Effects of Pouring Temperature and Electromagnetic Stirring on Porosity and Mechanical Properties of A357 Aluminum Alloy Rheo-Diecasting

2018 ◽  
Vol 27 (5) ◽  
pp. 2373-2380 ◽  
Author(s):  
An Guo ◽  
Junwen Zhao ◽  
Chao Xu ◽  
Hu Li ◽  
Jing Han ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Electromagnetic Stirring ◽  
Pouring Temperature ◽  
A357 Aluminum Alloy

Effect of UDC Casting on Hot Deformation Behavior and Properties of 2A14 Aluminum Alloy

2019 ◽  
Vol 944 ◽  
pp. 46-51 ◽  
Author(s):  
Yang Qiu ◽  
Zhi Feng Zhang ◽  
Hao Dong Zhao ◽  
Bao Li ◽  
Chun Sheng Chen
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Deformation Behavior ◽  
Direct Chill ◽  
Electromagnetic Stirring ◽  
Ring Rolling ◽  
Compression Tests ◽  
Hot Deformation Behavior ◽  
Dislocation Glide ◽  
Dominant Deformation Mechanism

Uniform direct chill (UDC) casting is coupled annular electromagnetic stirring and intercooling, having been utilized for the preparation of large-sized aluminum alloy billet. In this paper, the UDC casting was applied to 2A14 aluminum alloy billets with a diameter of 584 mm. Hot compression tests, cogging and ring rolling procedures were carried out for the billets, respectively. The results show that during the deformation temperature of 420 °C and the strain rate of 0.01 s−1 to 10 s−1, the flow stresses of different positions are higher and more stable in the UDC casting billet than in the normal direct chill (NDC) casting billet. The dislocation glide is the dominant deformation mechanism of 2A14 aluminum alloy. Meanwhile, the UDC casting significantly improves the mechanical properties of the rolled rings in tangential and axial directions compared with the NDC casting.

Influence of Different Pouring Temperature to Properties and Organization of A356 Aluminum Alloy under Specified Conditions

2013 ◽  
Vol 749 ◽  
pp. 119-124
Author(s):  
Li Li Zhao ◽  
Lv Ming Yang ◽  
Tie Tao Zhou
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Production Efficiency ◽  
Quantitative Relationship ◽  
High Strength ◽  
Mold Temperature ◽  
Production Equipment ◽  
Main Element ◽  
Pouring Temperature ◽  
A356 Aluminum

Due to the excellent casting performance, good corrosion resistance, high strength and casting manufacturing costs, A356 casting aluminum alloy is widely used in automobile wheel industry of China. However, for the restrictions of the production equipment, technology and the production craft level, there are problems that product quality is not satisfied and the production efficiency is low in the mass manufacturing. In this paper, the effect of pouring temperature and mold temperature on the microstructure and mechanical properties were investigated on the basis of cooperation project with Bin Zhou wheel hub manufacturing company. The quantitative relationship between mechanical properties and microstructure was studied by statistical methods. The results indicate that pouring temperature is the main element to affect the mechanical properties of permanent mold casting A356 and the optimum pouring process parameter is about 744 .Mechanical properties have a liner relationship with secondary dendrite arm spacing in a certain extent.

scholarly journals Green Sand Mould Production of Aluminum Alloy Bimetallic Castings

2020 ◽  
Vol 13 (3) ◽  
Author(s):  
B.V. Omidiji ◽  
B.O. Malomo ◽  
A. Aronsoro ◽  
D.A. Adetan
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Hot Spots ◽  
Al Alloys ◽  
Gating System ◽  
Green Sand ◽  
Pouring Temperature ◽  
Sand Mould ◽  
Hardness Values

A green sand moulding system was applied to produce alumunum alloy bimetallic castings. Al alloys 6101 and 242 were combined in the production of the bimetals. Mould firing temperature, pouring temperature and grain fineness number taken at three levels were the parameters used in the study. This was done to know the number of times the experiments would be run using L9 orthogonal array of Taguchi’s approach to design of experiment. Nine experiments were conducted in all, taking into cognisance the role of design of gating system for each of the castings to avoid turbulence. UTS and hardness values were determined as core mechanical properties of the components. There was a down trend of the values as the values of the process parameters increased. However, there were exceptions to this pattern of behaviour perhaps some hot spots were in the castings that exhibited the kind of behaviour.

Semi-Solid 6061 Aluminum Alloy Slurry Prepared by Serpentine Channel Pouring Process and its Rheo-Diecasting

2022 ◽  
Vol 327 ◽  
pp. 279-286
Author(s):  
Nai Yong Li ◽  
Wei Min Mao ◽  
Xiao Xin Geng ◽  
Peng Yu Yan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Ductile Fracture ◽  
Fracture Mechanism ◽  
Pouring Temperature ◽  
6061 Aluminum Alloy ◽  
Serpentine Channel ◽  
Die Cast ◽  
Semi Solid

Semi-solid 6061 aluminum alloy slurry was prepared by a graphite serpentine channel and its rheo-diecasting experiment was carried out on the slurry. The influence of pouring temperature on the microstructure evolution and mechanical properties of the rheo-diecasting were investigated. The microstructure and fracture mechanism of traditional die cast tensile specimens and rheo-diecast tensile specimens were compared and investigated. The results indicate that the microstructure of rheo-diecast tensile specimens is composed of spherical primary α-Al grains and fine secondary solidified α2-Al grains. When the pouring temperature increased from 660 °C to 720 °C, the average equivalent grain diameter of primary α-Al grains increased from 42 μm to 58 μm, and the shape factor decreased from 0.82 to 0.73. As the pouring temperature increases, the as-cast tensile strength and elongation of tensile specimens both increase first and then decrease. When the pouring temperature was 690 °C, the best mechanical properties were obtained, with as-cast tensile strength of 142.93 MPa and as-cast elongation of 4.86%. The fracture mechanism of traditional die casting is mainly ductile fracture, and the fracture mechanism of rheo-diecasting is a mixed fracture of intergranular fracture and ductile fracture.

Microstructure Evolution and Mechanical Properties of Rheocast A319 Aluminum Alloy Using Cooling Slope

2014 ◽  
Vol 663 ◽  
pp. 261-265
Author(s):  
M.S. Salleh ◽  
M.Z. Omar ◽  
Junaidi Syarif ◽  
M.N. Mohammed ◽  
K.S. Alhawari
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Automotive Industry ◽  
Primary Phase ◽  
Pouring Temperature ◽  
Cooling Slope ◽  
Subsequent Separation ◽  
A319 Alloy ◽  
Slope Wall ◽  
Cast Condition

A319 aluminum alloys are commonly used in automotive industry due to a combination of good fluidity and mechanical strength. In this present work, cooling slope (CS) rheocasting process was employed to produce A319 billets with near spherical morphology of primary Al phase. The dendritic primary phase in the cast A319 alloy had readily transformed into non-dendritic when the ingots were cast over a cooling plate from pouring temperatures between 620°C and 640°C and with cooling lengths of between 300 mm and 400 mm. The shear driven flow of the solidifying melt on the cooling slope wall promotes heterogeneous nucleation of α-Al phase and subsequent separation from there due to shear driven flow of the solidifying melt produced nearly spheroidal morphology of the primary phase in the microstructure. The results show that the best combination of pouring temperature and cooling length was found to be 630°C and 400 mm respectively. The hardness of the rheocast ingots improved to 85.3 HV from 81.8 HV in as-cast condition.

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.

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