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- W108279034 abstract "The toughness of low-alloy Ni--Mo powder metallurgy hot-deformed ferrous compacts was investigated. It was found that impact properties of hot deformed low alloy ferrous compacts fabricated from preforms having a density significantly below 6.2 g/cm/sup 3/ can be comparable to those of compacts fabricated from preforms having the previously suggested optimal density of 6.2 g/cm/sup 3/. The presence of grain boundary carbides in hot deformed ferrous compacts, while undoubtedly deleterious, cannot in itself explain the fact that these P/M products generally have impact properties inferior to those of their cast and wrought equivalents. The presence of raised and depressed features on the Charpy impact fracture surfaces of the low alloy compacts studied suggests that interparticle separation can occur in Ni--Mo as well as Cr--Mn hot deformed ferrous compacts. The impact behavior of the low-alloy compacts studied appears to be strongly effected by the presence of mixed structures and high oxygen contents. Since a change in fracture mode between fracture toughness and Charpy samples was observed, the Charpy impact test cannot be discarded in favor of the fracture toughness test, which is inappropriate if the fracture mode is sensitive to loading rate. The Charpy impact test is probably the best testmore » for evaluating crack propagation in hot deformed low-alloy P/M products which are loaded both monotonically as well as cyclically. (JRD)« less" @default.
- W108279034 created "2016-06-24" @default.
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- W108279034 date "1975-01-01" @default.
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- W108279034 title "Toughness and crack propagation in fully dense hot deformed ferrous compacts" @default.
- W108279034 hasPublicationYear "1975" @default.
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