Paper Titles
Formability of Ultrafine Grained Steel
p.3543
Effect of Grain Refinement on Mechanical Properties in 25Cr-1N Austenitic Steel
p.3549
Development of 780MPa Grade Steel Plate by Microstructural Control Containing M-A through the On-Line Heating Process
p.3555
Effect of Hot and Cold Rolling on Grain Size and Texture in Fe-Si Strips with Si-Content Larger than 2 wt%
p.3561
Control of the Austenite Recrystallization in Niobium Microalloyed Steels
p.3567
Precipitation Behavior of Steels with Various Copper during Continuous Cooling
p.3573
Temperature Development during Step-Wise Tensile Tests on a TRIP Steel
p.3579
Static and Impact-Dynamic Characterization of Multiphase TRIP Steels
p.3585
Microstructure and its Formation Mechanism of Weld Metal of Al-Bearing TRIP Steel
p.3591

Control of the Austenite Recrystallization in Niobium Microalloyed Steels

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Abstract:

The use of heavy gauge steel sheets for structural applications very often requires a combination of high yield strength and adequate toughness. The most cost effective way to realize a high yield strength and a high ductility in a low alloyed steel is grain refinement. In industrial practice, this refinement is realized by controlled processing. This process consists of controlling the slab reheating temperature, applying a large amount of hot deformation below the non-recrystallization temperature (Tnr) and accelerated cooling. A better knowledge of Tnr could optimize the process and the best mechanical properties could be reached against the lowest cost. Tnr can be raised by the addition of microalloying elements such as Nb. Nb can retard the static recrystallization of austenite at low temperatures either by solute drag or by precipitation pinning. In this study, the recrystallization behavior of five Nb-microalloyed model alloys with various Nb contents, was evaluated by double hit compression tests. Further, the precipitation state of the materials was investigated experimentally by Inductively Couples Mass Spectroscopy and X-ray Diffraction. The construction of recrystallization-time-temperature diagrams and precipitation-time-temperature diagrams showed that both mechanisms, i.e. recrystallization and precipitation, strongly influence each other.

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Periodical:

Materials Science Forum (Volumes 638-642)

Pages:

3567-3572

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.3567

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Online since:

January 2010

Authors:

Stephanie Vervynckt, Kim Verbeken, Philippe Thibaux, Martin Liebeherr, Yvan Houbaert

Keywords:

Double Deformation, Nb Microalloyed Steel, Precipitation, Recrystallization

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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