INVESTIGADORES
ROSENBERGER Mario Roberto
congresos y reuniones científicas
Título:
Effect of the solidifying structures on the wear resistance of Zn-Al alloys
Autor/es:
MARIO ROBERTO ROSENBERGER; SCHVEZOV, C. E.; ARES, A.E.
Lugar:
Filadelfia
Reunión:
Conferencia; 18 International conference on wear of materials, WOM 2011; 2011
Resumen:
The effect of the
solidifying structures on the wear resistance of Zn-Al alloys is analyzed; for
that reason, ingots of diluted Zn-Al alloy (4 %wt and less) were performed in a
directional cooling furnace to obtain cylindrical ingots with three regions:
one with columnar grains, other with equiaxed grains and in the middle other
with a mix of both grains called the Columnar-to-Equiaxed Transition (CET). A
representative sample of each region was cut and tested by wear resistance. The
dry sliding wear resistance is measured in a pin on ring machine; using a
carbon steel disk as counterface, which rotate at 2.7 m/s as tangential
velocity while the sample is pressed at 32,4 N of load. The wear resistance
were analyzed and compared with the grains size and the secondary spacing of
the dendrites. The wear resistance of the equiaxed regions is larger than the
resistance for the columnar and transition regions. In all the regions the wear
resistance increase when the aluminum concentration increase. At large aluminum
composition the wear resistance of equiaxed and columnar regions are the same.
A clear relation is observed between the wear resistance and the secondary
dendritic spacing, when increase the spacing decrease the wear resistance. The
equiaxed region has the larger values of wear resistance and the columnar the
less for the same spacing. On the other hand, at lower and larger spacing the
wear resistance of the all the structures converge