An Analysis of the Ribbon Formation Process by the Single Roller Rapid Solidification Technique

Takeshita, Kunimasa; Shingu, Paul Hideo

doi:10.2320/matertrans1960.24.529

Cited by 42 publications

(16 citation statements)

References 8 publications

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“…[8] and [9] into [7] and integrating, the mass of the melt pool is computed as [10] Finally, Eq. [10] is substituted into Eq.…”

Section: Further Results Analysis and Discussionmentioning

confidence: 99%

“…[8] and [9] into [7] and integrating, the mass of the melt pool is computed as [10] Finally, Eq. [10] is substituted into Eq. [4] to compute the expected frequency for any axisymmetric mode, using the measured values of h m , l m , and W. Without an independently determined surface energy for this particular Fe-Si-B alloy, we employ the value of ϭ 1.2 N/m, measured for the composition Fe 78 Si 9 B 13 .…”

Section: Further Results Analysis and Discussionmentioning

confidence: 99%

“…Various modeling approaches and analytical treatments have made some progress toward the general prediction of thermal conditions within the melt pool. [8][9][10][11][12][13][14][15][16][17] Since MS is often implemented to achieve rates sufficiently high to avoid nucleation altogether, resulting in an amorphous or glassy ribbon, nucleation control is of primary importance. However, nucleation kinetics are generally very sensitive to local temperature, with volumetric nucleation rates generally varying as exp(Ϫ1/T⌬T microstructural control remains problematic.…”

Section: Introductionmentioning

confidence: 99%

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The role of melt pool behavior in free-jet melt spinning

Napolitano

Meco

2004

Metall Mater Trans A

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The influence of melt pool behavior on the competition between the nucleation of crystalline solidification products and glass formation is examined for an Fe-Si-B alloy. High-speed imaging of the melt pool, analysis of ribbon microstructure, and measurement of ribbon geometry and surface character all indicate upper and lower limits for melt spinning (MS) rates for which fully amorphous ribbons can be achieved. Comparison of the relevant time scales reveals that surface-controlled melt pool oscillation may be the dominant factor governing the onset of unsteady thermal conditions accompanied by varying amounts of crystalline nucleation observed near the lower limit. At high rates, the influence of these oscillations is minimal due to very short melt pool residence times. However, microstructural evidence suggests that the entrapment of gas pockets at the wheel-metal interface may play a critical role in establishing the upper rate limit. An observed transition in wheel-side surface character with an increasing MS rate supports this contention. The Role of Melt Pool Behavior in Free-Jet Melt Spinning R.E. NAPOLITANO and H. MECOThe influence of melt pool behavior on the competition between the nucleation of crystalline solidification products and glass formation is examined for an Fe-Si-B alloy. High-speed imaging of the melt pool, analysis of ribbon microstructure, and measurement of ribbon geometry and surface character all indicate upper and lower limits for melt spinning (MS) rates for which fully amorphous ribbons can be achieved. Comparison of the relevant time scales reveals that surface-controlled melt pool oscillation may be the dominant factor governing the onset of unsteady thermal conditions accompanied by varying amounts of crystalline nucleation observed near the lower limit. At high rates, the influence of these oscillations is minimal due to very short melt pool residence times. However, microstructural evidence suggests that the entrapment of gas pockets at the wheel-metal interface may play a critical role in establishing the upper rate limit. An observed transition in wheel-side surface character with an increasing MS rate supports this contention.

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“…[8] and [9] into [7] and integrating, the mass of the melt pool is computed as [10] Finally, Eq. [10] is substituted into Eq.…”

Section: Further Results Analysis and Discussionmentioning

confidence: 99%

Section: Further Results Analysis and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The role of melt pool behavior in free-jet melt spinning

Napolitano

Meco

2004

Metall Mater Trans A

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“…Extrapolating the trends to higher heat transfer coefficients, the conclusion arises that the better the heat contact, the less the thermal effect penetrates into the melt pool and the smaller the final ribbon thickness. This idea contradicts not only the natural first guess, which claim a thicker ribbon for better cooling conditions but also the predictions of the "pure thermal transport treatment" (5).…”

mentioning

confidence: 59%

“…The numerical solution was obtained by the until a variation less than 10-6 was found for 2. Casting conditions and physical properties Since the most extended studies of the boundary layer structure have been published for the glass forming alloy, Fe40Ni40P14B6 (5), in the present work physical properties characteristic of this composition are used (see Table 2). In the computations the casting conditions were fixed as: Uw=20m/s and T0=1268 K, while a melt pool length of L=4.7mm was supposed.…”

Section: Boundary Layer Model With Perfect Heat Contactmentioning

confidence: 99%

Analysis of the Ribbon Formation Process on the Single Roller Rapid Solidification Technique

Gránásy

1986

Trans. JIM

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The effect of cooling conditions on the structure of the momentum boundary layer has been studied under circumstances characteristic of the single roller rapid quenching technique. In spite of some recent results, the present computations, which take the heat and momentum transport and the temperature dependence of viscosity into account, suggest a more effective momentum transport and a thicker ribbon for better cooling conditions, supporting former expectations based on the pure heat transport treatment.However, it is also indicated that the solidification controlled ribbon formation can be excluded.

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Rapid Solidification

Suryanarayana

2006

Materials Science and Technology

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An Analysis of the Ribbon Formation Process by the Single Roller Rapid Solidification Technique

Cited by 42 publications

References 8 publications

The role of melt pool behavior in free-jet melt spinning

The role of melt pool behavior in free-jet melt spinning

Analysis of the Ribbon Formation Process on the Single Roller Rapid Solidification Technique

Rapid Solidification

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