CREEP CAVITATION IN A NICR STEEL

Through creep tests at 823 K and intermittent cryogenic separation of grain boundaries of a NiCr steel with well-defined secondary stage creep, the continual cavity nucleation and diffusive growth models based on the linear relation between the cavity number and creep strain were examined. A one-dimensional (1-D) model[1] can predict rupture times within a factor of 2 and their stress exponents accurately and was supported by the stress dependence of the Monkman-Grant product. The area fraction of fully coalesced area (FCA) increased linearly with the density change of specimens and rupture occurred at FCA approximately 0.5. Then, by treating FCA as a damage parameter and applying the Avrami equation, it was shown that the extended area of FCA was proportional to sigma(2n)t3, which led to t(f) approximately sigma(2n/3).
Publisher
MINERALS METALS MATERIALS SOC
Issue Date
1992-01
Language
ENG
Keywords

RANDOMLY DISTRIBUTED CAVITIES; INTERGRANULAR FRACTURE; CONTINUOUS NUCLEATION; DIFFUSIVE CAVITATION; RUPTURE; GROWTH; BICRYSTALS

Citation

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v.23, no.1, pp.201 - 210

ISSN
0360-2133
URI
http://hdl.handle.net/10203/60026
Appears in Collection
NE-Journal Papers(저널논문)
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