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The influence of wall thickness on the microstructure of bronze BA1055 with the additions of Si, Cr, Mo and/or W

Pisarek B. P.

Archives of Foundry Engineering

2008

Vol. 8, iss. 4

185-192

Abrasive wear of BA1055 bronze with additives of Si, Cr, Mo and/or W

Pisarek B. P.

Archives of Foundry Engineering

2008

Vol. 8, iss. 3

209-216

Aluminium bronzes belong to the high-grade constructional materials applied on the put under strongly load pieces of machines, about good sliding, resistant properties on corrosion both in the cast state how and after the thermal processing. It moves to them Cr and Si in the aim of the improvement of their usable proprieties. The additions Mo and/or W were not applied so far. It was worked out therefore the new kind of bronzes casting including these elements. Make additions to the Cu-Al-Fe-Ni bronze of Si, Cr, Mo and/or W in the rise of these properties makes possible. The investigations of the surface distribution of the concentration of elements in the microstructure of the studied bronze on X-ray microanalyzer were conducted. It results from conducted investigations, that in the aluminium bronze BA1055 after makes additions Si, Cr, Mo and/or W the phases of the type [kappa]_Fe, [kappa]_Ni crystallize, probably as complex silicides. Elements such as: Fe and Si dissolve first of all in phases [kappa], in smaller stage in the matrix of the bronze; Mn, Ni and W they dissolve in matrix and phases [kappa]. It dissolves Cr and Mo in the larger stage in phases [kappa] than in the matrix. The sizes of the abrasive wear were compared in the state cast multicomponent new casting Cu-Al-Fe-Ni bronzes with the additives Cr, Mo or W with the wear of the bronze CuAl10Fe5Ni5Si. The investigations of the wear were conducted on the standard device. It results from conducted investigations, that make additions to bronze BA1055 of the additives of Si, Cr, Mo, and/or W it influences the rise of the hardness (HB) of the bronze in the cast state, in the result of the enlarged quantity separates of hard phases [kappa], and in the consequence the decrease of the abrasive wear. The addition of molybdenum made possible obtainment of the microhardness of the phase [alpha] and [gamma]_2 on the comparable level. From the microstructure of the bronze CuAl10Fe5Ni5MoSi is characterizes the smallest abrasive wear among studied bronzes. More far works over new multicomponent aluminium bronzes will be guided in the direction of the identification of the changes of mechanical properties of studied bronzes under the influence of the thermal processing.