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Analysis of Structural State of 60/40 Brass Cartridge Case (BCC) after Being Exposed to High Pressure and Temperature of Firing

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Document pages: 15 pages

Abstract: This research presents an experimental and analytical study of thestructural state of the 60 40 brass cartridge case, (BCC) after being fired.The oral section of the BCC has the function of confining the gases of firingby expanding against the chamber and sealingthe gases. Firing conditions, namely, high pressure and temperature, 3000 bar and2727°C, respectively, affect performance properties of the (BCC). These areconfining and crack strengths. Experimental study was done on the oral section to address these effects on the structuraland mechanical properties of this brass. This alloy is a 60 copper (Cu) and 40 zinc (Zn) alloy and has a two-phase structure, alpha, (α) and beta, (β). Using “before and after” comparison approach; performance properties were tested in cartridge cases prepared before and after firing. These properties are hardness, tensile strength, micro-structural and chemical composition.Comparing the tests’ results, afterfiring demonstrated considerable degrading in performance properties, micro-structural disorderand a remarkable deficiency in the zinc element in the brass structure. Thisdeficiency affects the percentage of beta phase in the alloy which governs the strength of the brass. According to the required properties before firing,it was found that afterfiring, thebrass cartridge case is not qualified for reloading.

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