Solidification Analysis of Steel Ingots with Consideration on Fluid Flow

Ohnaka, Itsuo; Fukusako, Tatsuichi

doi:10.2355/isijinternational1966.21.485

Cited by 24 publications

(9 citation statements)

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“…[1,7] The differences in size and morphology of the primarily solidified dendrites along the radial direction of the cast cylinder is due to the radial distribution of the cooling rate. [12][13][14][15] It has a maximum at the cylinder surface in contact with the copper mold and a minimum in the center of the cylinder. [12] The radial distribution of the cooling rate also leads to a sequential solidification process from the cylinder surface toward the center and results in a small shrinkage hole in the core, as shown in Figure 1(a).…”

Section: Methodsmentioning

confidence: 99%

Effect of Sn on microstructure and mechanical properties of Ti-base dendrite/ultrafine-structured multicomponent alloys

Hagiwara

Eckert

2004

Metall Mater Trans A

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Ti 57Ϫx Cu 15 Ni 14 Sn 4ϩx Nb 10 (x ϭ 0, 5, or 10) alloys were prepared by copper mold casting. At Sn ϭ 4 at. pct, a dendrite/ultrafine-structured multicomponent alloy was obtained, which exhibits 1271 MPa yield strength, 77 GPa Young's modulus, and 2 pct plasticity at room temperature for 3-mm-diameter samples. The cooling rate significantly affects the as-cast microstructure and the mechanical properties. For 5-mm-diameter samples, the alloy exhibits 1226 MPa yield strength, 63 GPa Young's modulus, and 2.5 pct plasticity. At Sn ϭ 9 at. pct, Ti-, Sn-, and Nb-rich particles precipitate primarily. This near-hypereutectic alloy composition leads to the precipitation of intermetallics, which deteriorate the mechanical properties and result in the coexistence of ductile and brittle fracture mechanisms. At Sn ϭ 14 at. pct, the alloy composition is completely in the intermetallic region, thus inducing the formation of Ti 2 Cu, Ti 2 Ni, and Ti 3 Sn intermetallics. The alloy becomes very brittle because the intermetallic compounds dominate the fracture process.

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Section: Methodsmentioning

confidence: 99%

Effect of Sn on microstructure and mechanical properties of Ti-base dendrite/ultrafine-structured multicomponent alloys

Hagiwara

Eckert

2004

Metall Mater Trans A

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“…(6) with the temperature recovery method [8]. The terminal time of the 2nd stage tter is defined as the time required for the constitutional undercooling to dissipate in the gap between crystals for the entire undercooled region (0 ≤ z ≤ z'), as determined by the following convergence condition:…”

Section: Equations and Calculation Methodsmentioning

confidence: 99%

Heat transfer and solidification processes of alloy melt with undercooling: II. Solidification model

Yoshioka¹,

Tada

Kunimine

et al. 2006

Acta Materialia

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“…The grain size in this layer is estimated from the broad XRD peaks revealing a nanoscale structure. The distribution of the cooling rate in the radial scale of the cylinders can be illustrated in Figure 11 according to the calculation by the finite difference method [22] and the in-situ evaluation. [18] The grain size becomes coarser with increasing distance from the quenched layer and the liquid undergoes primary dendritic solidification toward the center of the cylinder.…”

Section: A As-cast Microstructurementioning

confidence: 99%

Microstructure, mechanical properties, and fracture mechanism of As-cast (Ti0.5Cu0.25Ni0.15Sn0.05Zr0.05)100−x Mo x composites

Löser

Schultz

et al. 2004

Metall Mater Trans A

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Copper mold cast cylinders of (Ti 0.5 Cu 0.25 Ni 0.15 Sn 0.05 Zr 0.05 ) 100-x Mo x composites are prepared. Addition of Mo in the bulk glass-forming alloy induces the formation of a dendrite/matrix composite. For 3-mm-diameter cylinders, the matrix exhibits a homogenous ultrafine microstructure for Mo content of 2.5 at. pct, and a fine eutectic microstructure for 5 at. pct Mo. For 5-mm-diameter cylinders, the matrix exhibits a dendritic microstructure for 2.5 at. pct Mo, and exhibits a coarser eutectic microstructure for 5 at. pct Mo. Despite the formation of a dendrite/nanostructured matrix composite in the cylinders, the quenched surface layer with a nanoscale grain size dominates the deformation and fracture of the 3-mm-diameter cylinders. More than 56 vol pct quenched layer leads to a distensile fracture mode and the samples exhibit high fracture strength and high Young's modulus but low ductility. For 5-mm-diameter cylinders, the composite microstructure becomes dominant due to its more than 64 vol pct volume fraction leading to a cone-shaped fracture surface. The samples exhibit lower yield strength and lower Young's modulus but better ductility compared to the 3-mm-diameter cylinders. The mechanical behavior of the Mo-bearing composites strongly depends on the microstructural homogeneity and casting defects formed upon solidification.

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Solidification Analysis of Steel Ingots with Consideration on Fluid Flow

Cited by 24 publications

References 0 publications

Effect of Sn on microstructure and mechanical properties of Ti-base dendrite/ultrafine-structured multicomponent alloys

Effect of Sn on microstructure and mechanical properties of Ti-base dendrite/ultrafine-structured multicomponent alloys

Heat transfer and solidification processes of alloy melt with undercooling: II. Solidification model

Microstructure, mechanical properties, and fracture mechanism of As-cast (Ti0.5Cu0.25Ni0.15Sn0.05Zr0.05)100−x Mo x composites

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