Abstract
A comparative investigation on the microstructural morphologies and hardness values of Cu-35 wt.% Zn and Cu-30 wt.% Zn with 1.5 wt.% Al content is provided. Distinctive specimens by using traditional investment casting were produced. Specimens withdrawn from distinct locations along the castings were thermally and microstructural analyzed. Thermally and chemically induced microstructural modifications affecting the microstructure and hardness are discussed. It is found that components (specimens) located at different positions along of the pattern tree casting have distinctive hardness values. This is associated with Cu segregation and cooling rate. It is also found that solidified piece under a cooling rate ~0.12 K/s has hardness 20% higher than the specimen solidified under 0.07 K/s. Duplex brass with Widmanstatten structure constitutes the resulting microstructure array. This seems to be associated with Al content, while both Zn and Al contents are associated with cooling rate as responsible parameter to induce Widmanstatten structure formation.
Highlights
In order to design the performance of manufactured component as a function of the processing variables, a combination of determined hall of properties is very important
The resulting microstructures clearly reveal that duplex phase (α plus β) are constituted
It is worth noting that all steps applied in the investment casting were very similar in order to obtain the examined samples
Summary
In order to design the performance of manufactured component as a function of the processing variables, a combination of determined hall of properties is very important. It is perceived that since the 80's decade there exists a lack of a contribution mixture between technical and scientific aspects directly focused on the jewelry industry This contribution should indicate a range of operational parameters such as melting temperature correlated with piece volume and dimension, the corresponding position of the piece inside the casting, which affects significantly the resulting macrosegregation, cooling rate, visual/surface quality, mechanical properties and gold-plating quality. In this sense, this proposed investigation reasonably corroborates in this direction based on their obtained experimental results. Since their operational parameters are discussed and possibly controlled, a certain cost and desired performance (e.g. hardness and surface polishing) correlated with cooling rate can be attained
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