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Interaction Of Grain Boundary Dislocations With Precipitates During High Temperature Creep
Author(s) -
Dunlop G. L.,
Nilsson J.O.,
Howell P. R.
Publication year - 1979
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1979.tb00195.x
Subject(s) - climb , materials science , creep , grain boundary , intergranular corrosion , bowing , alloy , metallurgy , austenite , stress (linguistics) , precipitation , composite material , condensed matter physics , crystallography , thermodynamics , microstructure , philosophy , physics , theology , linguistics , meteorology , chemistry
SUMMARY The interactions between grain boundary dislocations (GBDs) and intergranular TiC precipitates in an austenitic stainless steel (Alloy 800) have been investigated after creep at very low stresses at 800°C. The absence of Orowan looping suggests that the GBDs by‐pass the precipitates by glide/climb in the particle/matrix interfaces. An approximate calculation shows that the stress for bowing of GBDs between TiC precipitates is consistent with a measured value of the threshold stress for diffusion creep. However, it is suggested that an additional factor may be present in the threshold stress due to attractive forces between the precipitates and the GBDs.