Abstract
Naval brasses consisting of the α–β duplex phases are a special kind of Cu-Zn alloys. They are known to have excellent corrosion resistance to sea water and marine conditions. The aim of this study is the investigation of properties and behaviours of naval brass parts formed by different casting processes. A medium leaded naval brass alloy with 60 % Cu, 39 % Zn and 1 % Pb approximate composition was used. Several samples were subjected to mechanical testing by means of tensile and hardness tests. Light optical microscopy with image analyser and scanning electron microscopy were used for microstructure observations. The corrosion test was applied in sea water conditions. Results reveal that besides hot forging also casting is a very suitable technique for naval brass shaping. Casting does not have a negative effect on the most important property corrosion resistance. Furthermore, the obtained mechanical properties are satisfactory.
Kurzfassung
Seewasserfeste Messinge, die aus den α–β-Duplexphasen bestehen, sind eine besondere Art von Cu-Zn-Legierung. Sie besitzen bekanntermaßen eine hervorragende Korrosionsbeständigkeit gegen Meerwasser und marine Bedingungen. Dieser Beitrag dient der Untersuchung der Eigenschaften und Verhaltensweisen von durch verschiedene Gussverfahren hergestellten seewasserfesten Messingteilen. Es wurde eine durchschnittlich verbleite, seewasserfeste Messinglegierung mit einer ungefähren Zusammensetzung von 60 % Cu, 39 % Zn und 1 % Pb verwendet. Mehrere Proben wurden mittels Zugversuchen und Härtetests mechanisch geprüft. Für die mikrostrukturellen Beobachtungen wurden ein Lichtmikroskop mit Image Analyser und ein Rasterelektronenmikroskop verwendet.
Die Korrosionsprüfung fand unter Meerwasserbedingungen statt. Die Ergebnisse zeigen, dass neben dem Warmschmieden auch das Gießen ein geeignetes Verfahren für das Formen von seewasserfestem Messing ist. Das Gießen hat keine negativen Auswirkungen auf die wichtigste Eigenschaft, die Korrosionsbeständigkeit. Außerdem sind die erzielten mechanischen Eigenschaften zufriedenstellend.
About the authors
Mehmet Türker was born in 1974 and studied Welding Technologies, Manufacturing, Materials Science, and Casting Technologies. He is Assistant Professor at the Turkish Naval Academy in Istanbul, Turkey, and works currently as a Guest Researcher at the ISF-Institut für Schweißtechnik und Fügetechnik at RWTH Aachen, Germany.
Zekeriya Yasar Comert was born in 1977 and studied Materials Science, Casting Technologies and Powder Metallurgy at Yıldız Technical University in Istanbul, Turkey.
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