Effects Of Fe-Mg Content And Heat Treatment On Machinability Of Al-Si Alloy

Die casting aluminum-silicon alloy has the advantages of good mechanical properties and small tendency of thermal cracking and shrinkage porosity, and is widely used in automobile wheel hubs, engine cylinder blocks, aircraft parts, etc. Affected by the die-casting process, a large number of pores are easily generated inside the aluminum-silicon alloy die-casting, and bubbling will appear on the surface of the casting after heat treatment, which will lead to the scrapping of the die-casting.

The vacuum die casting method is supplemented by vacuuming the cavity on the basis of the ordinary die casting process, which fundamentally reduces or even eliminates the original gas content, thereby improving the mechanical properties and surface quality of the die casting, and is an effective method to reduce the internal pores of the die casting. . Pintejin Ceramics has modern production lines and sophisticated testing equipment, and conducts product development and production in strict accordance with national standards.

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The strength of the alloy is often increased by adding copper elements to prepare aluminum-silicon alloys by ordinary die-casting processes, but this reduces the toughness of die-castings. The Al8Mg3FrSi6 phase can be precipitated from the structure of the aluminum-silicon alloy containing magnesium, which can greatly improve the strength and toughness of the casting. Iron has a high degree of dispersion in aluminum-silicon alloys and is the most common harmful impurity element in aluminum-silicon alloys. Iron oxides mixed in during the melting process.

It can be seen that it is of practical engineering significance to study the effects of iron and magnesium elements on Al-Si alloys, but the current research in this area is not in-depth. To this end, the authors prepared Al-Si alloys with different Fe and Mg contents by ordinary die casting and vacuum die casting, and performed solution aging heat treatment on them. The effects of Fe and Mg contents and heat treatment on the microstructure and tensile properties of the alloy were studied. .

The test raw materials are aluminum ingot (purity not less than 99.80%), magnesium ingot (purity not less than 99.9%), Al-20Fe master alloy, and XD-LJK refining agent.

The Al-Si alloy design composition shown was batched and smelted using a resistance crucible furnace. Before smelting, all tools such as crucibles in contact with the melt need to be painted. Heat the crucible to 250-300 °C, add aluminum ingots and magnesium ingots, and place the magnesium ingots on the aluminum ingots; after the alloy is melted, add Al-20Fe master alloy at 720-730 °C, and keep warm after the alloy is completely melted.

The alloy melt was stirred during the heat preservation process for 30 min; at 710-720 °C, the melt was purified with a refining agent; after standing for 20 min, the slag was removed; at 700-720 °C, the alloy melt was poured into the 1 in the cavity of the DCC630M vacuum die casting system. The alloys of each composition were poured three times respectively under the conditions of ordinary die casting and vacuum die casting (cavity pressure of 10 MPa). Die casting process parameters such as.

The obtained die-casting samples were treated by solution aging (530℃×3h+60～100℃ water quenching+190℃ aging) to study the effect of heat treatment on the tensile properties of the alloy.

The room temperature tensile test was carried out on a CMT-5105 universal testing machine at a tensile speed of 1 mm·min-1.Dimensions of tensile test specimens

The metallographic sample was cut from the die-casting sample, and the microstructure of the die-casting sample was observed by OLYMPUS GX41 optical microscope and XJP-6A optical microscope (OM). The corrosive agent was 0.5% (volume fraction) HF solution The microstructure was observed by VEGA II LMU scanning electron microscope (SEM); the phase composition was analyzed by D/max 1200 X-ray diffractometer, and the phase was determined by the PDF card in MDI jabe5.0 software. The flow samples and mold-filling samples obtained during the die-casting test were used for the determination of flow properties and mold-filling ability, respectively.

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