Mechanism of Hot Ductility Improvement of a Peritectic Steel Containing Vanadium Using Very-High-Temperature Compression

  • Ahmad Rezaeian
  • Faramarz Zarandi
  • Steve Yue


The loss of hot ductility in the temperature range 700 °C to 1100 °C in carbon and low-alloy steels has been the subject of many investigations. Microalloyed steels with compositions near the peritectic have a coarse as-cast structure and large columnar grains that encourage grain boundary sliding, and also increase the crack aspect ratio and the density of the intergranular precipitates, resulting in loss of hot ductility and cracking during continuous casting. Recent work has shown that thermomechanical processing could improve the hot ductility of a hypoperitectic steel. In this study, a peritectic vanadium steel and also carbon steel as a reference were used to evaluate the hot ductility when the specimens were subjected to very high-temperature deformation. The tensile specimens were melted and solidified in situ on a 20 KN servohydraulic testing machine. Once the solidification was completed, compressive deformation was performed on the specimens in the temperature range 1400 °C to 1300 °C during cooling. The hot ductility was then evaluated using conventional isothermal testing at temperatures ranging from 700 °C to 1100 °C. It was found that applying such a deformation can refine the as-cast, dendritic structure, and consequently clean grain boundaries as a result of grain boundary migration, the latter being observed by Auger electron spectroscopy.


Ferrite Austenite Dynamic Recrystallization Auger Electron Spectroscopy Intergranular Fracture 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors are very grateful to the Natural Sciences and Engineering Research Council of Canada for the financial assistance and IPSCO Inc. for providing the necessary information and materials.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2008

Authors and Affiliations

  1. 1.Department of Mining and Materials EngineeringMcGill UniversityMontrealCanada

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