Authors
Abstract
Two types of aluminium 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) Aluminium bronze alloys (AB1).
b) Nickel-aluminium 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 metals 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-aluminium bronze alloys (T-AB2)
were better than that for other alloys.
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