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- W144651168 abstract "The effects of composition and microstructure on the slow strain rate tensile (epsilon = 4.4 x 10/sup -5/ sec /sup -1/) and creep ductility have been determined for a series of high purity CrMoV steels. Four different compositions were tested: undoped (HP) material, Mn + P doped (MnP), P doped (P) and Sn doped (Sn). All samples had a tempered bainitic microstructure, a hardness of R/sub c/ 20 or 28, a grain site of ASTM 0 or 3, and some samples were step cooled prior to testing. The tensile ductility at low temperatures (below 200/sup 0/C) is controlled by the extent of cleavage fracture and at higher temperatures it is controlled by the amount of intergranular cavitation. At intermediate temperatures (approx. 500/sup 0/C) the MnP material is the most ductile, the HP and Sn material is the least ductile, and the p material has an intermediate ductility. The effects of dopants on the creep ductilities at 500/sup 0/C were the same as those observed for the tensile ductility at 500/sup 0/C. The effects of hardness on the creep ductility are due to the relative deformation rates of the grain boundaries and matrix, i.e., a lower hardness results in more intragranularmore » plasticity and a higher ductility. The effect of prior austenite grain site on creep ductility is not a grain size effect, per se, but is an effect of austenitization temperature: a higher austenitization temperature (and hence a larger grain size) lead to the dissolution of more sulfides. This results in a ductility loss due to segregated sulfur and/or fine sulfides in the grain boundaries. The effects of dopants are rationalized in terms of the effects of impurity segregation on grain boundary cavitation.« less" @default.
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- W144651168 date "1983-11-01" @default.
- W144651168 modified "2023-09-27" @default.
- W144651168 title "Impurity-induced embrittlement of rotor steels. Volume 2. Creep embrittlement. Final report" @default.
- W144651168 hasPublicationYear "1983" @default.
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