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A series of twelve Cr-Mo white irons varying in carbide volume from 7 to 45 pct were tested for dynamic fracture toughness
and wet sand abrasion resistance. Carbon content was varied from 1.4 to 3.9 pct. Two matrix microstructures were employed,
and the compositions (copper and chromium content) were varied to assure constant matrix compositions. Chromium was varied
from 11.6 to 25.7 pct. In addition, one composition of white iron was subjected to thirty different heat treatments to define
the effect of matrix microstructure on dynamic fracture toughness and abrasion resistance. It was shown that for the abrasive
wear system used, a carbide volume of about 30 pct represented an optimum quantity, above which abrasion resistance decreased.
Martensitic irons provided consistently better abrasion resistance than austenitic irons. Dynamic fracture toughness decreased
with carbide volume, as expected. Higher toughness values were obtained with predominantly austenitic matrix microstructures
than with predominantly martensitic matrix microstructures. Considering both abrasion resistance and fracture toughness, it
was shown that heat treated irons could provide an optimal combination of these properties.
Formerly Visiting Research Metallurgist, Climax Molybdenum Co. Research Laboratory. 相似文献
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