Abstract
The paper presents a technology of layered castings based on the use of a method of mould cavity preparation via spatial skeleton insert. The insert was created as a result of application of 3D printing selective laser melting method. The studied spatial skeleton insert, made from CP2 Ti powder, was placed into the mould cavity directly before pouring grey cast iron. The scope of the conducted studies covered metallographic research using a light microscope and scanning electron microscope with EDS analysis, hardness measurements and abrasive wear resistance tests. The obtained results show that the interaction between the solid spatial skeleton insert and liquid alloy allowed for the production of a casting of pearlitic grey cast iron with flake graphite, containing a surface layer reinforced with titanium carbides. In consequence, a local increase in hardness was obtained and, moreover, an increase in abrasive wear resistance of the whole surface layer of the casting.
Highlights
The technology of layered castings becomes more and more popular, when the criterion for highly usable properties concerns only the working surface layer and the rest of the casting is only a base part that is not exposed to a direct influence of factors causing abrasive or corrosion wear
The element that enriches the surface of the casting is placed in a mould in the form of a granular[6,7,8,9] or monolithic[10,11,12,13,14,15] insert, directly before molten metal is poured
Results and Discussion was relatively low, whereas in case of thickness ratio 4:1, the insert was fully filled with liquid cast iron and good bond between the two parts of a layered casting (Figure 3) was achieved. This results from the fact that the thickness ratio of at least 4:1 makes it possible to overcome cooling impact of the insert effect on the liquid metal that solidifies
Summary
The technology of layered castings becomes more and more popular, when the criterion for highly usable properties concerns only the working surface layer and the rest of the casting is only a base part that is not exposed to a direct influence of factors causing abrasive or corrosion wear. According to this manufacturing method, the bimetallic elements of hammer[3] or ball[4] mills are cast in material configurations of an abrasive wear resistant chromium cast iron working layer with a ductile low-carbon cast steel base, whereas application of the second technology allows to obtain relatively small elements in steel-cast iron configuration.[5] the basis of the technology of layered castings made using the liquid–solid system is a so-called method of mould cavity preparation In this manufacturing method, the element that enriches the surface of the casting is placed in a mould in the form of a granular[6,7,8,9] or monolithic[10,11,12,13,14,15] insert, directly before molten metal is poured. According to this manufacturing method, the bimetallic elements of runners[6,7] or lining plates[13,14] are cast in material configurations, connecting an abrasion and corrosion resistant high-alloy stainless steel or Cr base alloy working layer with a grey cast iron or carbon cast steel base
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