The development of macrostructure in ingots of increasing size

Morando, R.; Biloni, H.; Cole, Gerald S.; Bulling, G. F.

doi:10.1007/bf02900262

Cited by 50 publications

(20 citation statements)

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“…Earlier investigations [57][58][59][60] have explained the relationship between superheat and the columnar/equiaxed transition. At high superheats, the grains that initially form during pouring due to contact with cold surfaces (and which might serve as nuclei for equiaxed grains in the liquid metal) remelt, allowing the columnar grains to grow uninhibited from the mold/molten metal interface, thereby taking up all the space.…”

Section: A Solidification Reactions and Macrostructurementioning

confidence: 99%

Solidification structure and abrasion resistance of high chromium white irons

Doğan

Hawk

Laird

1997

Metall Mater Trans A

262

124

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Superior abrasive wear resistance, combined with relatively low production costs, makes high Cr white cast irons (WCIs) particularly attractive for applications in the grinding, milling, and pumping apparatus used to process hard materials. Hypoeutectic, eutectic, and hypereutectic cast iron compositions, containing either 15 or 26 wt pct chromium, were studied with respect to the macrostructural transitions of the castings, solidification paths, and resulting microstructures when poured with varying superheats. Completely equiaxed macrostructures were produced in thick section castings with slightly hypereutectic compositions. High-stress abrasive wear tests were then performed on the various alloys to examine the influence of both macrostructure and microstructure on wear resistance. Results indicated that the alloys with a primarily austenitic matrix had a higher abrasion resistance than similar alloys with a pearlitic/bainitic matrix. Improvement in abrasion resistance was partially attributed to the ability of the austenite to transform to martensite at the wear surface during the abrasion process.

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Section: A Solidification Reactions and Macrostructurementioning

confidence: 99%

Solidification structure and abrasion resistance of high chromium white irons

Doğan

Hawk

Laird

1997

Metall Mater Trans A

262

124

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“…Morando et al [5] examined the solidification of Al-2 wt%Cu cylindrical ingots by varying the volume from 5 Â 10 4 to 5 Â 10 6 mm 3 poured into graphite molds with a fixed ratio of internal diameter to internal height of 0.7. They obtained evidence that, with an increase in size, Southin's mechanism of equiaxed grain formation comes into play and that as solidification time increases crystal settling becomes more important [3].…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of the columnar-to-equiaxed grain transition in aluminum–copper hypoeutectic and eutectic alloys

Ares

Gueijman

Schvezov

2010

Journal of Crystal Growth

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“…According to the literature this type of casting defect is proposed to be formed in connection to the dendrite coherency. However a lot research work have been done on columnar to equiaxed transition, [1][2][3][4][5][6][7][8][9][10][11][12] the exact mechanism of shrinkage porosity formation is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Columnar to Equiaxed Transition in Hypoeutectic Lamellar Cast Iron

Svidró

Diószegi

2014

ISIJ Int.

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Shrinkage porosity as a volume change related casting defect in lamellar cast iron was reported in the literature to form during solidification in connection to the dendrite coherency. The present work includes an experimental study on dendrite coherency -also called columnar-to-equiaxed transition in lamellar cast iron using thermal analysis and expansion force measurements. Investigation was carried out in order to study the mechanism of dendrite coherency formation. Cylindrical test bars were cast from the same alloy with different pouring temperature, amount of inoculant and time between the addition of inoculant and start of pouring the samples. Cooling rate and expansion force was recorded as a function of time. A numerical algorithm based on temperature differences measured under solidification was used to interpret the solidification process. Three different methods have been compared to determine the columnar to equiaxed transition. The compared methods were based on registered temperature differences, based on registered expansion forces during the volume change of the solidifying samples and based on the calculated released latent heat of crystallization. The obtained results indicate a considerable influence on the formation and progress of coherency due to variation of casting parameters. It has been shown that the coherency is not a single event at a defined time moment rather a process progressing during a time interval.

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The development of macrostructure in ingots of increasing size

Cited by 50 publications

References 1 publication

Solidification structure and abrasion resistance of high chromium white irons

Solidification structure and abrasion resistance of high chromium white irons

An experimental investigation of the columnar-to-equiaxed grain transition in aluminum–copper hypoeutectic and eutectic alloys

Determination of the Columnar to Equiaxed Transition in Hypoeutectic Lamellar Cast Iron

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