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Material parameters affecting degradation processes of Al-brasses in pipe systems

Liptáková T., Lovíšek M., Hadzima B., Dundeková S.

Archives of Materials Science and Engineering

2015

Vol. 76, nr 1

27--34

Purpose: As construction material of cooling pipe systems there are often used Al-brasses because their high thermal conductivity, mechanical workability and corrosion resistance. In the pipes liquid media of various chemical compositions are flowing by different rates. It means that the material is loaded mechanically also chemically what results in synergy effect on degradation. Susceptibility to corrosion-erosion damage of four Al-brasses manufactured by different producers is investigated because in operation conditions they have different reliability and lifetime. Design/methodology/approach: By studying of their microstructure, surface state, selected mechanical properties and corrosion characteristics the parameters which affected chemicalmechanical degradation were evaluated. Experimental methods are SEM, EDX and spectral analyses, measurement of microhardness and roughness. Findings: By actual obtained results it was identified that in spite of very similar chemical composition differences in mechanical and corrosion behaviour are affected by technology of manufacturing. It can explain their different durability in operating conditions. Research limitations/implications: To identify more precisely the main parameters important for degradation resistance in various flow media the original experimental device is designed and constructed. The device makes possible to test Al-brasses in various flowing media by the same mail at three flowing rates. By long time lasted experiments in the one it is able to simulated operation specification. Results of the device are not presented yet because they are just in progress. Practical implications: Obtained results will be very helpful for choice of Al-brasses for required operation conditions according important properties which were experimentally verified. Originality/value: It means contribution to economy by material saving in operation by available choice and design and construction of original experimental device.

Wpływ modyfikacji na strukturę i udarność mosiądzu aluminiowego CuZn30Al3

Romankiewicz F., Romankiewicz R.

Prace Instytutu Odlewnictwa

2013

T. 53, z. 3

53--57

Badania nad modyfikacją mosiądzu aluminiowego CuZn30Al3 wykazały, że stosowane łącznie dodatki 0,01−0,02% boru i 0,025−0,05% tytanu spowodowały korzystną zmianę struktury badanego stopu. W efekcie tego nastąpił istotny wzrost udarności mosiądzu spowodowany zmianą charakteru przełomu. Zwiększył się udział przełomu plastycznego.

Studies on the modification of aluminum brass CuZn30Al3 have shown that the additives used in combination 0.01−0.02% boron and 0.025−0.05% titanium resulted in a favorable change in the structure of the tested alloy. As a result, there has been a significant increase in impact strength caused by changes in the character brass breakthrough. There has been an increase in the contribution of the ductile fracture.