A new method of incipient melting temperature (IMT) detection, continuous heating and fracture (CHF) method, has been developed in which a constant strain rate tensile or torsion deformation is applied to a specimen whose temperature is simultaneously increased. The IMT is determined in a single test and any phase transformations before the IMT will also be detected by the effects on the stress vs. strain behavior in the same experiment. This method also provides information about the effect of phase transformation and temperature on the mechanical behaviour of steel near the incipient melting temperature. / By means of such tests, the incipient melting behaviour of a series of steels with carbon levels from 0.031 to 0.45 wt% was examined. For the steels containing 0.08-0.097%C and about 1.5%Mn, it was found that incipient melting occurs in the two phase ($ gamma$+$ delta$) region in the temperature range from 1470-1480$ sp circ$C, and is significantly influenced by microalloying elements. In the ultra-low carbon steel (0.031%C), the IMT is in the single phase $ delta$ region at 1495 $ sp circ$C, and for the medium carbon steels containing 0.3-0.42%C (hyper-peritectic) it is in the $ gamma$ single phase in the temperature range of 1401-1414$ sp circ$C. Comparison between the IMT obtained from CHF testing and the solidus temperature calculated from K-O model showed that these two values are extremely close. Since there is no nucleation barrier for melting, it seems that the CHF testing can delineate the solidus temperature in steel. (Abstract shortened by UMI.)
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.69719 |
| Date | January 1993 |
| Creators | Hassani, Farideddin |
| Contributors | Yue, S. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Mining and Metallurgical Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001384339, proquestno: AAIMM91824, Theses scanned by UMI/ProQuest. |
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