Paper Title:
Influence of Boron on Mechanical Properties and Microstructures of Hot-Rolled Interstitial Free Steel
  Abstract

This paper examines an effect of boron (B) on dynamic softening behavior, mechanical properties and microstructures for Nb-Ti added high strength interstitial free (IF) steel. For this purpose, IF steels containing 0ppm B, 5ppm B and 30ppm B were chosen. Continuous cooling compression test was performed to investigate dynamic softening behavior. Mechanical properties and microstructures of pilot hot-rolled IF steel sheet were analyzed by uni-axial tensile test and electron back-scattered diffraction (EBSD). It was found that no-dynamic recrystallization temperature (Tndrx) which can be determined from the relationship between flow stress and temperature is a constant of 955oC for all IF steels. However, an addition of B into IF steels increases work hardening rate at the temperature below Tndrx. It was also verified that B retards phase transformation of austenite into ferrite. EBSD analysis revealed that absence of B induces fine ferrite grain size and many high angle grain boundaries.

  Info
Periodical
Materials Science Forum (Volumes 495-497)
Edited by
Paul Van Houtte and Leo Kestens
Pages
537-542
DOI
10.4028/www.scientific.net/MSF.495-497.537
Citation
S.I. Kim, S. H. Choi, Y. C. Yoo, "Influence of Boron on Mechanical Properties and Microstructures of Hot-Rolled Interstitial Free Steel ", Materials Science Forum, Vols. 495-497, pp. 537-542, 2005
Online since
September 2005
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Price
$32.00
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