Investigation of Secondary Dendrite Arm Coarsening of Al-Cu-Si Alloy

Rontó, Viktória; Roósz, András

doi:10.4028/www.scientific.net/msf.329-330.79

Cited by 5 publications

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“…The solidification is characterised by the local solidification time (t 0 ) as it has a direct relationship with the SDAS (λ 2 ). The relationship between 2 λ and t 0 [7]:…”

Section: Calculation Of the Local Solidification Timementioning

confidence: 99%

Unidirectional Solidification of Pb-Sn Alloys in a Rotating Magnetic Field

Kovács

Rónaföldi

Roósz

2014

MSF

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Cylindrical Pb-Sn alloy samples (diameter: 8 mm, length: 120 mm) of different compositions (30, 40 and 50 wt.% of Sn) were prepared from high pure (4N) components. The unidirectional solidification experiments have been performed according to the upward vertical Bridgman-method by using a rotating magnetic field (RMF) with a magnetic induction of 150 mT and with a frequency of 50 Hz. The sample-movement velocity was constant (0.05 mm/s) and the temperature gradient changed from 7 to 3 K/mm during the solidification process. The first half of samples was solidified without using the magnetic field and the second half was solidified by using the magnetic field. Under the influence of this strong flow induced by the magnetic field, the columnar microstructure of the first part decomposed and a characteristic "Christmas tree"- like macrosegregated structure with equiaxed Pb-dendrites was developed. The secondary dendrite arm spacing (SDAS) and the volume percent of primary Pb-phase (dendrite) were measured by an automatic image analyser on the longitudinal polished sections along the whole length of the samples. The effect of the forced melt flow on the micro-and macrostructure was studied in case of the different sample compositions.

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“…The solidification is characterised by the local solidification time (t 0 ) as it has a direct relationship with the SDAS (λ 2 ). The relationship between 2 λ and t 0 [7]:…”

Section: Calculation Of the Local Solidification Timementioning

confidence: 99%

Unidirectional Solidification of Pb-Sn Alloys in a Rotating Magnetic Field

Kovács

Rónaföldi

Roósz

2014

MSF

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“…The experiments were made at three different cooling rates (0.29 K/s, 0.16 K/s and 0.08 K/s) then the secondary dendrite arm spacing was measured on the specimens having equiaxial structure. The detailed description of solidification experiments can be found in [4].…”

Section: Solidification Experimentsmentioning

confidence: 99%

Numerical Simulation of Dendrite Arm Coarsening in the Case of Ternary Al Alloys

Rontó

Roósz

2003

MSF

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The secondary dendrite arm spacing at a given cooling rate has been calculated during the solidification by usig the numerical method. The Feuer-Wunderlin coarsening parameter valid for the binary alloys has been applied for the ternary AlCuSi system on the basis of the Tensi-Fuchs, Beaverstock and Roósz methods. The solidification time has been substituted from the real cooling curves then the calculated secondary dendrite arm spacing has been compared with the experimental data. It has been stated by the further investigations that the numerical method can be substituted by a much simpler function by which the secondary dendrite arm spacing developing at the end of solidification can exactly be determined.

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“…The secondary dendrite arm spacing (SDAS) is a characteristic of dendritic microstructures [16,17]. The SDAS follows a linear relation with the cube root of total solidification time, t 1/3 [6,18,19]. However, it has been observed that after long coarsening times the microstructure shows a globular appearance [20] which complicates an accurate measurement of the SDAS.…”

Section: Introductionmentioning

confidence: 99%

Evolution of primary austenite during coarsening and impact on eutectic microstructure in Fe–C–Si alloys

et al. 2019

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The evolution of primary austenite morphology during isothermal coarsening has been studied in the three main Fe-C-Si alloys used in industry, LGI, CGI, and SGI. The dendritic microstructure increases length scale during coarsening accompanied by fragmentation and coalescence of austenite crystals. The morphological parameters, SDAS, M γ , D ID hyd , and D γ show a linear relation with the cube root of coarsening time, t 1/3 , with similar rates for the three different Fe-C-Si alloys. The eutectic microstructures after coarsening of primary austenite in CGI and SGI alloys are not significantly affected by the surface area of primary austenite and the size of the interdendritic regions. Fraction, nodularity, shape distribution of graphite particles and the number of nodules and eutectic cells are similar when studied as a function of coarsening time. These results suggest that the nucleation frequency in CGI and SGI, and the growth of eutectic microstructures in CGI, are not significantly influenced by the morphology of primary austenite.

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Investigation of Secondary Dendrite Arm Coarsening of Al-Cu-Si Alloy

Cited by 5 publications

References 0 publications

Unidirectional Solidification of Pb-Sn Alloys in a Rotating Magnetic Field

Unidirectional Solidification of Pb-Sn Alloys in a Rotating Magnetic Field

Numerical Simulation of Dendrite Arm Coarsening in the Case of Ternary Al Alloys

Evolution of primary austenite during coarsening and impact on eutectic microstructure in Fe–C–Si alloys

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