The End-Quench as a Screening Tool for Controlled Cooling of Hot-Rolled Plates of Potential Premium Rail Compositions
| Autor: | D. M. Fegredo, E. F. Connors, D. R. Kiff, W. A. Pollard |
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| Rok vydání: | 1983 |
| Předmět: | |
| Zdroj: | Canadian Metallurgical Quarterly. 22:453-473 |
| ISSN: | 1879-1395 0008-4433 |
| DOI: | 10.1179/cmq.1983.22.4.453 |
| Popis: | Current alloy premium rail chemistries have a relatively high hardenability which leads to welding problems. However, premium rails with a hardness of ∼Rc 38 are necessary in Canada because the high wear rate of standard C- Mn rails is inadequate on curved track under heavy duty conditions. In the present work, potential premium rail steels combining a hardness of Rc 38, a pearlitic microstructure, and acceptable weldability, were screened by end-quench experiments. Thus, 51 eutectoid, mainly lean-alloy steel compositions were evaluated, the results from which enabled a few compositions to be selected that gave a desirable combination of properties, at cooling rates between ∼105 and ∼180°C min −1 at 705°C. One-inch (25.4-mm) thick, hot-rolled plates of these compositions were then cooled, after rolling, at similar rates and their microstructures and mechanical properties determined. The results showed that cooling rates necessary to produce Rc 38 pearlite in the plates were comparable with those i... |
| Databáze: | OpenAIRE |
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