Influence of Overheating Temperature on the Shape of Primary Silicon Crystals in Hypereutectic Al-Si Cast Alloys

Piątkowski, J.

doi:10.4028/www.scientific.net/ssp.203-204.417

Cited by 10 publications

(10 citation statements)

References 17 publications

(11 reference statements)

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“…This demonstrates the possibility of the replacement of the solid state heat treatment by the thermal treatment of the alloy in the liquid state. As noted in [16], overheating of the liquid metal indicates a slight increase in primary energy consumption required to withstand the alloy at high temperature (over T liq ) and the consumption of refractory materials. However, in the general economic account, the consumption of energy and materials in the proposed technological solution (significant overheating and modification) may be more beneficial than the traditional way of melting, casting and separate solution heat treatment and aging of the cast in solid state.…”

Section: Discussionmentioning

confidence: 87%

“…Fine crystalline structure can also be obtained by the so-called thermal treatment of the alloy in the liquid state. It involves overheating of the liquid metal to about 250 ÷ 300oC above the liquidus temperature, holding for some time and quick cooling to pouring temperature just before pouring into the mold [11][12][13][14][15]. This technology results in dissolution of accidental inclusions which can become uncontrolled heterogeneous nucleation sites and also deliberate introduction of other icoculats.…”

Section: Introductionmentioning

confidence: 99%

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The Microstructure And Mechanical Properties Of The AlSi17Cu5 Alloy After Heat Treatment

Piątkowski¹,

Matuła²

2015

Archives of Metallurgy and Materials

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In the paper results of the microstructure and mechanical properties (HB, Rm and R0,2) of AlSi17Cu5 alloy, subjected by solution heat treatment (500ºC/6h/woda) and aging (200ºC/16h/piec) are presented. In next step the alloy was modified and heated significantly above the Tliq temperature (separately and together). It was found that the increase in the strength properties of the tested alloy after heat treatment compared to alloys without solution heat treatment and aging was due to precipitation hardening. The applied aging treatment of ingots (preceded by solution heat treatment), causes not only increase in concentration in α(Al) solid solution, but also a favorable change of the primary Si crystals morphology. During stereological measurements significant size reduction and change in the morphology of hypereutectic silicon crystals ware found. This effects can be further enhanced by overheating the alloy to a temperature of 920ºC and rapid cooling before casting of the alloy.

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Section: Discussionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

The Microstructure And Mechanical Properties Of The AlSi17Cu5 Alloy After Heat Treatment

Piątkowski¹,

Matuła²

2015

Archives of Metallurgy and Materials

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“…An intensification of the heat transfer from the casting can be also achieved using a suitable cooling medium to the metal mould [4]. Apart from the intensifying of the cooling rate the microstructure and properties of silumins can also be improved through their refining, modification, heat treatment, adding of alloying elements or the crystallization in a magnetic field [5][6][7][8][9]. Among the alloying elements, the elements with a high melting point such as chromium, molybdenum, vanadium and tungsten can be distinguished.…”

Section: Introductionmentioning

confidence: 99%

Hypoeutectic Silumin to Pressure Die Casting with Vanadium and Tungsten

Szymczak

Gumienny

Pacyniak

2016

Archives of Metallurgy and Materials

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The 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.

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“…The intensification of the cooling process can also be achieved using an appropriate cooling medium of metal mould [2]. The microstructure as well as mechanical properties of Al-Si alloys can also be improved through their refining, modification, heat treatment, using an alloying elements or the crystallization in a magnetic field [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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

Szymczak¹,

Gumienny²,

Pacyniak³

2016

Archives of Foundry Engineering

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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.

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Influence of Overheating Temperature on the Shape of Primary Silicon Crystals in Hypereutectic Al-Si Cast Alloys

Cited by 10 publications

References 17 publications

The Microstructure And Mechanical Properties Of The AlSi17Cu5 Alloy After Heat Treatment

The Microstructure And Mechanical Properties Of The AlSi17Cu5 Alloy After Heat Treatment

Hypoeutectic Silumin to Pressure Die Casting with Vanadium and Tungsten

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

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