A technique for the preparation of iron containing a fine
dispersion of thoria particles has been developed. The method involves
co-precipitation, hydrogen reduction and hot rolling in a reducing
atmosphere at 1373°K.
The mechanical properties of iron and iron-thoria strip have
been investigated over the temperature range 77-373°K. The dispersion
increased the strength and work hardening rate of iron, and reduced
the ductility . The yield strength of the alloy has been explained in
terms of dislocation multiplication rates and the stress dependence of
dislocation velocity. The work hardening rate is regarded as a balance
between the yield stress behaviour at low temperatures and recovery
processes at the higher temperatures.
The mechanics of neck and Luders band formation have been
examined, and the observed fracture angles explained in terms of this
analysis.
The ductile-to-brittle transition temperature was found to
be improved in the iron-thoria, as a consequence of both a finer grain
size and the direct influence of the particles. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/41215 |
| Date | January 1969 |
| Creators | Place, Thomas Alan |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
Page generated in 0.0165 seconds