Semi-Solid Slurry Casting Using Gas Induced Semi-Solid Technique to Enhance the Microstructural Characteristics of Al-4.3Cu Alloy

2019 ◽  
Vol 285 ◽  
pp. 253-258
Author(s):  
M. Abdi ◽  
S.G. Shabestari
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Temperature Drop ◽  
Inert Gas ◽  
Globular Structure ◽  
Cast Sample ◽  
A206 Alloy ◽  
Gas Purging ◽  
Semi Solid ◽  
Conventionally Cast

Semi-solid processing of Al-4.3%Cu (A206) alloy was performed by Gas Induced Semi-Solid (GISS) process in different condition. The flow rate of argon gas, starting temperature for gas purging (the temperature of superheated-melt) and the duration of gas purging were three key process variables which were changed during this investigation. It was found that inert gas purging near liquidus, significantly, led to the microstructural modification from fully dendritic to globular structure. Thermal analysis was successfully implemented through CA-CCTA technique to understand the cause of the microstructure change during GISS process. The results showed that gas purging into the melt leads to temperature drop of the melt to its liquidus just after a few seconds from start of gas purging. In fact, copious nucleation was induced by cooling effect of inert gas bubbles. Microstructural features were characterized in semi-solid as well as on conventionally cast samples. The optimum gas purging temperature, injection time, and inert gas flow rate was determined in semi-solid processing to obtain the best globularity in the microstructure of a long freezing range alloy. However, the microstructure of the conventionally cast sample was fully dendritic with shrinkage which affects the soundness of casting products.

Fabrication of Rheological Material by Rotating Gas Bubble Stirring

2011 ◽  
Vol 239-242 ◽  
pp. 1573-1576 ◽  
Author(s):  
Lei Zhang ◽  
Xuan Pu Dong ◽  
Wen Jun Wang ◽  
Rong Ma ◽  
Ke Li ◽  
...  
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Rotation Speed ◽  
Gas Bubble ◽  
Gas Flow Rate ◽  
Control Functions ◽  
Stirring Effect ◽  
Strong Convection ◽  
Semi Solid ◽  
Flow Rate Control

A rotating gas bubble stirring technique with specially designed equipment has been developed for the production of light alloy semi-solid slurry. The equipment was specially designed to have temperature, rotation speed and gas flow rate control functions. An Al-Si aluminum alloy was applied as the experimental material. The results showed that large volume of semi-solid slurry could be achieved with the actual stirring temperature of 4 °C to 20 °C below the liquidus temperature of the alloy, and the rotation speed of 195 r/min, and the gas flow rate of 2 L/min. A strong convection and weak stirring effect which was induced by the rotating gas bubbles in the melt was founded responsible for the formation of the semi-solid slurry.

Effect of Inert Gas Flow Rate on Homogenization and Inclusion Removal in a Gas Stirred Ladle

2010 ◽  
Vol 81 (12) ◽  
pp. 1056-1063 ◽  
Author(s):  
M. Ek ◽  
L. Wu ◽  
P. Valentin ◽  
D. Sichen
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Inert Gas ◽  
Gas Flow Rate ◽  
Inclusion Removal

Heat Transfer Enhancement in Evaporating Mini-Layers: Effects of an Inert Gas Flow

2007 ◽  
Author(s):  
C. S. Iorio ◽  
O. A. Kabov
Keyword(s):  
Heat Transfer ◽  
Flow Rate ◽  
Thermal Instability ◽  
Gas Flow ◽  
Flow Direction ◽  
Inert Gas ◽  
Transfer Enhancement ◽  
Capillary Stress ◽  
Volatile Liquid ◽  
Thermo Physical Properties

When a layer of volatile liquid is subject to a flow of inert gas, a non-uniform distribution of the evaporation rate is generated all along the interface. Being evaporation stronger at the inlet boundary of the layer, because of the maximal efficiency of the inert gas flow in removing vapor from the interface, a thermal gradient along the interface is generated. Two opposite mechanisms regulate the movement of the interface: the shear stress of the gas that entrains the interface in the direction of the flow and the thermo-capillary stress that forces the interface to move against the flow direction. Moreover, because of the overall cooling of the interface due to the evaporative process, a gradient normal to the interface is also created. It results in a potentially unstable situation that is strongly influenced by the flow rate of inert gas, the layer thickness and the liquid thermo-physical properties. The goal of the present work is to study numerically if and how the dynamic evolution of the liquid layer is driven by the above-mentioned mechanisms. The main results concern the evaluation of the influence of the thermal instability patterns, eventually generated by the concurrent action of non-uniform evaporation and thermo-capillary motion, on the heat transfer at the bottom liquid. The distribution of temperature and velocity in the gas and liquid bulk phase for different mass flow rate of inert gas has also been of interest.

scholarly journals Investigation of Mechanical Properties of Metal Inert Gas-Brazed TRIP800 Steel Joints Using Different Shielding Gas Flow Rate

2014 ◽  
Vol 125 (2) ◽  
pp. 473-474 ◽  
Author(s):  
N. Akkas ◽  
F. Varol ◽  
E. Ferik ◽  
E. Ilhan ◽  
U. Ozsarac ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flow Rate ◽  
Gas Flow ◽  
Inert Gas ◽  
Shielding Gas ◽  
Gas Flow Rate ◽  
Steel Joints

Effect of Inert Gas Flow Rate on the Inorganic Bromate Oscillator

1989 ◽  
Vol 162 (Part_1) ◽  
pp. 21-26 ◽  
Author(s):  
L'ubica Adamčíková ◽  
Peter Ševčík
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Inert Gas ◽  
Gas Flow Rate

scholarly journals Modification of Liquid Steel Viscosity and Surface Tension for Inert Gas Atomization of Metal Powder

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 521
Author(s):  
Iurii Korobeinikov ◽  
Anton Perminov ◽  
Tobias Dubberstein ◽  
Olena Volkova
Keyword(s):  
Surface Tension ◽  
Liquid Metal ◽  
Metal Powder ◽  
Flow Rate ◽  
Gas Flow ◽  
Metal Flow ◽  
Inert Gas ◽  
Powder Size ◽  
Gas Atomization ◽  
Technological Parameters

Inert gas atomization is one of the main sources for production of metal powder for powder metallurgy and additive manufacturing. The obtained final powder size distribution is controlled by various technological parameters: gas flow rate and pressure, liquid metal flow rate, gas type, temperature of spraying, configuration of nozzles, etc. This work explores another dimension of the atomization process control: modifications of the liquid metal properties and their effect on the obtained powder size. Series of double-alloyed Cr-Mn-Ni steels with sulfur and phosphorus were atomized with argon at 1600 °C. The results indicate that surface tension and viscosity modifications lead to yielding finer powder fractions. The obtained correlation is compared with the individual modification of surface tension with S and Se and modification of viscosity with phosphorus. Discrepancy of the results is discussed. Additives of surfactants and viscosity modifiers can be a useful measure for powder fractions control.

scholarly journals Welding Current and Shielding Gas Flow Rate Effect to The Intermetalic Layer Formation of Tungsten Inert Gas (Tig) on Dissimilar Metals Weld Joints Between Galvanized Steel and Aluminium Aa 5052 By Using Al-Si 4043 Filler

2017 ◽  
Vol 16 (1) ◽  
Author(s):  
Gilang Sigit Saputro ◽  
Triyono . ◽  
Nurul Muhayat
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Intermetallic Layer ◽  
Welding Current ◽  
Galvanized Steel ◽  
Inert Gas ◽  
Welding Parameters ◽  
Dissimilar Metals ◽  
Shielding Gas ◽  
Gas Flow Rate

Tungsten Inert Gas welding of galvanized steel-aluminium useful for weight reduction, improve perform and reduce cost production. The effect of welding parameters, welding current and shielding gas flow rate on the intermetallic formation and hardness of dissimilar metals weld joint between galvanized steel and aluminium by using AA 5052 filler was determined. In this research, welding speed was consistent kept. The welding parameters were obtained by using welding currents of 70, 80 and 90 A, shielding gas flow rate of 10, 12 and 14 litre/min. The intermetallic layer thickness increased by welding currents of 70 A to 80 A, but then it dropped on 90 A. The higher of a shielding gas flow rate, the lower the thickness of the intermetallic layer. The higher of a welding current, the lower the hardness of weld. The higher of a shielding gas flow rate, the greater the hardness of weld. As a result,the maximum hardness by current variation of 70 A and a shielding gas flow rate of 14 Litre/min was 100.9 HVN.

Desulfurization of Hot Metal Through In Situ Generation of Magnesium in 30-kg Molten Iron Bath-Influence of Inert Gas Flow Rate

2013 ◽  
Vol 85 (5) ◽  
pp. 927-934 ◽  
Author(s):  
Anil Kumar ◽  
Zachariah Elanjickal Chacko ◽  
Madurai Malathi ◽  
Kesri Mino Godiwalla ◽  
Satish Kumar Ajmani ◽  
...  
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Molten Iron ◽  
Inert Gas ◽  
Gas Flow Rate ◽  
Hot Metal ◽  
In Situ Generation ◽  
Iron Bath

Metal Inert Gas (MIG) Welding Process Optimization for Joining Aluminum 5754 Sheet Material Using OTC/Daihen Equipment

Manufacturing ◽  
2003 ◽  
Author(s):  
R. Koganti ◽  
C. Karas ◽  
A. Joaquin ◽  
D. Henderson ◽  
M. Zaluzec ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Process Parameters ◽  
Flow Rate ◽  
Gas Flow ◽  
Power Input ◽  
Interaction Effects ◽  
Inert Gas ◽  
Weld Penetration ◽  
Mig Welding ◽  
Gas Flow Rate

The development of lightweight vehicles, in particular aluminum intensive vehicles, require significant manufacturing process development for joining and assembling aluminum structures. Currently, 5xxx and 6xxx aluminum alloys are being used in various structural applications in a number of lightweight vehicles worldwide. Various joining methods, such as MIG, Laser and adhesive bonding have been investigated as technology enables for high volume joining of 5xxx, and 6xxx series alloys. In this study, metal inert gas (MIG) welding is used to join 5754 non-heat-treatable alloy sheet products. The objective of this study is to develop optimum weld process parameters for non-heat-treatable 5754 aluminum alloys. The MIG welding equipment used in this study is an OTC/Daihen CPD-350 welding systems and DR-4000 pulse power supply. The factors selected to understand the influence of weld process parameters on the mechanical properties and metallurgy (weld penetration) include power input (torch speed, voltage, current, wire feed), pulse frequency, and gas flow rate. Test coupons used in this study were based on a single lap configuration. A full factorial design of experiment (DOE) was conducted to understand the main and interaction effects on joint failure and weld penetration. The joint strengths and weld penetrations are measured for various operating ranges of weld factors. Post weld analysis indicates, power input and gas flow rate are the two signficant factors (statistically) based on lap shear load to failure and weld penentration data. There were no 2-way or 3-way interaction effects observed in ths weld study. Based on the joint strength and weld penetration, optimum weld process factors were determined.

Production of Size-Selected CuXSn1-X Nanoclusters

2011 ◽  
Vol 295-297 ◽  
pp. 70-73 ◽  
Author(s):  
Ahmad I. Ayesh ◽  
Naser Qamhieh ◽  
Saleh Thaker Mahmoud ◽  
Hussain Alawadhi
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Discharge Power ◽  
Inert Gas ◽  
Gas Flow Rate ◽  
Quadrupole Mass ◽  
Gas Condensation ◽  
Operation Conditions ◽  
Source Operation ◽  
Production Mechanisms

Composites of copper–tin (CuxSn1-x) nanoclusters were synthesized using the magnetron dc sputtering gas–condensation technique. Targets with controlled ratios of Sn to Cu were used to produce CuxSn1-xwith different compositions. The effects on the nanocluster size and yield of the sputtering discharge power, inert gas flow rate, and aggregation length were investigated using a quadrupole mass filter. The sputtering discharge power was optimized to maximize the nanocluster yield. The results show that as the inert gas flow rate increases the nanocluster size increases and then decreases. These dependences could be understood in terms of the dominant nanocluster production mechanisms. This work demonstrates the ability of controlling the CuxSn1-xnanoclusters’ size and composition by optimizing the source operation conditions.

Sign in / Sign up

Export Citation Format

Share Document