Farrow, Russell John (1981). Mechanical properties of sintered low alloy steels. Masters thesis, Aston University.
Abstract
Published literature relating to the mechanical properties of sintered low alloy steels, is reviewed. The relationship between processing schedule and mechanical properties, in particular, fracture toughness, of a sintered, commercially available, low alloy steel was investigated. Three sintering treatments were compared, namely : 1). Reducing atmosphere sinter in a laboratory tube furnace 2). Vacuum sinter in a laboratory furnace 3). Reducing atmosphere sinter in an industrial mesh belt furnace. A number of test pieces were examined in the fully heat treated condition. The application of the potential drop technique in COD testing for determining the onset of fracture in the material was investigated and was also found to be reliable for monitoring the crack length during fatigue pre-cracking of the test pieces. This enabled some fatigue data to be obtained. This data, however, proved to be of limited use due to the comparatively short length of fatigue crack produced for the subsequent fracture toughness test. The results presented and discussed include fracture toughness and fatigue properties, tensile tests, hardness, metallography and fractography. The applicability of Linear Elastic Fracture Mechanics,‘and the subsequent use of the J integral concept, as a means of assessing fracture toughness is also discussed. Fracture toughness values ranged from 14,5 to 32MNm -3/2 which compare with the results of other workers, and, for comparison, are of the same order as published values for flake graphite cast irons.Fracture toughness was found to be directly related to yield stress.Vacuum sintering produced improved tensile properties, with a corresponding effect on fracture toughness at the higher densities only. Test procedures used by previous workers created several anomalies,and the investigation has resulted in recommendations on test procedures for sintered materials. No physico-chemical differences between laboratory and industrial reducing atmosphere sintering were revealed,
| Publication DOI: | https://doi.org/10.48780/publications.aston.ac.uk.00014463 |
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| Divisions: | College of Engineering & Physical Sciences > Aston Institute of Materials Research (AIMR) |
| Additional Information: | Copyright © RUSSELL JOHN FARROW, 1981. RUSSELL JOHN FARROW 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: | powder metallurgy,fracture mechanics,sintering,porosity |
| Last Modified: | 24 Feb 2025 16:13 |
| Date Deposited: | 22 Feb 2011 12:07 |
| Completed Date: | 1981-10 |
| Authors: |
Farrow, Russell John
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