Ghosh, D.C. (1976). Fracture Toughness and Fatigue Resistance of a Range of Sintered Steels. PHD thesis, Aston University.
Abstract
A range of notched, sintered maraging and diluted maraging steel compacts have been fatigue tested in three point bending with two levels of notch root radii. The number of cycles to produce a detectable fatigue crack correlated well with an empirical parameter of the form ( ΔK/ p0.3), thereby minimising the banding effect, possibly characteristic in these sintered steels. Decreased fatigue resistance have been observed with increased sintered density above a eritical porosity level. Comparatively higher crack growth rate have been found in the highly diluted maraging steel compacts due to the presence of soft ferrite in the matrix, which largely superseded the crack blunting effect due to porosities. The micromechanism of fracture was of ductile dimple type in every case. In the sintered materials tested so far, including some sintered specimens of the Ancoloy SA (Hoganas) variety, the increase in toughness value with the increased yield stress seemed to be the basic trend - a trend which would carry them into competition with the high-strength wrought steels.
| Publication DOI: | https://doi.org/10.48780/publications.aston.ac.uk.00021148 |
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| Divisions: | College of Engineering & Physical Sciences > Aston Institute of Materials Research (AIMR) |
| Additional Information: | Copyright © D.C. Ghosh, 1976. D.C. Ghosh asserts their moral right to be identified as the author of this thesis. This copy of the thesis has been supplied on condition that anyone who consults it is understood to recognise that its copyright rests with its author and that no quotation from the thesis and no information derived from it may be published without appropriate permission or acknowledgement. If you have discovered material in Aston Publications Explorer which is unlawful e.g. breaches copyright, (either yours or that of a third party) or any other law, including but not limited to those relating to patent, trademark, confidentiality, data protection, obscenity, defamation, libel, then please read our Takedown Policy and contact the service immediately. |
| Institution: | Aston University |
| Uncontrolled Keywords: | fracture,toughness,resistance,sintered,steels |
| Last Modified: | 04 Feb 2025 15:43 |
| Date Deposited: | 14 Feb 2014 10:30 |
| Completed Date: | 1976-12 |
| Authors: |
Ghosh, D.C.
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