Evaluation of the gas porosity and mechanical properties of vacuum assisted pore-free die-cast Al-Si-Cu alloy

Kang, Ho Jung; Yoon, Pil Hwan; Lee, Gyu Heun; Park, Jin Young; Jung, Bernhard; Lee, Ji Yong; Lee, Cheol Ung; Kim, Eok Soo; Choi, Yoon Suk

doi:10.1016/j.vacuum.2020.109917

Cited by 21 publications

(20 citation statements)

References 35 publications

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“…The results confirmed that compared to CDC, all three methods reduce the gas porosity. In particular, it was confirmed that the gas porosity was significantly reduced by VPFDC, in which the vacuum and oxygen injection systems were combined [7].…”

Section: Introductionmentioning

confidence: 85%

“…A die-casting process comprising a vacuum system is one way to reduce gas porosity in castings. Conventional vacuum die casting incorporates a vacuum of <200 mbar to realize inner gas quantities in the castings ranging between 10 and 15 cc/100 g [6,7]. However, it still has many gas porosities to apply to heat treatment and welding.…”

Section: Introductionmentioning

confidence: 99%

“…In high-vacuum die casting, the vacuum is <50 mbar, and the inner gas quantities of the castings can be reduced to values ≤3 cc/100 g, so that the casting is heat treatable and weldable. However, this process has the disadvantage of high facility investment cost [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…When active oxygen is injected, the nitrogen, which makes up most of the air in the sleeve, is replaced with active oxygen (Figure 1b). Thus, when the molten aluminum is poured into the mold, the active oxygen oxidizes the molten aluminum (Equation ( 1)) [7,8,10].…”

Section: Introductionmentioning

confidence: 99%

“…Notably, PF die casting affords castings of low gas porosity, similar to those attained by high-vacuum die casting. In addition, it has the advantage of cheaper facility costs than those required for high-vacuum die casting [7,10].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Injected Oxygen Amount on the Gas Porosity and Mechanical Properties of a Pore-Free Die-Cast Al–Si–Cu Alloy

Kang

Jang

et al. 2021

Metals

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With the rise in the demand for eco-friendly and electric vehicles, welding and heat treatment are becoming very important to meet the necessary weight reduction, complexity, and high functionality of die castings. Pore-free (PF) die casting is an effective process that enables heat treatment and welding due to low gas porosities. Indeed, this process affords castings of low gas porosity, similar to those attained by high-vacuum die casting. In this study, we compared the gas porosities of different castings fabricated by PF die casting using varied injected oxygen amounts. The castings were all subjected to T6 heat treatment and analyzed by computed tomography (CT) to compare their microstructure and mechanical properties before and after T6 heat treatment. The results revealed that with the increasing injected oxygen amount, the gas porosity of the specimens decreased while their mechanical properties increased. In particular, the gas porosity was the lowest at 1.26 L. Moreover, the 1.26 L specimen displayed the best tensile strength, yield strength, and elongation results. Finally, Weibull distribution analysis revealed that the tensile strength and elongation repeatability and reproducibility increased with increasing injected oxygen amount.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%