Effect of Superheat Melt Treatment on Microstructure and Mechanical Properties of Aluminum Alloys Produced by Lost Foam Casting

2018 ◽  
Vol 284 ◽  
pp. 593-597 ◽  
Author(s):  
Vladislav Deev ◽  
Evgeny Prusov ◽  
K. Ponomareva
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Technology Implementation ◽  
Isothermal Holding ◽  
Lost Foam Casting ◽  
Resource Saving ◽  
Fine Grained ◽  
Aluminum Castings ◽  
Temperature State ◽  
Lost Foam

The resource-saving technology for producing of thin-walled castings from A356.1, A413.1 and A360.0 aluminum alloys by the lost foam casting method, as well as the results of this technology implementation in production conditions are considered in the paper. The technology involves thermo-speed treatment of the melt with the predominance of secondary materials in charge (85...90 wt.%), including isothermal holding and subsequent rapid cooling of the melt for fixation the high-temperature state. It is shown that the use of thermo-speed treatment promotes the production of aluminum castings with fine-grained microstructure and the enhanced level of mechanical properties without the addition of costly modifying additives, and makes it possible to use an increased amount of secondary charge materials during smelting.

Microstructure and Mechanical Properties of Lost Foam Casting AZ91D Alloy Produced with Mechanical Vibration

2011 ◽  
Vol 213 ◽  
pp. 5-8 ◽  
Author(s):  
Ji Qiang Li ◽  
Zi Tian Fan ◽  
Xuan Pu Dong ◽  
Wen Liu ◽  
Xianyi Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Strong Influence ◽  
Mechanical Vibration ◽  
Lost Foam Casting ◽  
Az91d Alloy ◽  
Az91d Magnesium Alloy ◽  
Coarse Microstructure ◽  
Alloy Increase ◽  
Lost Foam

Mechanical vibration was introduced into the solidification in order to overcome the defects of coarse microstructure and low mechanical properties of the AZ91D magnesium alloy via lost foam casting（LFC）. The microstructure with fine uniform dendrite grains were achieved with mechanical vibration, which was mainly attributed to the cavitation and the melts flow induced by the mechanical vibration. The mechanical vibration has strong influence on the mechanical properties of AZ91D alloy. With application of mechanical vibration, the ultimate tensile strength and elongation of the AZ91D alloy increase 23% and 26%, resepectively.

scholarly journals Influence of Pattern Coating Thickness on Porosity and Mechanical Properties of Lost Foam Casting of Al-Si (LM6) Alloy

2013 ◽  
Vol 300-301 ◽  
pp. 1281-1284
Author(s):  
Shamsuddin Sulaiman ◽  
M.K.A.M. Ariffin ◽  
S.H. Tang ◽  
A. Saleh
Keyword(s):  
Mechanical Properties ◽  
Molten Metal ◽  
Coating Thickness ◽  
Air Entrainment ◽  
Expanded Polystyrene ◽  
Lost Foam Casting ◽  
Polystyrene Foam ◽  
Porosity Distribution ◽  
Foam Pattern ◽  
Lost Foam

The combination of Aluminum alloy with lost foam casting (LFC) process is best applied in automotive industry to replace steel components in order to achieve light weight components for reducing fuel consumption and to protect the environment. The LFC process involves process parameters such as the degree of vacuum, foam degradation, expanded polystyrene (EPS) foam density, permeability of foam pattern coatings, pouring temperature, filling velocity, cooling rate, and pressure. The effect of polystyrene foam pattern coating thickness on the porosity and mechanical properties of Aluminum Al-Si LM6 alloy were evaluated experimentally. The coating thickness was controlled by slurry viscosity at range between 18sec to 20sec using Zahn viscosity cup No.5 and the foam pattern was coated up to fifth layer. Aluminum Al-Si (LM6) molten metal was poured into expandable mould and castings were examined to determine porosity distribution, mechanical properties and microscopic observation. Results from X-ray testing reveal the porosity distribution on Aluminum Al-Si LM6 castings is greater at thicker foam pattern coating sample. Meanwhile, the tensile strength of casting decreases when foam pattern coating thickness increases. Microscope observation portray the present of porosity on the casting which shows more gas defects present at thicker foam pattern coating sample. The source of porosity in LFC process is due to air entrainment or the entraining gases from polystyrene foam decomposition during pouring of molten metal. As a conclusion, mechanical strength has inverse relationship with porosity.

Mechanical Properties of A6063/SiC Composites Produced Using the Lost Foam Casting Process

2012 ◽  
Vol 54 (3) ◽  
pp. 189-192
Author(s):  
Kerem Altug Güler ◽  
Alptekin Kisasoz ◽  
Caglar Yuksel ◽  
Ahmet Karaaslan
Keyword(s):  
Mechanical Properties ◽  
Casting Process ◽  
Lost Foam Casting ◽  
Sic Composites ◽  
Lost Foam

Influence of strain rate on the mechanical properties in fine-grained aluminum alloys

1995 ◽  
Vol 204 (1-2) ◽  
pp. 12-18 ◽  
Author(s):  
Toshiji Mukai ◽  
Koichi Ishikawa ◽  
Kenji Higashi
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Strain Rate ◽  
Fine Grained
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