Publication

Predicting Hot Tearing in Aluminium Castings

Jean-Marie Drezet
2000
Journal Articles

Abstract

In many casting processes, some stages, such as the starting phase in the direct chill casting of aluminium alloys, are particularly critical because of the propensity of some alloys to develop either hot tears which initiate at non zero liquid fraction, or cold cracks which nucleate and grow exclusively in the solid metal. Figure 1 shows a cracked rolling sheet ingot: two hot tears initiated during the starting phase of casting have grown up as the ingot was further cast. For some very sensitive alloys, up to 10 % of the ingots present some cracks and have to be remelted.

Official source

https://infoscience.epfl.ch/entities/publication/9265df76-63a0-4a78-835d-d28a26588b0f

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Jean-Marie Drezet
2000
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/9265df76-63a0-4a78-835d-d28a26588b0f

About this result

Related concepts (26)

Metal casting

In metalworking and jewelry making, casting is a process in which a liquid metal is delivered into a mold (usually by a crucible) that contains a negative impression (i.e., a three-dimensional negative image) of the intended shape. The metal is poured into the mold through a hollow channel called a sprue. The metal and mold are then cooled, and the metal part (the casting) is extracted. Casting is most often used for making complex shapes that would be difficult or uneconomical to make by other methods.

Aluminium alloy

An aluminium alloy (or aluminum alloy; see spelling differences) is an alloy in which aluminium (Al) is the predominant metal. The typical alloying elements are copper, magnesium, manganese, silicon, tin, nickel and zinc. There are two principal classifications, namely casting alloys and wrought alloys, both of which are further subdivided into the categories heat-treatable and non-heat-treatable. About 85% of aluminium is used for wrought products, for example rolled plate, foils and extrusions.

Die casting

Die casting is a metal casting process that is characterized by forcing molten metal under high pressure into a mold cavity. The mold cavity is created using two hardened tool steel dies which have been machined into shape and work similarly to an injection mold during the process. Most die castings are made from non-ferrous metals, specifically zinc, copper, aluminium, magnesium, lead, pewter, and tin-based alloys. Depending on the type of metal being cast, a hot- or cold-chamber machine is used.

Related publications (3)

Predicting Hot Tearing in Aluminium Castings

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Modeling the equilibrium vacancy concentration in multi-principal element alloys from first-principles

Direct chill and electromagnetic casting of aluminium alloys: Thermomechanical effects and solidification aspects

Validation of a new hot tearing criterion using the ring mould test