Effect of pressure on heat transfer coefficient at the metal/mold interface of A356 aluminum alloy

Ilkhchy, Ali Fardi; Jabbari, Masoud; Davami, P.

doi:10.1016/j.icheatmasstransfer.2012.04.001

Cited by 72 publications

(65 citation statements)

References 17 publications

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“…18,19,25) Increasing solidification pressure reduces the size of the air-gap and accelerates the formation of the perfect contact, 16) which promotes the rate of mould temperature increase (1st and 3rd) and ingot temperature (2nd and 4th) decrease, as displayed in Fig. 3.…”

Section: )mentioning

confidence: 97%

“…4) Until now, several kinds of pressurized metallurgy technologies have been developed to manufacture HNSs, including pressurized induction melting (PIM) and pressurized electroslag remelting (PESR) et al [11][12][13][14][15] Meanwhile, the pressure exhibits a significant impact on casting solidification and structure formation. [15][16][17] The effect of the pressurization includes (a) increasing the solidification nucleation rate, (b) reducing the critical nucleus radius, (c) accelerating the cooling rate, 18,19) (d) refining macro/micro-structure, 16,20) and (e) eliminating solidification defects (shrinkage, porosity and pore, et al). 16,17,19,[21][22][23] Although some researchers have studied the influence of pressure on the solidification structure, they mainly focus on the nonferrous metal, 19,24,25) only a few work has been carried out on HNSs.…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17] The effect of the pressurization includes (a) increasing the solidification nucleation rate, (b) reducing the critical nucleus radius, (c) accelerating the cooling rate, 18,19) (d) refining macro/micro-structure, 16,20) and (e) eliminating solidification defects (shrinkage, porosity and pore, et al). 16,17,19,[21][22][23] Although some researchers have studied the influence of pressure on the solidification structure, they mainly focus on the nonferrous metal, 19,24,25) only a few work has been carried out on HNSs. 16,19,20) Gavrilova et al 20) has proposed that a small increment of pressure (several MPa) can significantly increase heat transfer coefficient and refine the casting structure of HNSs.…”

Section: Introductionmentioning

confidence: 99%

“…16,17,19,[21][22][23] Although some researchers have studied the influence of pressure on the solidification structure, they mainly focus on the nonferrous metal, 19,24,25) only a few work has been carried out on HNSs. 16,19,20) Gavrilova et al 20) has proposed that a small increment of pressure (several MPa) can significantly increase heat transfer coefficient and refine the casting structure of HNSs. Zhu et al, 26) using CAFE method to investigate the effect pressure on compactness degree of high nitrogen steel, has concluded that higher solidification pressure is favourable to increase the number of grains of the whole ingot and reduces the primary dendrite arm spacing of central equiaxed.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Solidification Pressure on Interfacial Heat Transfer and Solidification Structure of 19Cr14Mn0.9N High Nitrogen Steel

Zhu

Wang

et al. 2018

ISIJ Int.

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The effect of solidification pressure (0.5, 0.85 and 1.2 MPa) on heat transfer between ingot and mould was investigated with the measurement of cooling curves and calculation of heat transfer coefficient. Combined with cooling rate, temperature gradient and local solidification time (LST), the influence of pressure on solidification structure of 19Cr14Mn0.9N was revealed by macrostructure observation. The calculation results of heat transfer coefficient, obtained by the Beck-Nonlinear estimation technique, indicate that increasing solidification pressure obviously enhances heat transfer at the ingot/mould interface. And higher solidification pressure is benefit to increase cooling rate and temperature gradient of ingot. Meanwhile, increasing solidification pressure considerably suppresses nitrogen gas pore, and reduces the whole area of dispersing porosity and shrinkage, which is favorable to obtain a sound ingot. With the solidification pressure increasing from 0.5 to 1.2 MPa, the columnar zone is lengthened, the columnar-toequiaxed transition (CET) position gradually moves to the ingot center, and both dendritic arm spacing (λ 1 and λ 2 ) and local solidification time (LST) gradually decrease. The solidification structure is significantly refined and compressed under higher solidification pressure.

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Section: )mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Solidification Pressure on Interfacial Heat Transfer and Solidification Structure of 19Cr14Mn0.9N High Nitrogen Steel

Zhu

Wang

et al. 2018

ISIJ Int.

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“…The investigations were carried out in castings with simple geometries by using either gap measurement method or heat conduction methods on heat transfer coefficients (HTC). However, it was observed that interfacial [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], processing methods [16][17][18][19], casting geometry and size [20,21], physical and chemical conditions [22], mold and casting material properties [23], process variables [24][25][26][27][28] and so on directly affect the HTC. The combined effect of these factors influences the HTC, thereby making it difficult to separate and study the main effects of the factors.…”

Section: Introductionmentioning

confidence: 99%

Modelling in Squeeze Casting Process-Present State and Future Perspectives

Patel¹,

MB²

2015

Adv Automob Eng

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The growing demand in today's competitive manufacturing environment has encouraged the researchers to develop and apply modelling tools. The development and application of modelling tools help the casting industries to considerably increase productivity and casting quality. Till date there is no universal standard available to model and optimize any of the manufacturing processes. However the present work discusses the advantages and limitations of some conventional and non-conventional modelling tools applied for various casting processes. In addition the research effort made by various authors till date in modelling and optimization of the squeeze casting process has been reported. Furthermore the necessary steps for prediction and optimization are high lightened by identifying the trends in the literature. Ultimately this research paper explores the scope for future research in online control of the process by automatically adjusting the squeeze cast process parameters through reverse prediction by utilizing the soft computing tools namely, Neural Network, Genetic Algorithms, Fuzzy-logic Controllers and their different combinations. The present work also proposed a detailed methodology, starting from the selection of process variables till the best process variable combinations for extreme values of the outputs responsible for better product quality using experimental, prediction and optimization methodology. Citation: Manjunath Patel GC, Krishna P, Parappagoudar MB (2015) Modelling in Squeeze Casting Process-Present State and Future Perspectives. Modelling in Squeeze Casting

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Development of an A356 die casting setup for determining the heat transfer coefficient depending on cooling conditions, gap size, and contact pressure

Wolff

Vossel

Bührig–Polaczek

et al. 2017

Materialwissenschaft Werkst

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In this paper, the development of an experimental die casting setup to perform simultaneous in-situ measurements of temperatures, air-gap formation and contact pressures is presented. The derivation of the resulting heat transfer coefficients between mold and melt is also included. To take the influence of different cooling rates into account, an active die tempering is applied. For the implementation of this experimental setup, a special mold for a rotationally symmetrical test specimen is developed which incorporates the necessary measuring technique and can be adapted to different cooling conditions by means of exchangeable die inserts. Concluding, first results and the corresponding heat transfer coefficients are presented.Keywords: Heat transfer coefficient / air-gap formation / contact pressure / mold tempering / permanent mold casting Es wird die Entwicklung eines Kokillenguss-Versuchssaufbaus vorgestellt, um gleichzeitige in-situ Messungen von Temperaturen, Spaltbildung und Kontaktdrücken zu ermö glichen, genauso wie die Ermittlung der sich daraus ableitenden Wä rmeü bergangskoeffizienten zwischen Form und Gussteil. Dabei wird der Einfluss von verschiedenen Abkü hlraten durch aktive Formtemperierung berü cksichtigt. Hierfü r wird eine spezielle Form fü r ein rotationssymmetrisches Gussteil entwickelt, die die nö tige Messtechnik aufnehmen sowie durch wechselbare Formeinsä tze an verschiedene Abkü hlbedingungen angepasst werden kann. Es werden erste Ergebnisse inklusive der zugehö rigen Wä rmeü bergangskoeffizienten vorgestellt.Schlü sselwö rter: Wä rmeü bergangskoeffizient / Spaltbildung / Kontaktdruck / Formtemperierung / Dauerformguss Figure 6. Values of the air-gap related heat transfer coefficient for different die temperatures versus the corresponding cast interface temperature. On the right side for the complete solidification process and on the left side a cut out with a smaller temperature range. N. Wolff et al.

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Effect of pressure on heat transfer coefficient at the metal/mold interface of A356 aluminum alloy

Cited by 72 publications

References 17 publications

Effect of Solidification Pressure on Interfacial Heat Transfer and Solidification Structure of 19Cr14Mn0.9N High Nitrogen Steel

Effect of Solidification Pressure on Interfacial Heat Transfer and Solidification Structure of 19Cr14Mn0.9N High Nitrogen Steel

Modelling in Squeeze Casting Process-Present State and Future Perspectives

Development of an A356 die casting setup for determining the heat transfer coefficient depending on cooling conditions, gap size, and contact pressure

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