Paper Titles
Recrystallisation, Grain Growth and Texture Evolution in Nonoriented Electrical Steels
p.657
Topological Approach to Abnormal Grain Growth in three Dimensions
p.665
Novel Approaches to the Thermodynamis of Grain Boundaries and Grain Boundary Junctions
p.675
Controlling the Growth of Cu Particles through Semibatch Process
p.683
Ferrite Grain Refinement during Hot Rolling of Seamless Tubes
p.689
Determination of the Factors Controlling Crystallography Non-Conformance in Single Crystal Turbine Blade Production on an Industrial Scale
p.695
The Effects of Hot Band Annealing Temperature on the Texture of 1% an 2%Si Nonoriented Electrical Steels
p.701
Processing of FeCo Nanosized Soft-Magnetic Material by Powder Metallurgy Technique
p.707
Abnormal Grain Growth in Metals
p.717

Ferrite Grain Refinement during Hot Rolling of Seamless Tubes

Article Preview

Abstract:

Hot rolling of seamless tubes is performed in two stages: one at high temperature, ie, above 1000oC and a second part at low temperature range, namely below 900oC. Above 1000oC, dynamic, metadynamic and static recrystallization may happen leading to full softening and grain refinement. Below 900oC, however, some pancaking may occur and ferrite is thus refined during transformation. Nonetheless, in order to refine ferrite grains further, cooling to room temperature and re-austenitization at an intermediate reheating furnace can be a viable alternative to be explored. The present paper examines the implications of re-austenitization followed by phase transformation plus low temperature deformation on ferrite grain refinement. Phase transformation on re-heating and cooling as well as recrystallization play important roles in the process of ferrite grain refinement. These mechanisms are analyzed and discussed. Results indicate that ferrite grain refinement is most effective in the case of processing using a re-austenitization cycle in the intermediate furnace followed by rapid cooling after deformation in the stretch reducing mill.

You might also be interested in these eBooks
Recrystallization and Grain Growth III View Preview

Info:

Periodical:

Materials Science Forum (Volumes 558-559)

Pages:

689-694

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.558-559.689

Citation:

Cite this paper

Online since:

October 2007

Authors:

Ronaldo Barbosa, Dagoberto Brandão Santos, Marcelo A.C. Ferreira, R.N. Nolasco

Keywords:

Ferrite Grain Refinement , Hot Rolling, Hot Torsion Simulation, Seamless Tubes

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2007 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] L. N. Pussegoda, R. Barbosa, S. Yue and J. J. Jonas: J. Mater. Process. Technol. Vol. 25 (1991) p.69.

Google Scholar

[2] L. N. Pussegoda and J. J. Jonas: ISIJ Int. Vol. 31 (1991), p.278.

Google Scholar

[3] L. N. Puseegoda, S. Yue and J. J. Jonas: Metall. Trans. Vol. 21A (1990), p.153.

Google Scholar

[4] J. J. Jonas: ISIJ Int. Vol. 40 (2000), p.731.

Google Scholar

[5] F. Siciliano and J. J. Jonas: Metall. Mater. Trans. Vol. 31A (2000), p.511.

Google Scholar

[6] E. I. Poliak and J. J. Jonas: ISIJ Int. Vol. 43 (2003), p.684.

Google Scholar