Actions for Microstructural evaluation of a ferritic stainless steel by small angle neutron scattering. [Fe9Cr1Mo with V, Nb additions].

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Microstructural evaluation of a ferritic stainless steel by small angle neutron scattering. [Fe9Cr1Mo with V, Nb additions].

Author
Kim, S.
Published
United States : [publisher not identified], 1983
Springfield, Va.: National Technical Information Service, [approximately 1983]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Glinka, C. J., Jones, W. B., Sikka, V., Spooner, S., and Weertman, J. R.

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Summary
The material studied is Fe9Cr1Mo modified by the addition of small amounts of V and Nb. The major changes detected by the neutrons are alterations in size, number and composition of the carbides. SANS measurements of samples aged 5000 h at various temperatures showed that aging at 538/sup 0/C produces a maximum in the scattering cross section. Aging at this temperature also maximizes hardness. Size distributions of the carbides derived from inversion of the SANS data show that 538/sup 0/C results in the largest number of small carbides. Higher aging temperatures lead to appreciable carbide coarsening. SANS measurements of samples deformed at 649/sup 0/C showed that microstructural changes can be detected after only a few hours of fatigue. High voltage electron microscopy studies have shown that the major microstructural changes produced by high temperature exposure are carbide coarsening, subgrain development, and a drastic decrease in dislocation density.
Report Numbers
DE84009487; SAND-84-0055C; CONF-8310205-9
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC04-76DP00789
OSTI Identifier 5035836
Research organization: National Bureau of Standards, Washington, DC (USA). Reactor Div.
Research organization: Northwestern Univ., Evanston, IL (USA). Dept. of Materials Science and Engineering.
Research organization: Oak Ridge National Lab., TN (USA).
Research organization: Sandia National Labs., Albuquerque, NM (USA).
View MARC record | catkey: 47339215