Computer Modeling of Primary Structure Formation in Ductile Iron

Fraś, E.; Kapturkiewicz, W.; Burbielko, A.A.

doi:10.4028/www.scientific.net/amr.4-5.499

Cited by 16 publications

(22 citation statements)

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“…The literature presents a variety of methods for determining the fraction solid of casting alloys [12,[21][22][23][24]. The most commonly used technique employs quantitative metallography using image analysis.…”

Section: Latent Heat and Fraction Solid Determinationmentioning

confidence: 99%

Assessment of the effect of grain refinement on the solidification characteristics of 319 aluminum alloy using thermal analysis

Shabestari

Malekan

2010

Journal of Alloys and Compounds

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Section: Latent Heat and Fraction Solid Determinationmentioning

confidence: 99%

Assessment of the effect of grain refinement on the solidification characteristics of 319 aluminum alloy using thermal analysis

Shabestari

Malekan

2010

Journal of Alloys and Compounds

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“…There are mainly two methods for determining the baseline: Newtonian analysis [27][28][29] and Fourier analysis. [26,31] The Fourier method, which should measure the positions of two thermocouples at the beginning and end of the solidification, is much more complicated than the Newtonian method. Moreover, as thermal contraction of the alloys occurs during the solidification, the exact positions of the two thermocouple tips are difficult to measure.…”

Section: B Solid Fraction Curvesmentioning

confidence: 99%

Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys

Han

et al. 2009

Metall Mater Trans A

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This work mainly investigated the microstructure and mechanical properties of Mg-Zn-Y-Zr alloys with Zn/Y ratios of 5 and 10. An X-ray diffraction (XRD) analysis indicated that the two alloys were mainly composed of an icosahedral phase (I-phase) and a-Mg matrix. For the alloy with a Zn/Y ratio of 10, however, the diffraction peaks of the I-phase were stronger. Microstructure observation showed that the I-phase preferentially existed in the form of I-phase/a-Mg matrix interdendritic eutectic pockets at grain boundaries. Moreover, when the Zn/Y ratio was increased 2 times, the volume fraction of the I-phase in the a-Mg matrix increased 1.5 times and a tiny Mg 7 Zn 3 phase formed. Energy-dispersive spectroscopy (EDS) mapping and electron probe microanalysis (EPMA) results suggested that the chemical composition of the I-phase was not a constant value. Computer-aided cooling curve analysis (CA-CCA) indicated that, for the alloy with a Zn/Y ratio of 5, formation of the I-phase relied on the W-phase transformation and the eutectic reaction of the residual melt. However, the I-phase formation for the alloy with a Zn/Y ratio of 10 depended on the eutectic reaction of the melt. Tensile tests indicated that the mechanical properties of the two as-cast alloys were poor. After hot extrusion processing, the mechanical properties of the alloy with a Zn/Y ratio of 10 were noticeably increased. The ultimate tensile strength (UTS) and elongation to failure reached 320 MPa and 13 pct, respectively.

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“…Following this, the time between iterations, One of the difficulties in modeling heat transfer during which is dependent on the thermophysical properties of the solidification is that of coupling microstructural and thermal steel and on the number of elements into which the plate phenomena, since it is expected that the heat-transfer coeffiwas divided, is given by [24] cient will be higher during the early stages of solidification than later on, mainly due to the air gap formed by metal ␦t Յ d 2 (m Ϫ 0.75) s 2mk [6] shrinkage. [13][14][15][16][17][18] Solidification of the aluminum alloy in contact with the steel plate was followed by thermal analysis; the 0.75 value comes from the assumption that the tempera- Figures 6 and 7 show the method used to obtain the critical ture distribution toward the surface follows a parabolic distripoints of transformation [19,20,21] in test II. The points marked bution with respect to distance.…”

Section: Mathematical Modeling As a Productive Tool Ismentioning

confidence: 99%

Casting-chill interface heat transfer during solidification of an aluminum alloy

Velasco¹,

Valtierra²,

Mojica³

et al. 1999

Metall Mater Trans B

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Unidirectional solidification tests on an aluminum alloy were conducted with a computer-controlled instrumented rig. The alloys employed in this study were poured into isolated ingot molds (made of recrystallized alumina and covered with ceramic fiber) placed on top of a steel plate, coated either with a graphite-or ceramic-based paint in order to avoid sticking of the material. Thermal evolution during the test was captured by type-K thermocouples placed at different positions in both the ingot and the plate. The bottom surface of the plate was either cooled with water or left to cool in air. The heat-transfer coefficients across the aluminum-steel interface were evaluated by means of a finitedifference model. It was concluded that the heat-transfer rate depends on the conditions at the interface, such as the type of coating used to protect the plate, and the solidification reactions occurring on the aluminum during its solidification.

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Computer Modeling of Primary Structure Formation in Ductile Iron

Cited by 16 publications

References 0 publications

Assessment of the effect of grain refinement on the solidification characteristics of 319 aluminum alloy using thermal analysis

Assessment of the effect of grain refinement on the solidification characteristics of 319 aluminum alloy using thermal analysis

Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys

Casting-chill interface heat transfer during solidification of an aluminum alloy

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