Using elastic energy considerations to explain rafting in Ni-based superalloys with a high gamma volume fraction

Simple item page
dc.contributor.authorCress, Catherine Marion
dc.date.accessioned2018-04-06T12:55:05Z
dc.date.available2018-04-06T12:55:05Z
dc.date.issued1993
dc.descriptionA Dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, for the Degree of Master of Scienceen_ZA
dc.description.abstractA simple three-dimensional model of a high y' volume fraction Ni-based alloy is developed. The model is based on the idea that a unit volume in the superalloy can be represented by a cuboidal precipitate with thin 'slabs' of matrix material 'stuck' onto its faces in such a way that coherency is maintained. Rafting is investigated by considering the changes in total energy whon the cuboidal precipitates start to flatten into plate shapes or lengthen into rod shapes. It is assumed that inelastic effects are negligible. Internal and external stresses and strains are determined. Expressions for the derivative of the total energy with respect to a shape parameter are then calculated in the absence of applied stress and in the presence of applied stress. Predictions of rafting behaviour are made for six alloys. Excellent agreement is found with experimental evidence but it is suggested that the agreement is fortuitous.en_ZA
dc.description.librarianAC 2018en_ZA
dc.identifier.urihttps://hdl.handle.net/10539/24291
dc.language.isoenen_ZA
dc.subjectHeat resistant alloys.en_ZA
dc.subjectNickel alloys.en_ZA
dc.titleUsing elastic energy considerations to explain rafting in Ni-based superalloys with a high gamma volume fractionen_ZA
dc.typeThesisen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
Cress Catherine Marion._Using elastic energy consi.pdf
Size:
1.6 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
ETD Collection