Effect of Annealing Time for Quenching CuAl7Fe5Ni5W2Si2 Bronze on the Microstructure and Mechanical Properties
This paper presents the influence of annealing time 30, 60 and 120 min at 1000°C for quenching CuAl7Fe5Ni5W2Si2 bronze in 10% water solution of NaCl, on the microstructure and mechanical properties. The presented results concern the species newly developed aluminum-iron-nickel bronze, with additions W and Si.
In order to determine changes in the microstructure of the hardened bronze metallographic studies were performed on cylindrical samples of diameter 10 mm, on the metallographic microscope with digital image analysis, X-ray phase analysis, EDX point with the digital recording on the computer. Specified percentage of the microstructure of martensite and bainite, participation of proeutectoid α phase in the microstructure, grain size of former β phase, the amount of dissolved κ phase.
It was found that in the microstructure of bronze in the cast state, there are a number of intermetallic phases of κ type. At interphase boundaries of primary intermetallic faceted precipitates, especially rich in tungsten (IM_W), nucleate and grow dendritic primary intermetallic κI phases, with chemical composition similar to the type of Fe3Si iron silicide.
Dissolved, during the heating, in the β phase are all the intermediate phase included in the microstructure, with the exception of primary intermetallic phases of tungsten and κI. Prolongation of the isothermal annealing causes coagulation and coalescence of primary phases. In microstructure of the bronze after quenching obtained the α phase precipitation on the grain boundary of secondary β phase, coarse bainite and martensite, for all annealing times. With the change of annealing time are changed the relative proportions of individual phases or their systems, in the microstructure. In the microstructure of bronze, hold at temperature of 1000°C for 60 min, after quenching martensitic microstructure was obtained with the primary phases, and the least amount of bainite.
Brezina P. (1973). Gefügeumwandlungen und mechanische Eigenschaften der Mehrstoff-Aluminiumbronzen vom Typ CuAl10 Fe5 Ni5. Giesserei-Forschung, 25 (3), 1-10.
Süry P., Oswald H. R. (1972). On the corrosion behavior of individual phases present in aluminium bronzes. Corrosion Science. 12 (1), 77-80. http://dx.doi.org/10.1016/S0010-938X(72)90581-1.
Culpan E. A., Rose G. (1978). Microstructural characterization of cast nickel aluminium bronze. Journal of Materials Science, 13 (8), 1647-1657. DOI: 10.1007/BF00548728.
Pisarek B. (2007). The crystallization of the bronze with additions of Si, Cr, Mo and/or W. Archives of Materials Science and Engineering. 28 (8), 461-466
Pisarek B. (2007). Influence Cr on crystallization and the phases transformations of the bronze BA1044. Archives of Foundry Engineering. 7 (3), 129-136.
Pisarek B. (2008) Abrasive wear of BA1055 bronze with additives of Si, Cr, Mo and/or W. Archives of Foundry Engineering. 8 (3), 209-216.
Pisarek B. (2008). The influence of wall thickness on the microstructure of bronze BA1055 with the additions of Si, Cr, Mo and/or W. Archives of Foundry Engineering. 8 (4), 185-192.
Pisarek B. (2010). Influence of the technology of melting and inoculation preliminary alloy AlBe5 on change of concentration of Al and microstructure of the bronze CuAl10Ni5Fe4. Archives of Foundry Engineering. 10 (2), 127-134.
Pisarek B. (2011). Effect of additions Cr, Mo, W and/or Si on the technological properties on the technological properties of aluminium-iron-nickel bronze. Archives of Foundry Engineering. 1 (3), 199-208.
Erdmann-Jesitzer F., Louis H., Petersen J. (1977). Kavitation von CuAl10 nach thermischer Vorbehandlung. Metall. 31, 59-63.
Fortina G., Leoni M. (1973). Compertamento alla corrosione in ambiante marino dei bronzi di alluminio al cobalto. Metallurgia Italiana. 6, 363-368.
Górny Z., Sobczak J. (2005). Nowoczesne tworzywa odlewnicze na bazie metali nieżelaznych. Kraków: ZA-PIS.
Kirk-Othmer (1999-2011). Copper alloys. Cast copper alloys. Encyclopedia of Chemical Technology. John Wiley & Sons, Inc. DOI: 10.1002/0471238961.
Pisarek B. (2011). Effect of two-stage isothermal annealing on microstructure CuAl10Fe5Ni5 bronze with additions of Si, Cr, Mo, W and C. Archives of Foundry Engineering. 11(Spec. Iss.2), 187-194.
Pisarek B. (2011). Simulation of volumetric shrinkage Sv and surface shrinkage Svp. Pietrowski S. (Eds.), Wysokojakościowe Technologie Odlewnicze, Material i Odlewy, (pp. 167-208), Katowice - Gliwice, PAN.