A new dropper-type gas flow measuring method based on weighing principle

High pressure die casting (HPDC) is a widely used casting technology for product that is made of light metal such as aluminum alloy. During die casting process the molten metal is injected into a mold at high speed and solidify under high pressure. The amount of porosity in the cast part is an important question. Lots of technologies have been developed to minimize porosities, for example, vacuum-assisted high pressure die casting process (VPDC). In this paper, AlSi9Cu3(Fe) aluminum alloy castings were produced by conventional HPDC with atmospheric venting and VPDC process under three different absolute cavity air pressures of 170 mbar, 90 mbar and 70 mbar at the cavity. The influence of absolute cavity air pressure on the porosity and on the mechanical properties of the castings were investigated and compared with conventional HPDC casting method. The results of the present study proved that the amount of porosity and the pore sizes in the castings can be significantly reduced from 1.10% at an atmospheric level to 0.47% at 70 mbar. This corresponds to 57% reduction. As a result, the mechanical properties are improved significantly, particularly, the tensile strength from 271.6 MPa to 299.8 MPa, which corresponds to 10% increment and the elongation from 1.66% to 2.49%, which shows 50% increment. At lower absolute cavity air pressure the entrapped gases become the final gas porosities in the die castings and shows solidification shrinkage form inspected with scanning electron microscopy. In general, lower cavity air pressure contributes to reduce the pores, which improve the mechanical properties of die casting.

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The effect of vacuum degree on the porosity and mechanical properties of die cast AlSi₉Cu₃(Fe) alloy

Szalva¹,

Orbulov

2018

Resolution and Discovery

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AlSi 9 Cu 3 (Fe) aluminum alloy specimens were produced by conventional high-pressure die casting (HPDC) and vacuum-assisted high-pressure die casting (VPDC) processes under atmospheric and 3 different absolute pressures of 170 mbar, 90 mbar, and 70 mbar. The influence of absolute pressure in the die cavity on the porosity and mechanical properties of the die castings were investigated and compared with the traditional casting method. The life data analysis was applied to deal with the variation in mechanical properties of the die cast flat tensile specimens. The porosity of castings was assessed on the basis of X-ray observation and density measurements performed by Archimedes method. The fracture surfaces were examined by scanning electron microscopy (SEM), and the chemical composition was measured by energy dispersive X-ray analysis (EDX). The investigations proved that the volume of gas porosity and the pore sizes in the castings can be significantly reduced by using vacuum assistance during the die casting process. Based on the data presented in the study, the porosity reduced from 1.10% at an atmospheric level to 0.47% at 70 mbar, which corresponds to 57% reduction. The boundary condition of the present investigation is the porosity content higher than 0.40% and lower than 1.10%. As a result, the density and the mechanical properties, particularly the tensile strength (10%) and elongation (50%) were significantly improved. The specimens contained smaller pores under lower pressure. Meanwhile, the shape of pores is found to be also an important factor, affecting the mechanical properties. In general, higher vacuum degree contributes to the reduction the porosity, which would be the basis to improve the mechanical properties of die cast parts.

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A new dropper-type gas flow measuring method based on weighing principle

Cited by 3 publications

References 9 publications

The Effect of Vacuum on the Mechanical Properties of Sand Cast AA6061 Alloy

The Effect of Vacuum on the Mechanical Properties of Sand Cast AA6061 Alloy

The Effect of Vacuum on the Mechanical Properties of Die Cast Aluminum AlSi9Cu3(Fe) Alloy

The effect of vacuum degree on the porosity and mechanical properties of die cast AlSi₉Cu₃(Fe) alloy

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A new dropper-type gas flow measuring method based on weighing principle

Cited by 3 publications

References 9 publications

The Effect of Vacuum on the Mechanical Properties of Sand Cast AA6061 Alloy

The Effect of Vacuum on the Mechanical Properties of Sand Cast AA6061 Alloy

The Effect of Vacuum on the Mechanical Properties of Die Cast Aluminum AlSi9Cu3(Fe) Alloy

The effect of vacuum degree on the porosity and mechanical properties of die cast AlSi9Cu3(Fe) alloy

Contact Info

Product

Resources

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The effect of vacuum degree on the porosity and mechanical properties of die cast AlSi₉Cu₃(Fe) alloy