Criterion for oxides silumin castings contamination during chill casting

2021 ◽  
pp. 99-103
Author(s):  
O.A. Zarubina ◽  
A.M. Zarubin
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Oxide Films ◽  
Casting Process ◽  
Chill Casting ◽  
Oxidation Processes ◽  
Mould Filling ◽  
Gas Tight ◽  
Cast Products ◽  
Modern Computing

To assess the effect of the mould filling modes on the content of oxide films in castings, special criterion is proposed that provides prediction in the contamination of chill castings mаde of aluminum alloys by using modern computing tools to simulate the moulds casting process on computer. It is noted that decrease in the value of the contamination criterion by using alloys with low content of Mg or without this component reduces the possibility of controlling the distribution of oxides in the casting, other elements of the casting mould and using the concentration of oxides, for example, in washers to control the mechanical properties of cast products. This is due to increase in the duration of oxidation processes in gas-tight mould with such change in the composition of the casting material.

The Effect of Microalloying of Nickel, RRA Treatment on Microstructure and Mechanical Properties for High Strength Aluminum Alloy

2014 ◽  
Vol 925 ◽  
pp. 253-257 ◽  
Author(s):  
Haider T. Naeem ◽  
Kahtan S. Mohammad ◽  
Khairel R. Ahmad
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
High Strength ◽  
Casting Process ◽  
Direct Chill ◽  
Heat Treatments ◽  
Alloy Sample ◽  
Retrogression And Reaging ◽  
High Strength Aluminum Alloys ◽  
Direct Chill Casting Process

High strength aluminum alloys Al-Zn-Mg-Cu-(0.1) Ni produced by semi-direct chill casting process were homogenized at different conditions then conducted heat treatment process which comprised pre-aging at 120°C for 24 h, retrogression at 180°C for 30 min, and then re-aging at 120°C for 24 h. Microstructural studies showed that add Ni (0.1 wt %) to the alloy will be forming Ni-rich phases such as AlCuNi, AlNi, AlNiFe and AlMgNi which provide a dispersive strengthening affected in the solid-solution and the subsequent heat treatments. The results showed that by this three-step process of heat treatments, the mechanical properties of aluminum alloys Al-Zn-Mg-Cu-(0.1) Ni were substantially improved. The highest attain for the ultimate tensile strength and Vickers hardness for the alloy sample after applied the retrogression and reaging process is about 545 MPa and 237 HV respectively.

Microstructure and Mechanical Properties of Al Alloys by Semi-Solid Processing with LSPSF Technology

2009 ◽  
Vol 628-629 ◽  
pp. 477-482 ◽  
Author(s):  
Hong Min Guo ◽  
Xiang Jie Yang ◽  
J.X. Wang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Die Casting ◽  
High Strength ◽  
Casting Process ◽  
Homogeneous Distribution ◽  
Casting Alloy ◽  
Die Casting Process ◽  
Casting Industry ◽  
Semi Solid

Rheoforming is becoming the choice of the casting industry which relies on the semi-solid slurry for high integrity structural parts. The potential of rheoforming with LSPSF (Low superheat pouring with a shear field) for aluminum alloys was investigated in the present work. High quality semi-solid slurries of a series of aluminum alloys were manufactured by LSPSF process, such as casting alloy A356, high strength alloy 201, secondary die casting alloy A380 and wrought alloy 2024, 6082 and 7075, in which the primary α-Al presented spherical, small and homogeneous distribution, especially with zero-entrapped liquid. Applications of LSPSF in high pressure die casting process and squeeze casting process were presented. Results showed that LSPSF rheoforming could improve microstructures and increase mechanical properties.

On the complexity of the relationship between microstructure and tensile properties in cast aluminum

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540011 ◽  
Author(s):  
Anton Bjurenstedt ◽  
Salem Seifeddine ◽  
Anders E. W. Jarfors
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
High Performance ◽  
Casting Process ◽  
Process Quality ◽  
Material Strength ◽  
Process Conditions ◽  
Cast Aluminum ◽  
Handling Practices ◽  
The Relationship

The relationship between microstructure and mechanical properties in cast aluminum alloys is complex and is strongly affected by the casting process conditions and melt handling practices. The aim of the current work is to understand the critical interactions between material microstructure, mechanical properties and process quality in the development of high performance aluminum alloys. The mechanical properties were investigated and correlated with microstructural features such as porosity, Fe -rich particles, secondary dendrite arm spacing (SDAS) and Si -particle length. The correlation with process quality measures such as bifilm index, density index and sludge factor (SF) were also investigated. The Si -particle lengths were found to explain variation in material strength and ductility which factors such as the bifilm index and porosity could not.

scholarly journals Effect of Casting Conditions on the Fracture Strength of Al-5 Mg Alloy Castings

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Fawzia Hamed Basuny ◽  
Mootaz Ghazy ◽  
Abdel-Razik Y. Kandeil ◽  
Mahmoud Ahmed El-Sayed
Keyword(s):  
Mechanical Properties ◽  
Oxide Film ◽  
Oxide Films ◽  
Bulk Liquid ◽  
Sand Cast ◽  
Mould Filling ◽  
Surface Turbulence ◽  
Film Content ◽  
Cast Alloys ◽  
Alloy Castings

During the transient phase of filling a casting running system, surface turbulence can cause the entrainment of oxide films into the bulk liquid. Previous research has suggested that the entrained oxide film would have a deleterious effect on the reproducibility of the mechanical properties of Al cast alloys. In this work, the Weibull moduli for the ultimate tensile strength (UTS) and % elongation of sand cast bars produced under different casting conditions were compared as indicators of casting reliability which was expected to be a function of the oxide film content. The results showed that the use of a thin runner along with the use of filters can significantly eliminate the surface turbulence of the melt during mould filling which would lead to the avoidance of the generation and entrainment of surface oxide films and in turn produce castings with more reliable and reproducible mechanical properties compared to the castings produced using conventional running systems.

Mechanical Properties of Large-Scale Extruded Mg-Zn-Y Alloys

2010 ◽  
Vol 638-642 ◽  
pp. 1541-1545 ◽  
Author(s):  
Yuichi Ienaga
Keyword(s):  
Mechanical Properties ◽  
Fatigue Strength ◽  
Aluminum Alloys ◽  
Large Scale ◽  
High Strength ◽  
Casting Process ◽  
High Heat ◽  
Stir Casting ◽  
Extrusion Ratio ◽  
High Heat Resistance

In order to realize large-scale Mg-Zn-Y alloys with high strength and high heat resistance, we have developed a unique casting process to produce a large homogeneous ingot investigating the mechanical properties of the extruded alloys. First homogeneous ingots (335 mm x 850 mm) were prepared by a unique stir casting process. Then large-scale extruded alloys (100 mm) were prepared at 648 K with the extrusion ratio of 10. The Mg-Zn-Y alloys have exhibited higher yield and fatigue strengths than those of aluminum alloys. The yield strengths of the aluminum alloys have decreased drastically above 473 K, whereas those of the Mg-Zn-Y alloys have not. It is noteworthy that the yield strength (200 MPa) and the fatigue strength (75 MPa) of the Mg-Zn-Y alloys at 523 K are about twice and 1.2-1.4 times as high as those of the aluminum alloys respectively. Moreover, the creep strengths have been equivalent or higher than those of aluminum alloys. From the above results, we have verified that even being made by the large-scale extrusion, the Mg-Zn-Y alloys possess higher strength than those of heat resistant aluminum alloys.

The Effect of Ultrasonic Injection on the Microstructure and Mechanical Properties of A356 Alloy

2010 ◽  
Vol 638-642 ◽  
pp. 3960-3965 ◽  
Author(s):  
Byoung Il Kang ◽  
Dae Gyun Ko ◽  
Jeong Il Youn ◽  
Young Jig Kim
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
A356 Alloy ◽  
Casting Process ◽  
Primary Phase ◽  
Eutectic Phase ◽  
Research Activities ◽  
Plate Shape ◽  
Casting Aluminum ◽  
Intense Research

A356 alloy is one of the wide used casting aluminum alloys and intense research activities of worldwide on casting process or refinement agent and procedure. In this study, we attempted refinement on Al primary phase and eutectic phase of A356 alloy by ultrasonic injection into the melts. The effect of ultrasonic injection into the melts could be summarized as follows: the morphology of the Al primary phase was refined and changed shape from dendritic to nondendritic and the eutectic phase of A356 was also refined and changed morphology from dendritic to plate shape.

Microstructure and Mechanical Properties of Castings under Vibration Techniques - A Review

2014 ◽  
Vol 550 ◽  
pp. 71-80
Author(s):  
N. Suresh ◽  
P. Chandrasekar
Keyword(s):  
Mechanical Properties ◽  
Fluid Flow ◽  
Material Science ◽  
Cost Savings ◽  
Casting Process ◽  
Design And Manufacturing ◽  
Cast Product ◽  
External Forces ◽  
Cast Products

The challenging problems for designers and engineers in the material science are to enhance the quality of the castings. The several numbers of methods using external forces have been applied to introduce fluid flow during solidification of molten metal in casting process. These include mechanical, electromagnetic and ultrasonic vibration. Many technical journals describe the improvement in mechanical properties of castings under the vibration during solidification. In this paper, an attempt has been made to review the casting process to refine the microstructure of cast product. The awareness gain of these processes and application of the procedures offer the scope for better cost savings in design and manufacturing of cast products.

The Effect of Ultrasonic Injection on the Microstructure and Mechanical Properties of A356 Alloy

2010 ◽  
Vol 89-91 ◽  
pp. 285-289
Author(s):  
Byoung Il Kang ◽  
Dae Gyun Ko ◽  
Jeong Il Youn ◽  
Young Jig Kim
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
A356 Alloy ◽  
Casting Process ◽  
Primary Phase ◽  
Eutectic Phase ◽  
Research Activities ◽  
Plate Shape ◽  
Casting Aluminum ◽  
Intense Research

A356 alloy is one of the wide used casting aluminum alloys and intense research activities of worldwide on casting process or refinement agent and procedure. In this study, we attempted refinement on Al primary phase and eutectic phase of A356 alloy by ultrasonic injection into the melts. The effect of ultrasonic injection into the melts could be summarized as follows: the morphology of the Al primary phase was refined and changed shape from dendritic to nondendritic and the eutectic phase of A356 was also refined and changed morphology from dendritic to plate shape.

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