Untersuchung des zweiten Duktilitätsminimums mikrolegierter Stähle mit einer neu entwickelten Heißzugprüfung View Full Text


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Article Info

DATE

2012-08-31

AUTHORS

Dragan Djuric, Ozan Caliskanoglu, Dominik Leidinger, Sergiu Ilie, Christof Sommitsch

ABSTRACT

The chemical composition as well as the temperature cycles and forces arising during the continuous casting process have a decisive influence on the microstructural evolution and therefore on the ductility behaviour of microalloyed steels. During the bending and straightening operation, typically in a temperature range between 700 °C and 1100 °C, the ductility of the continuous cast product is reduced, which often leads to transversal surface cracks. In the present paper this “second ductility minimum” of microalloyed steels with various titanium contents was investigated by means of an in-house developed hot tensile testing method at the Institute for Materials Science and Welding (Graz University of Technology). The technique provides an investigation of the high temperature properties of in-situ solidified steel samples and facilitates new insights into the materials behaviour with focus on the solidification process (“on-cooling” tests), generating microvoids and cracks similar to continuous casting conditions, as well as more or less identical microstructures and precipitation processes. In contrast to conventional hot tensile tests in literature, where an improvement of the ductility by the addition of the micro-alloying element titanium could be observed, this behaviour could not be noticed with the present investigation in the case of the steel with a higher titanium-amount. More... »

PAGES

296-300

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00501-012-0026-7

DOI

http://dx.doi.org/10.1007/s00501-012-0026-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1009505326


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