scholarly journals Hypoeutectic Al-Si Alloy with Cr, V and Mo to Pressure Die Casting

2017 ◽  
Vol 17 (1) ◽  
pp. 153-156
Author(s):  
T. Szymczak ◽  
G. Gumienny ◽  
I. Stasiak ◽  
T. Pacyniak
Keyword(s):  
Crystallization Process ◽  
Die Casting ◽  
Intermetallic Phases ◽  
Casting Alloys ◽  
Large Size ◽  
Master Alloys ◽  
Dta Curves ◽  
Die Castings ◽  
Pressure Die Casting ◽  
Made In

Abstract This paper presents the results of hypoeutectic 226 grade alloy as well as prepared on its basis Al-Si alloy containing Cr, V and Mo. The additives tested were added as AlCr15, AlV10 and AlMo8 master alloys. Alloys tested were poured into DTA sampler as well as using pressure die casting. An amount of Cr, V and Mo additives in alloy poured into DTA sampler comprised within the range approximately 0.05-0.35%. Alloys to pressure die casting contained 0.05-0.20% Cr, V and Mo. The crystallization process was examined using the derivative thermal analysis (DTA). The microstructure of castings made in the DTA sampler as well as castings made with use of pressure die casting were examined. The basic mechanical properties of castings made using pressure die casting were defined too. It has been shown in the DTA curves of Al-Si alloy containing approximately 0.30 and 0.35% Cr, Mo, and V there is an additional thermal effect probably caused by a peritectic crystallization of intermetallic phases containing the aforementioned additives. These phases have a morphology similar to the walled and a relatively large size. The analogous phases also occur in pressure die casting alloys containing 0.10% or more additions of Cr, V and Mo. The appearance of these phases in pressure die casting Al-Si alloys coincides with a decrease in the value of the tensile strength Rm and the elongation A. It has been shown die castings made of Al-Si alloys containing the aforementioned additives have a higher Rm and A than 226 alloy.

scholarly journals Hypoeutectic Silumin to Pressure Die Casting with Vanadium and Tungsten

2016 ◽  
Vol 61 (4) ◽  
pp. 2103-2110
Author(s):  
T. Szymczak ◽  
G. Gumienny ◽  
T. Pacyniak
Keyword(s):  
Mechanical Properties ◽  
Crystallization Process ◽  
Metallographic Analysis ◽  
Similar Shape ◽  
Die Cast ◽  
Dta Studies ◽  
Die Castings ◽  
Pressure Die Casting ◽  
Made In ◽  
And Tungsten

AbstractThe basic aim of this study is to investigate the effect of vanadium and tungsten on the crystallization process, microstructure and mechanical properties of silumin grade EN-AC 46000. The research involved a derivative thermal analysis DTA of the crystallization process, the metallographic analysis as well as the mechanical properties. The metallographic analysis was carried out on pressure die castings and made in the DTA probe. Vanadium and tungsten were added simultaneously to silumin in amount of approximately 0.1; 0.2; 0.3 and 0.4%. The DTA studies have shown the similar shape of all crystallization curves. It has been shown the additives of vanadium and tungsten in pressure die cast silumin can significantly increase its tensile strength as an well as elongation.

COPPER ALLOY No. 878

Alloy Digest ◽  
1979 ◽  
Vol 28 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Copper Alloy ◽  
Die Casting ◽  
Heat Treating ◽  
Casting Alloys ◽  
Copper Zinc ◽  
Die Castings ◽  
Very High

Abstract Copper Alloy No. 878 is a copper-zinc-silicon alloy for die castings. Among the brass die-casting alloys, it has the highest strength, hardness and wear resistance; however, it is the most difficult to machine. It is used where very high requirements must be met for strength and wear resistance. Its many applications include tools, pump impellers, gears and marine hardware. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Cu-386. Producer or source: Copper alloy producers.

scholarly journals Effect of Cr and W on the Crystallization Process, the Microstructure and Properties of Hypoeutectic Silumin to Pressure Die Casting

2016 ◽  
Vol 16 (3) ◽  
pp. 109-114 ◽  
Author(s):  
T. Szymczak ◽  
G. Gumienny ◽  
T. Pacyniak
Keyword(s):  
Mechanical Properties ◽  
Crystallization Process ◽  
Die Casting ◽  
Intermetallic Phase ◽  
Small Extent ◽  
Metallographic Analysis ◽  
Higher Temperature ◽  
Dta Studies ◽  
Pressure Die Casting ◽  
Additional Phase

Abstract This article presents the results of studies in the hypoeutectic silumin destined for pressure die casting with the simultaneous addition of chromium and tungsten. The study involved the derivative and thermal analysis of the crystallization process, metallographic analysis and mechanical properties testing. Silumin 226 grade was destined for studies. It is a typical silumin to pressure die casting. AlCr15 and AlW8 preliminary alloys were added to silumin. Its quantity allowed to obtain 0.1, 0.2, 0.3 and 0.4% of Cr and W in the tested alloy. Studies of the crystallization process as well as the microstructure of the silumin poured into DTA sampler allowed to state the presence of additional phase containing 0.2% or more Cr and W. It has not occurred in silumin without the addition of above mentioned elements. It is probably the intermetallic phase containing Cr and W. DTA studies have shown this phase crystallizes at a higher temperature range than α (Al) solid solution. In the microstructure of each pressure die casting containing Cr and W the new phases formed. Mechanical properties tests have shown Cr and W additives in silumin in an appropriate amount may increase its tensile strength Rm (about 11%), the yield strength Rp0.2 (about 21%) and to a small extent elongation A.

The Influence of Intensification Pressure on the Gate Microstructure of AlSi3MgMn High Pressure Die Castings

2009 ◽  
Vol 618-619 ◽  
pp. 607-610 ◽  
Author(s):  
Somboon Otarawanna ◽  
Christopher M. Gourlay ◽  
Hans Ivar Laukli ◽  
Arne K. Dahle
Keyword(s):  
High Pressure ◽  
Die Casting ◽  
Shear Bands ◽  
Strain Localisation ◽  
Solidification Shrinkage ◽  
Intensification Pressure ◽  
Microstructural Characterisation ◽  
Die Castings ◽  
Pressure Die Casting ◽  
Gate Region

This article focuses on the influence of intensification pressure (I.P.) on the feeding through the gate during high pressure die casting (HPDC). Two values of intensification pressure, the lowest and highest possible for the HPDC machine used, were applied to cast AlSi3MgMn tensile-bar specimens. The castings produced with higher I.P. contained a lower total fraction of porosity, as expected. Microstructural characterisation of the gate region showed markedly different features in and adjacent to the gate at the two levels of I.P. used. The microstructures indicate a change in feeding mechanism with increasing I.P. At high I.P. shear band-like features exist through the gate, suggesting that strain localisation in the gate is involved in the feeding of solidification shrinkage during the I.P. stage. At low I.P. such shear bands were not observed in the gates and feeding was less effective, resulting in a higher level of porosity in the HPDC parts.

Integration of Piezoceramic Modules into Die Castings - Procedure and Functionalities

2008 ◽  
Vol 56 ◽  
pp. 170-175 ◽  
Author(s):  
Matthias Rübner ◽  
Carolin Körner ◽  
Robert F. Singer
Keyword(s):  
High Pressure ◽  
Die Casting ◽  
Structural Elements ◽  
High Pressure Die Casting ◽  
Sensor Actuator ◽  
Complete Integration ◽  
Mould Filling ◽  
Enhanced Properties ◽  
Die Castings ◽  
Pressure Die Casting

The complete integration of piezoceramic sensor/actuator-modules into metal components using high pressure die casting is a promising approach for the fabrication of multifunctional structural elements with enhanced properties. A technique providing stabilization and protection of the module during the highly dynamic mould filling is presented. Demonstration parts are produced which are fully capable to detect vibrations. An approach to characterize this sensory functionality of the adaptronic system is presented.

Application of a Novel Entrainment Defect Model to a High Pressure Die Casting

2014 ◽  
Vol 922 ◽  
pp. 801-806
Author(s):  
Robert Watson ◽  
Tayeb Zeguer ◽  
Simon Ruffle ◽  
William D. Griffiths
Keyword(s):  
High Pressure ◽  
Surface Film ◽  
Die Casting ◽  
Weibull Statistics ◽  
High Pressure Die Casting ◽  
Trapped Air ◽  
Mould Filling ◽  
Computational Fluid Dynamics Cfd ◽  
Die Castings ◽  
Pressure Die Casting

Aluminium High Pressure Die Castings are economical to produce in high volumes. However, as greater structural demands are placed on such castings, a more detailed understanding is required of the defects which limit their strength. The process is prone to high levels of surface turbulence and fluid break-up, resulting in the entrainment of air into the liquid metal, which may manifest as trapped air porosity or bifilm defects in the finished part. A novel algorithm was developed and integrated into a commercial computational fluid dynamics (CFD) package, to model mould filling, and the formation and transport of such entrainment defects. A commercial High Pressure Die Casting was simulated using this algorithm, to illustrate its application. Castings were also produced, and the results of tensile testing were summarised in the form of Weibull statistics. It was found that where the algorithm predicted a greater quantity of entrained surface film, a reduction in UTS of about 10% was also observed.

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