Study of Solidification Time and Solidus Velocity on Porosity Formation in High Strength Aluminum Alloy Castings

2014 ◽  
Vol 575 ◽  
pp. 442-445
Author(s):  
Yeong Sant Kuo
Keyword(s):  
Aluminum Alloy ◽  
High Strength ◽  
Solidification Time ◽  
Local Solidification Time ◽  
Silica Sand ◽  
Systematic Change ◽  
Porosity Formation ◽  
Alloy Plate ◽  
High Strength Aluminum Alloy ◽  
Alloy Castings

The purpose of the present study was to discuss the effects of local solidification time and solidus velocity on porosity formation in high strength aluminum alloy casting. With systematic change in the riser size, together with variation of thickness and length, A201 aluminum alloys were cast in 100% silica sand molds. The porosity content of A201 aluminum alloy was affected by the local solidification time and solidus velocity in this study. The correlation between porosity content and solidification time is found to be split into 2 bands, each being associated with one of the two thicknesses of plate castings. The longer the solidification time, the more the porosity content was measured in the A201 aluminum alloy plate casting. And the faster the solidus velocity, the more the porosity content in this study. The porosity content of A201 aluminum alloy was influenced by both of solidification time and solidus velocity at same time in this study. Basically, shorter local solidification time with slow solidus velocity seems get lower porosity content in A201 aluminum alloy castings.

Effects of Solidification Time on Porosity Content in A201 Aluminum Alloy Castings

2011 ◽  
Vol 311-313 ◽  
pp. 648-652 ◽  
Author(s):  
Yeong Sant Kuo
Keyword(s):  
Aluminum Alloy ◽  
Solidification Time ◽  
Local Solidification Time ◽  
Silica Sand ◽  
Systematic Change ◽  
Alloy Plate ◽  
Solidification Range ◽  
Aluminum Alloy Plate ◽  
Alloy Castings

The purpose of the present study was to discuss the effects of local solidification time on porosity content of long solidification range A201 aluminum alloy plate castings. With systematic change in the riser size, together with variation of thickness and length, were cast in different kinds of molds. The sand molds with end chill for the plate castings were made of 100% silica sand. The porosity content of A201 aluminum alloy was affected by the local solidification time in this study. The correlation between porosity content and solidification time is found to be split into 2 bands, each being associated with one of the two thickness of plate castings.

Effects of Thermal Gradient and Solidification Time on Porosity Content of A201 Aluminum Alloy Castings

2012 ◽  
Vol 503-504 ◽  
pp. 597-600
Author(s):  
Y.S Kuo
Keyword(s):  
Aluminum Alloy ◽  
Thermal Gradient ◽  
Thermal Parameter ◽  
Solidification Time ◽  
Local Solidification Time ◽  
Silica Sand ◽  
Systematic Change ◽  
Alloy Plate ◽  
Aluminum Alloy Plate ◽  
Alloy Castings

The purpose of the present study was to discuss the effects of local solidification time and thermal gradient on porosity content in long solidification range A201 aluminum alloy plate castings. With systematic change in the riser size, together with variation of thickness and length, were cast in different kinds of molds. The sand molds with end chill for the plate castings were made of 100% silica sand. The porosity content of A201 aluminum alloy was affected by the local solidification time and thermal gradient at same time in this study. The correlation between porosity content and any individual thermal parameter is found to be split into 2 bands, each being associated with one of the two thicknesses of plate castings. The higher the thermal gradient, the lower the porosity content was measured in the A201 aluminum alloy plate casting. And high thermal gradient with short solidification time will get lower porosity content in aluminum alloy castings

Study of Solidus Velocity on Porosity Formation in A201 Aluminum Alloy Castings

2013 ◽  
Vol 705 ◽  
pp. 223-227
Author(s):  
Y.S. Kuo
Keyword(s):  
Aluminum Alloy ◽  
Silica Sand ◽  
Systematic Change ◽  
Porosity Formation ◽  
Alloy Plate ◽  
Aluminum Alloy Plate ◽  
Alloy Castings ◽  
Different Thickness

The purpose of the present study was to discuss the effects of solidus velocity on porosity formation of A201 aluminum alloy plate castings. With systematic change in the riser size, together with variation of thickness and length, were cast in sand molds. The sand molds with end chill for the plate castings were made of 100% silica sand. The porosity content of A201 aluminum alloy was affected by the solidus velocity in this study. The correlation between porosity content and solidus velocity is found to be split into 2 bands, each being associated with one of the different thickness of plate castings.

Mechanical Properties and Porosity Content of A201 Aluminum Alloy Castings in Different Cooling Rate Sand Molds

2010 ◽  
Vol 154-155 ◽  
pp. 787-793 ◽  
Author(s):  
Yeong Sant Kuo
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Cooling Rate ◽  
Silica Sand ◽  
Systematic Change ◽  
Type B ◽  
Alloy Plate ◽  
Aluminum Alloy Plate ◽  
Alloy Castings ◽  
Sand Type

A201 aluminum alloy plate castings with systematic change in the riser size, together with variation of thickness and length, were cast in different kinds of molds to find out the influence of cooling rate on the mechanical properties and porosity content. The sand molds with end chill for the plate castings were made of 100% silica sand (type A mold), 50%silica sand/50% chromite sand (type B mold) and 100% chromite sand (type Cmold). Both the porosity content and mechanical properties of A201 aluminum alloy plate casting are governed by the cooling rate. Both of tensile strength and elongation are reduced when the porosity content becomes more.

Influences of Thermal Gradient and Solidus Velocity on Porosity Content in A201 Aluminum Alloy Castings

2014 ◽  
Vol 496-500 ◽  
pp. 255-258
Author(s):  
Yeong Sant Kuo
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Thermal Gradient ◽  
Silica Sand ◽  
Systematic Change ◽  
Alloy Plate ◽  
High Thermal Gradient ◽  
Lower Porosity ◽  
Aluminum Alloy Plate ◽  
Alloy Castings

With systematic change in the riser size, together with variation of thickness and length, A201 aluminum alloys were cast in 100% silica sand molds. The higher the thermal gradient, the lower the porosity content was measured in the A201 aluminum alloy plate casting. And the faster the solidus velocity, the more the porosity content in this study. The porosity content of A201 aluminum alloy was influenced by both of thermal gradient and solidus velocity at same time in this study. Basically, high thermal gradient with slow solidus velocity seems get lower porosity content in A201 aluminum alloy castings.

Effects of Casting Geometry on the Mechanical Properties of A201 Aluminum Alloy Castings in Chromite Sand Molds

2015 ◽  
Vol 1104 ◽  
pp. 149-153
Author(s):  
Yeong Sant Kuo
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Systematic Change ◽  
Alloy Plate ◽  
Proper Design ◽  
Aluminum Alloy Plate ◽  
Alloy Castings

Systematic change of riser size together with variation of thickness and length of A201 aluminum alloy plate castings were studied to investigate the correlation between mechanical properties and porosity content. The molds with end chill for plate castings were made of 100% chromite sand by CO2 process. If soundness throughout the whole plate casting has to be guaranteed, the riser diameter should be proper design to the dimension of the plate. The tensile strength and elongation of A201 aluminum alloy plate casting is governed by riser diameter, thickness, and length of the plate.

Analysis of Porosity Characteristics in Weld Metal of High Strength Aluminum Alloy and the Effect of Mixed Shielding Gas

2005 ◽  
Vol 475-479 ◽  
pp. 309-312 ◽  
Author(s):  
Xiao Mu Zhang ◽  
Zhi Yong Zhang ◽  
Yun Peng ◽  
Zhi Ling Tian ◽  
Chang Hong He ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Weld Metal ◽  
Welded Joint ◽  
High Strength ◽  
Mig Welding ◽  
Shielding Gas ◽  
Mixed Gas ◽  
Porosity Formation ◽  
High Strength Aluminum Alloy ◽  
Softened Zone

Aluminum alloy has being widely used in modern automobile and aeronautic industry. However, the welding of aluminum alloy, especially high strength aluminum alloy，is difficult. Porosities are usually brought in the weld metal. In this paper, MIG welding using mixed gas shielding is carried out. The characteristic shapes of porosity in weld metal are described, the mechanism of porosity formation is analyzed, and the factors that influence the tendency of porosity formation are studied. Experiment results indicate that by the use of mixed shielding gas of 38%He+62%Ar, the number of porosity is reduced, the width of HAZ and softened zone is decreased, and the mechanical properties of welded joint is increased.

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