use of an oxygen-displacing shielding gas, with particular attention to the initial heating and pressure application. These early stages proved crucial to the elimination of pores and consolidation of the alloy powder, with porosity volume fraction reduced to just 0.5% after just 20 sec at the bonding force. The technique has produced high-integrity bonds in alloys such as Ti-6Al-4V, retaining approximately 90% of the alloy strength in previous studies, offering advantages over established joining methods such as tungsten inert gas (TIG) and plasma arc (PA) welding due to a more highly localised heating and fusion zone. It is believed that powder interlayer bonding can compete against these techniques, providing a more time and cost-effective repair route for net shape components manufactured from a range of alloys with minimal post-processing.

Porosity Evaluation of Alternative Materials Based on Portland Cement

2014 ◽  
Vol 1000 ◽  
pp. 314-317 ◽  
Author(s):  
Ladislav Pařízek ◽  
Eva Bartoníčková ◽  
Vlastimil Bílek Jr. ◽  
Jiří Kratochvíl
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Coal Combustion ◽  
Mercury Intrusion Porosimetry ◽  
Raw Materials ◽  
High Energy ◽  
Energy Requirements ◽  
Mercury Intrusion ◽  
Secondary Raw Materials ◽  
Alternative Materials

High energy requirements and the resulting economic demands due to the production of Portland cement leads to tendency to replace a portion of cement with secondary raw materials or to use other alternative binders. Among the commonly used cements replacements is currently fly ash which is produced during the coal combustion. In this paper the influence of cement/ash ratio in a paste on paste’s porosity is investigated using mercury intrusion porosimetry.

Experiment of Laser Shock Processing on AISI 8620 Alloy Steel

2011 ◽  
Vol 464 ◽  
pp. 478-481
Author(s):  
R.H. Shen ◽  
J.Z. Lu ◽  
J.W. Zhong ◽  
L. Zhang ◽  
Kai Yu Luo ◽  
...  
Keyword(s):  
Residual Stress ◽  
Surface Hardness ◽  
Base Material ◽  
High Amplitude ◽  
High Energy ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Before And After ◽  
Shock Peening ◽  
Shock Processing

Laser shock processing (LSP, also known as Laser shock peening) is applied by using a high energy pulsed laser to create a high amplitude stress wave or shock wave on the surface to be treated. LSP is proved to be superior to conventional treatments such as shot peening in many engineering products. This paper focuses on Laser shock processing and its effects on mechanical properties of material AISI 8620 alloys steel. Experiment results indicated that compared with base material, the surface hardness increased by 13.8%, and compressive residual stress increased by 521%. Statistical method was introduced to analyze hardness and residual stress change before and after the LSP.

scholarly journals Initial results from the high energy experiment PDS aboard BeppoSAX

1997 ◽  
Author(s):  
F. Frontera ◽  
D. Dal Fiume ◽  
E. Costa ◽  
M. Feroci ◽  
M. Orlandini ◽  
...  
Keyword(s):  
High Energy ◽  
Initial Results
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