<p> The fracture behaviour of a medium strength bainitic steel
(SAE 4340 in the 11 as transformed and in the "warm rolled" condition) .
and four carbon-manganese structural steels (in the hot rolled ferritepearlite
condition) was investigated. The purpose was to isolate those
features of the microstructure which exert control over the fracture
properties. </p> <p> The detailed nature of the microstructure of the steels was
studied with transmission and scanning electron microscopy, qualitative
x-ray analysis and quantitative metallography. An attempt was made
to correlate the fracture behaviour with the microstructure through models
which relate to the structure properties to the unnotched tensile properties. </p> <p> In the case of the bainitic steels it was found that the carbide
morphology, dislocation substructure and prior austentite grain size have
the major influence on fracture properties. In contrast, the fracture
properties of the structural steels were controlled by the volume fraction
of inclusions and to some extent by the shape of the inclusions. </p> / Thesis / Master of Engineering (MEngr)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/19924 |
| Date | 05 1900 |
| Creators | Osborne, Donald |
| Contributors | Embury, J. D., Metallurgy and Materials Science |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
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