Study on improvement of casting conditions for some aluminum bronze alloys

الملخص EN

Two types of aluminum bronze alloys have been studied to determine the proper methods of melting and casting in two different conditions; with treating materials as Albral 2, Logas 50 and deoxidizing tube E3) and without and determine the effects of these conditions on mechanical properties of alloys.

These alloys are :- a) Aluminum bronze alloys (AB1).

b) Nickel-aluminum bronze alloys (AB2).

These alloys were produced using different melting processes and cast method.

The first one was made by preparing the charge materials to be melted and then, to the cast process without using any types of additions and treatment materials.

The second one was made with casting conditional control, using proper techniques of casting and using protective layers to minimize the oxidation and other casting defects.

The molten metal’s from both processes were poured into two types of moulds; sand and metal moulds, both types were in dimensions (Ø100 × 250) mm.

The final products of each type of alloys in each type of conditions were used to perform many types of inspections; chemical analysis, visual test, structure examinations, hardness test and tensile test.

The results of all processes and inspections show that the properties of alloys which were treated and cast in metal moulds were better than that cast in sand moulds.

These alloy castings are free from shrinkage cavities, inclusions and porosities due to using suitable sequence in alloy contents melting, no overheat, reducing the melting time, selecting non-turbulence casting method and suitable selection of pouring temperatures.

The mechanical properties (hardness and ultimate tensile strength) for treated nickel-aluminum bronze alloys (T-AB2) were better than that for other alloys.