2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 2: Gudenau Intl. Symp. / Iron and Steel Making
| Editors: | Kongoli F, Kleinschmidt G, Pook H, Ohno K, Wu K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 340 pages |
| ISBN: | 978-1-987820-25-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Applying Innovative Technologies in Manufacturing Liquid Metal
Vladimir Tsepelev1;1BORIS YELTZIN URAL FEDERAL UNIVERSITY, Ekaterinburg, Russian Federation;
Type of Paper: Regular
Id Paper: 383
Topic: 2
Abstract:
Investigations on properties of steels and alloys in liquid and solid states testify that the technological features of the liquid metal manufacturing process, overheating in particular, affect the properties and structure of the metal. The time-temperature treatment of the liquid metal influences the structure of the metal melt. In its turn, the metal melt structure has its effect on the solidification nature and the properties of solid specimens.
It is pointed out that there is an inherent tendency for a number of steels and alloys: the higher the melt equilibrium ratio before crystallization, the higher the indices of the solid metal performance. Heating the melt is the easiest way of transferring it into the equilibrium state. In doing so, account should be taken of the fact that with a rise in temperature, the rate of the melt changing its state into that of equilibrium is non-monotonously increasing. Having reached a particular temperature which depends upon initial materials, the chemical composition and the production conditions, the melt properties most often change profoundly due to the active structure rearrangements of the short-range order.
Performance characteristics of steel and alloy semi-finished products depend not only on their composition and thermomechanical treatment after solidification, but are also attributed to the optimal time-temperature treatment conditions of the melt. The conditions are aimed at making the melt approach its equilibrium state. Commercial melting of 10X23N18 steel, made for the research purposes has shown that automatically operated time-temperature treatment of the liquid metal ensures the positive results to be achieved. In particular, the structural and chemical nonuniformity of the solid metal was decreased, while the quality of the steel macrostructure in the deformed state was improved. Plastic characteristics, density and impact strength were improved as well.
Keywords: alloy, properties, structure, equilibrium, crystallization