Mechanical Properties and Microstructure of Thin Plates of A6061 Wrought Aluminum Alloy Using Rheology Forging Process with Electromagnetic Stirring

2013 ◽  
Vol 45 (3) ◽  
pp. 1068-1080 ◽  
Author(s):  
Chul Kyu Jin ◽  
Amir Bolouri ◽  
Chung Gil Kang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Electromagnetic Stirring ◽  
Thin Plates ◽  
Forging Process ◽  
Wrought Aluminum

Mechanical Properties and Microstructure of Aluminum Alloy Al-6061 Obtained by the Liquid Forging Process

2010 ◽  
Vol 654-656 ◽  
pp. 1420-1423 ◽  
Author(s):  
Chun Wei Su ◽  
Peng Hooi Oon ◽  
Y.H. Bai ◽  
Anders W.E. Jarfors
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aluminum Alloy ◽  
Treatment Process ◽  
Forging Process ◽  
Al 6061 ◽  
Casting Alloys ◽  
Suitable Heat Treatment ◽  
Structural Applications ◽  
Wrought Aluminum

The liquid forging process has the flexibilities of casting in forming intricate profiles and features while imparting the liquid forged components with superior mechanical strength compared to similar components obtained via casting. Additionally, liquid forging requires significantly lower machine loads compared to solid forming processes. Currently, components that are formed by liquid forging are usually casting alloys of aluminum. This paper investigates the suitability of liquid forging a wrought aluminum alloy Al-6061 and the mechanical properties after forming. The proper handling of the Al-6061 alloy in its molten state is important in minimizing oxidation of its alloying elements. By maintaining the correct alloying composition of Al-6061 after liquid forging, these Al-6061 samples can subsequently undergo a suitable heat treatment process to significantly improve their yield strengths. Results show that the yield strengths of these liquid forged Al-6061 samples can be increased from about 90MPa, when they are in the as-liquid forged state, to about 275MPa after heat treatment. This improved yield strength is comparable to that of Al-6061 samples obtained by solid forming processes. As such, the liquid forging process here has been shown to be capable of forming wrought aluminum alloy components that has the potential for structural applications.

The Effect of Applied Forging Pressure on Primary Structure Deformation in Rheology Forging Process With Solid Fraction Controlled A356 and AA2024 Alloys

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
S. M. Lee ◽  
H. H. Kim ◽  
C. G. Kang
Keyword(s):  
Aluminum Alloy ◽  
Electromagnetic Stirring ◽  
Cast Aluminum Alloy ◽  
Cast Aluminum ◽  
Structure Deformation ◽  
Forging Process ◽  
Heat Treated ◽  
Primary Particles ◽  
Liquid Segregation ◽  
Wrought Aluminum

Mechanical properties and microstructure of heat-treated samples of A356 and AA2024 aluminum alloys, which were rheoforged by varying the change in pressure and temperature were investigated, preventing defects such as porosity, liquid segregation, and insufficient filling occurring during rheoforging process. The rheology material was fabricated by an electromagnetic stirring process by controlling stirring current so that shearing force and temperature of the molten metal were controlled during electromagnetic stirring. As a result, by crushing dendrite and rosette type microstructures, fine and globularized rheology material was obtained and the feasibility of the rheoforging process was found to be positive. In the case of the direct rheoforging process, excessive applied forging-pressure caused material spattering, which in turn caused eutectic segregation. This segregation brought about a shrink hole and thus led to a deterioration of mechanical strength. According to varied applied forging pressures, agglomeration phenomena of primary particles of wrought aluminum alloy remarkably increased as compared with an as-cast aluminum alloy.

Forging Process of Wrought Aluminum Alloy with Controlled Solid Fraction by Electromagnetic Stirring

2008 ◽  
Vol 141-143 ◽  
pp. 277-282 ◽  
Author(s):  
J.W. Bae ◽  
S.M. Lee ◽  
Chung Gil Kang
Keyword(s):  
Mechanical Properties ◽  
Electromagnetic Stirring ◽  
Good Mechanical Property ◽  
Pouring Temperature ◽  
Forging Process ◽  
Globular Microstructure ◽  
Liquid Phases ◽  
Liquid Segregation ◽  
Wrought Aluminum Alloys ◽  
Wrought Aluminum

This study demonstrates the indirect rheoforging of wrought aluminum alloys fabricated by electromagnetic stirring (EMS). EMS was carried out by varying pouring temperature of theological material and subsequently the rheo-material was forged into the sample which consisted of the direct and indirect forging part, by varying the applied forging pressure. The rheo-material completely filled the die cavity at the applied forging pressure of 150 MPa. To transfer the densification pressure to the end of the part, the applied forging pressure of over 170 MPa was necessary. To control liquid segregation, solid and liquid phases distribute uniformly by deriving the laminar flow. When liquid segregation occurred significantly during rheoforging, the strength revealed as low as 268 MPa. Investigating relationship between microstructural features and mechanical properties of the product, the rheoforged material through EMS revealed the fine and globular microstructure. Microstructure with uniform distribution of solid and liquid phase (no segregation) showed good mechanical property of the rheoforged material whose tensile strength was 341 MPa for Al6061.

Fabrication of Rheological Material of A356 Aluminum Alloy by Electromagnetic Stirring through Vacuum Pump

2008 ◽  
Vol 141-143 ◽  
pp. 731-736
Author(s):  
H.H. Kim ◽  
S.M. Lee ◽  
C.G. Kang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Atmospheric Pressure ◽  
Vacuum Pump ◽  
Electromagnetic Stirring ◽  
Vacuum Pressure ◽  
A356 Aluminum Alloy ◽  
Forging Process ◽  
A356 Aluminum

This study demonstrates fabricating rheological material by EMS system attached vacuum pump, in order to improve mechanical properties of rheoforged products by removing defects such as porosity and oxides arising from rheological forging process. The billet fabricated by EMS in vacuum pressure reduced formation of oxides and porosities of the inner material. The billet fabricated by EMS in vacuum pressure below 56 cm/Hg remarkably reduced porosities, comparing to the EMS in atmospheric pressure.

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