Determination of annealing parameters of brass alloy to achieve high deformability

Mjedi su legure bakra i cinka koje mogu sadržavati i manje količine drugih metala. Zbog dobrih mehaničkih svojstava, lake obradivosti i otpornosti na koroziju mjedi imaju vrlo široku primjenu. U prošlosti, legure mjedi su se masovno proizvodile u vojnoj industriji za izradu streljiva, najčešće za izradu čahura raznih kalibara. U današnje se vrijeme od njih najviše izrađuju limovi, cijevi i šipke koje se koriste u građevinarstvu i strojogradnji. U teorijskom dijelu rada opisan je sastav i namjena mjedi, uz primjere njegove primjene. U eksperimentalnome dijelu ovog rada mjedeni uzorci su podvrgnuti toplinskoj obradi žarenjem, te su određeni parametri toplinske obrade kod koje se postizala najviša deformabilnost. Nakon provedene toplinske obrade, uspješnost postupka je potvrđena analizom mikrostrukture i mehaničkih svojstava uzoraka.Brass is an alloy of copper and zinc with small amount of other alloying metals (in some cases). Due to brass good mechanical properties, easy machinability and corrosion resistance brass have a very wide applications. Brass alloys used to be widely used in the military industry in the production of ammunition, most commonly for making cartridge cases of different calibers. Nowadays, they are most used for sheets, pipes and rods used in construction and mechanical engineering. The theoretical part of the paper describes the composition and implications of brass alloys, with examples of its application. In the experimental part, samples were subjected to annealing heat treatment with the purpose of finding optimal parameters at which the highest deformability can be achieved. After the heat treatment, the success of the procedure was analysed by the microstructure and mechanical properties of the samples