Properties of scattered structures included in aluminum die castings.

Iwahori, Hiroaki; Tozawa, Katsutoshi; Asano, Takashi; Yamamoto, Yoshiaki; Nakamura, Motoyuki; Hashimoto, Masaoki; Uenishi, Shiro

doi:10.2464/jilm.34.525

Cited by 22 publications

(11 citation statements)

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“…The primary alpha dendrites are also observed in the die cast sample. The average cooling rate estimated from 2 is approximately 60 K/s at the depth of 0.5 mm from the surface of die castings. The computational numerical simulation reveals that the values of solidification parameter G= ffiffiffi ffi R p increases around the surface of the JIS-ADC12 die castings in where the amount of shrinkage porosities decreases.…”

mentioning

confidence: 95%

“…The relationship between 2 and ¿ f in present study can be expressed as in eq. (2), as shown in 0.31 of the exponent n is calculated, and is close to the value reported by Mori et al 14) Besides, the relationship between cooling rate (R), which is defined as the temperature difference between liquidus line and multi-component reaction start point divided by local solidification time, and 2 is expressed as eq.…”

Section: )mentioning

confidence: 99%

“…9. In the present study, 2 were measured in the area of multicomponent eutectic growing, because primary dendrite finishes growing and outline of secondary dendrite arm can be clearly observed. Local solidification time is defined as the time interval between initiation of primary dendrite and multi-component eutectic structure.…”

Section: Coarsening Of Dendrite Armmentioning

confidence: 99%

“…Aluminum alloy die casting products occasionally contain undesirable casting defects in the bodies, for example cold flakes (scattered chilled layers), 1,2) surface segregations, 3) shrinkage cavities 4) (open shrinkage, internal shrinkage and shrinkage porosities), and gas porosities. 57) Especially, shrinkage porosities are regarded as a serious defect which cause problems to pressure resistance, strength and dimension accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Solidification Microstructure and Critical Conditions of Shrinkage Porosity Generation in Die Casting Process of JIS-ADC12 (A383) Alloy

Hamasaki

Miyahara

2013

Mater. Trans.

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Differential thermal analysis (DTA), analyses of unidirectional solidification process and die casting process, and computational numerical simulations were conducted for JIS-ADC12 (A383) alloy to investigate the generation conditions of shrinkage porosities which occasionally appear in JIS-ADC12 die castings and affect the quality of products. The crystallization temperature of the primary alpha phase and AlSi binary eutectic phase are estimated to be 856 and 838 K from DTA, respectively. The multi-phase eutectic reaction of JIS-ADC12 alloy starts from 826 K, and finishes at 801 K. The primary alpha dendrites are clearly observed in the unidirectional solidification microstructures, and the relationship between the secondary dendrite arm spacing 2 and the local solidification time ¿ f is expressed by the following equation:

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mentioning

confidence: 95%

Section: )mentioning

confidence: 99%

Section: Coarsening Of Dendrite Armmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solidification Microstructure and Critical Conditions of Shrinkage Porosity Generation in Die Casting Process of JIS-ADC12 (A383) Alloy

Hamasaki

Miyahara

2013

Mater. Trans.

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“…Poor wetting of the oxide layer with the matrix causes crevice at a boundary between the cold flake and the matrix by relatively low forces, and hence the strength of die-cast products is largely reduced. [4][5][6][7][8][9] Therefore it has been very important to detect cold flakes in the die-cast products for assurance of quality. Although pores and cavities also reduce the strength of the die-casts.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Detection of Cold Flakes in Aluminum Alloy Die-Cast Plate with Ultrasonic Measurement

et al. 2004

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Aluminum alloy die-cast plates (ADC 12) were subjected to ultrasonic measurement to obtain a relation between the intensity distribution of the ultrasonic wave and positions of cold flakes appearing in the plate for developing a nondestructive method to detect cold flakes in the diecasts. Die-cast plates of 170 mm in length, 50 mm in width and 6.8 mm in thickness were produced with wider gates to introduce larger cold flakes in the plate. Then the ultrasonic measurement was carried out with the immersion method by using a probe generating a longitudinal wave of 20 MHz in frequency. Intensity distributions of the ultrasonic wave were obtained from the surface to the bottom. The cross section analysis was carried out to examine the distribution of the cold flake. From the cross section analysis, three types of cold flakes were observed: the type A with a straight boundary of initial solidification with oxide thin layer, the type B with a straight boundary without oxide layer, and the type C of an irregular and wavy boundary without oxide layer. In the case of the type C, the oxide layer was thought to be out of the observed section. The ultrasonic wave was slightly reflected from the front and rear boundaries between the cold flake and the matrix, and it was found that the position and the thickness of the cold flake can be detected by ultrasonic measurement.

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Relevance of instrumented nano-indentation for the assessment of the mechanical properties of eutectic crystals and α-Al grain in cast aluminum alloys

2011

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Properties of scattered structures included in aluminum die castings.

Cited by 22 publications

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Solidification Microstructure and Critical Conditions of Shrinkage Porosity Generation in Die Casting Process of JIS-ADC12 (A383) Alloy

Solidification Microstructure and Critical Conditions of Shrinkage Porosity Generation in Die Casting Process of JIS-ADC12 (A383) Alloy

Nondestructive Detection of Cold Flakes in Aluminum Alloy Die-Cast Plate with Ultrasonic Measurement

Relevance of instrumented nano-indentation for the assessment of the mechanical properties of eutectic crystals and α-Al grain in cast aluminum alloys

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