Abstract
High pressure die casting is one of the leading casting processes in the modern industry. In the case of high pressure die casting, the melt is in contact with the tool, whereas the chemical interaction between the tool, made of hot-work tool steel and the melt occur. In addition, mechanical and heat wear of the tools also occur. For high productivity high resistance to these factors is required. The interaction between molten aluminium alloys Al99.9, Al99.7 and AlSi12 and hot-work tool steel UTOPMO1 was investigated at various experimental temperatures, i.e. 670 °C and 700 °C, whereas the differential scanning calorimetry was used. Optical and scanning electron microscopy were used in order to analyse interaction layer. The result of the interaction is the growth of a reaction layer, which is formed from intermetallic phases from Al–Fe or Al–Fe–Si systems. Reaction layer varies regarding the aluminium alloy and the temperature, to which it is exposed, whereas it is composed of three or four different layers. The thickness of the interaction layer depends only from the temperature, but the number of different layers in the interaction layer depends from the type of the aluminium alloy.
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