Effects of shot speed and biscuit thickness on externaly solidified crystals of high-pressure diet cast AM60B magnesium alloy

Wang, Baishu; Xiong, Shengwu

doi:10.1016/s1003-6326(11)60778-4

Cited by 32 publications

(13 citation statements)

References 6 publications

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“…5c). Similar structures have been observed by B.S.Wang [17] in die cast AM60B alloy as the fast shot velocity is low and the biscuit is too thin to effectively feed the castings.…”

Section: Effect Of Fast Shot Velocitysupporting

confidence: 79%

Injection Parameters Optimization and Artificial Aging of Automotive Die Cast Aluminum Alloy

Hu¹

2015

Materials and Manufacturing Processes

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High pressure die castings are urgently expected to be used as high-duty structural components in automotive industry. Thus, effects of die casting parameters and aging on the tensile properties of high performance die-cast aluminum alloy are investigated in this work. Results indicate that the HPDC AlMg5Si2Mn specimens, which are formed under the injection pressure of 100MPa, high level fast shot velocity and the speed transition point location of 220mm, possess good internal quality and superb tensile properties (351.1MPa, 200.7MPa, 13.77%). Density of samples decreases along the die filling direction due to the pressure loss. After 3hs' aging under 250℃, tensile strength and yield strength are significantly increased from 351.1MPa and 200.7MPa to 380.5MPa and 246.9MPa respectively. While the elongation decreases first from 13.77% to 5.5% after 1h' aging, and then, recover to 11.48%. In addition, the effect of cooling methods on the mechanical properties is insignificant.

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“…5c). Similar structures have been observed by B.S.Wang [17] in die cast AM60B alloy as the fast shot velocity is low and the biscuit is too thin to effectively feed the castings.…”

Section: Effect Of Fast Shot Velocitysupporting

confidence: 79%

Injection Parameters Optimization and Artificial Aging of Automotive Die Cast Aluminum Alloy

Hu¹

2015

Materials and Manufacturing Processes

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“…The traditional research methods for the porosity in HPDC castings are quantitative analysis techniques based on two-dimensional (2D) metallographic observation. [9][10][11] Recently, three-dimensional (3D) porosity visualization studies have been extensively carried out through reconstruction from montage serial 2D sections 12,13) or high resolution X-ray computed tomography technology. [14][15][16][17] These quantitative analysis techniques make it possible to measure the porosity level with high accuracy, whereas their applications are limited to 2D metallographic sections or small-size specimens cut from HPDC castings.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Density and Microstructural Features in Vacuum Die Cast AZ91D Magnesium Alloy

2017

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Vacuum die castings of AZ91D magnesium alloy were produced at different slow shot speeds and the correlation between density and microstructural features in the vacuum die castings were investigated. The density was measured by using Archimedes method. The microstructure was analyzed with optical microscope, scanning electron microscopy and image analysis software. It was found that the partially solidi ed gate can be early closed-off by large-size particles at low enough slow shot speeds, which causes high levels of porosity in the vacuum die castings and thus low densities of the castings. Archimedes method is not suitable for evaluating the porosity level in the vacuum die castings. Besides the porosity levels, the densities of the vacuum die castings are related to the ESCs contents in the castings and solidi cation conditions in the shot sleeve at the beginning of die lling.

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“…Measurement results at the side of sprue indicates that q max and h max could reach 9.2 MW•m . Due to this high velocity, the interfacial heat flux at the end of T 1 could firstly reach a highest value 7.92 MW•m -2 among the ends of T n (n=2, 3,4,5). In addition, the q max and h max values of T 2 , T 4 and T 5 finger-plates increase with the increasing thickness of the finger plate.…”

mentioning

confidence: 98%

“…When HPDC molten alloy is injected into a relatively cold cavity of a die, the solidification rate is highly dependent on the interfacial heat transfer behavior in both the die and the molten alloy [3] , and subsequently influences the microstructure and the consequent mechanical properties of the final product [4][5][6][7] . In other words, a proper high cooling rate could favor the formation of fine microstructure in produced castings.…”

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confidence: 99%

Interfacial heat transfer behavior at metal/die in finger-plated casting during high pressure die casting process

Yu¹,

Liu²,

Cao³

et al. 2017

China Foundry

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H igh pressure die casting (HPDC) is extensively used for mass production, due to the high productive efficiency of a desired component in a rapid solidification speed [1,2] . When HPDC molten alloy is injected into a relatively cold cavity of a die, the solidification rate is highly dependent on the interfacial heat transfer behavior in both the die and the molten alloy [3] , and subsequently influences the microstructure and the consequent mechanical properties of the final product [4][5][6][7] . In other words, a proper high cooling rate could favor the formation of fine microstructure in produced castings. Otherwise, too rapid a cooling rate could cause the premature solidification of the molten metal before the filling completion.Many studies have been carried out to investigate Abstract: Heat transfer at the metal-die interface has a great influence on the solidification process and casting structure. As thin-wall components are extensively produced by high pressure die casting process (HPDC), the B390 alloy finger-plate casting was cast against an H13 steel die on a cold-chamber HPDC machine. The interfacial heat transfer behavior at different positions of the die was carefully studied using an inverse approach based on the temperature measurements inside the die. Furthermore, the filling process and the solidification rate in different finger-plates were also given to explain the distribution of interfacial heat flux (q) and interfacial heat transfer . Due to this high velocity, the interfacial heat flux at the end of T 1 could firstly reach a highest value 7.92 MW•m -2 among the ends of T n (n=2,3,4,5). In addition, the q max and h max values of T 2 , T 4 and T 5 finger-plates increase with the increasing thickness of the finger plate. Finally, at the rapid decreasing stage of interfacial heat transfer coefficient (h), the decreasing rate of h has an exponential relationship with the increasing rate of solid fraction (f).Key words: high pressure die casting (HPDC); interfacial heat transfer behavior; metal/die interface; solidification speed; solid fraction CLC numbers: TG146.1

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Effects of shot speed and biscuit thickness on externaly solidified crystals of high-pressure diet cast AM60B magnesium alloy

Cited by 32 publications

References 6 publications

Injection Parameters Optimization and Artificial Aging of Automotive Die Cast Aluminum Alloy

Injection Parameters Optimization and Artificial Aging of Automotive Die Cast Aluminum Alloy

Correlation between Density and Microstructural Features in Vacuum Die Cast AZ91D Magnesium Alloy

Interfacial heat transfer behavior at metal/die in finger-plated casting during high pressure die casting process

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