Mechanical Properties of Carbon Steels during Solidification

Shin, Geonyeong; Kajitani, Toshiyuki; Suzuki, Toshio; Umeda, T.

doi:10.2355/tetsutohagane1955.78.4_587

Cited by 48 publications

(36 citation statements)

References 2 publications

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“…8(a) and 8(b) indicate that the carbon steels have strength in the temperature range between ZST and ZDT, because dendrite arms combine each other. 4,5) Ductile intergranular dimple fracture, which was observed at the test temperature of 1 299°C (Fig. 8(c)), indicates the completion of solidification.…”

Section: Resultsmentioning

confidence: 99%

“…1) The mechanical properties of steels in the temperature range of mushy zone can be characterized by the zero strength temperature (ZST) and zero ductility temperature (ZDT), 1) which have been investigated by the high temperature tensile tests subject to the in-situ melting and solidifying thermal history. [2][3][4][5] The ZDT has been reported to be lower than ZST by the experimental measurements. [4][5][6] Shin et al 4) reported that the solid fraction at ZST corresponded to the range of 0.6-0.7, while that at ZDT corresponded to 1.0.…”

Section: Introductionmentioning

confidence: 95%

“…[2][3][4][5] The ZDT has been reported to be lower than ZST by the experimental measurements. [4][5][6] Shin et al 4) reported that the solid fraction at ZST corresponded to the range of 0.6-0.7, while that at ZDT corresponded to 1.0. Nakagawa et al 5) reported that the solid fractions at ZST and ZDT were 0.75 and 0.98, respectively, in high carbon steels.…”

Section: Introductionmentioning

confidence: 95%

“…(8) for samples L, M and H as a function of solid fraction. The solid fraction of the mushy zone as a function of temperature was calculated using the numerical microsegregation analysis proposed by Ueshima et al 25) Tensile strength increases above the critical solid fraction because dendrites begin to have network structures and an increase in contact area of growing dendrite arms, 4,5) as shown schematically in Fig. 9.…”

Section: ϫ3mentioning

confidence: 99%

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Mechanical Behavior of Carbon Steels in the Temperature Range of Mushy Zone.

Seol

Won

et al. 2000

ISIJ International

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 95%

Section: ϫ3mentioning

confidence: 99%

See 2 more Smart Citations

Mechanical Behavior of Carbon Steels in the Temperature Range of Mushy Zone.

Seol

Won

et al. 2000

ISIJ International

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“…7(a) and 7(b), 29) against the average temperature of the shell determined by the solidification temperature and the interfacial temperature of the shell touching the chill block. In the figures, the fracture strength measured with the in-situ melting and solidified tensile test 32) (hereafter in-situ MST test) are compared with those of SSCT test. The fracture strength is approximately 1 to 3.5 MPa for an initial solidifying shell (shell thicknessϭ2 to 5 mm), and increases gradually with decreasing shell temperature.…”

Section: Upper Limit Of Casting Speed Of Continuous Castermentioning

confidence: 99%

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Suzuki

Nakada

2001

ISIJ International

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Two decades ago the casting speed of the conventional slab continuous caster was increased stepwise to a level over 2 m/min. Henceforth, the casting speed has been remained a similar level. In this review the reasons for constraining the casting speed are discussed. As a result the constraints of the high-speed casting are thought mold powder entrapment and longitudinal facial crack occurring in high-speed casting.Some measures to prevent the mold powder entrapment and the longitudinal facial crack are discussed. Resultantly the research issues we should develop are considered such as prevention of alumina built-up in a submerged entry nozzle, control of fluid flow in a mold and control of heat transfer through mold powder film interved between a solidifying shell and a mold wall. They are most important to realize the high-speed continuous casting of conventional slab.KEY WORDS: high-speed casting; conventional slab; mold powder entrapment; longitudinal facial crack; upper limit of casting speed.order to realize the ideal process, i.e., full hot direct rolling, technologies for more stability of the casting practice and the production of higher slab quality should be realized.The casting speed of the conventional slab caster with an oscillating mold has been remained a 2 m/min level because such higher-speed casting deteriorates slab quality. Therefore, we will investigate what the factors for restraining the casting speed of the conventional slab caster are. Present State of High-speed Continuous Casting of Steel Slab Trend of Casting Speed of Conventional SlabContinuous Caster We will survey the present state of high-speed casting in a conventional slab caster. The trend of the casting speed is shown in Fig. 3 10) for the conventional slab casters in Japanese steel companies. The main specifications and the casting speed are listed in Table 1 of the conventional slab casters. [11][12][13][14][15][16][17][18] The casting speed has been stepwise increased and attained approximately twice in two decades. Fifteen years ago a synchronized operation began between a continuous caster and a hot strip mill, i.e., hot direct rolling. 19) Since the hot direct rolling operation needs the productivity of the caster to be met to that of the hot strip mill, the casting speed should be increased. Heat Transfer and Lubrication Phenomena inContinuous Casting Mold at High-speed Casting The infiltration of liquid powder into a shell/mold gap is a very important process in continuous casting since it is necessary to ensure both good lubrication and uniform heat transfer between a shell and a mold. Failure to provide these conditions could result in the creation of surface defects and sticker breakouts.We will survey the heat transfer and the lubrication phenomena in a mold at a casting speed over 2 m/min of slab casters.Local heat flux in casting of low carbon Al killed steel is shown in Fig. 4 20) against the remaining time in a mold. The local heat flux during the conventional slab casting given by Suzuki et al.,21) and Grilles...

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