Influence of Boron on Mechanical Properties and Microstructures of Hot-Rolled Interstitial Free Steel

S.I. Kim; Shi Hoon Choi; Yeon Chul Yoo

doi:10.4028/www.scientific.net/MSF.495-497.537

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HomeMaterials Science ForumMaterials Science Forum Vols. 495-497Influence of Boron on Mechanical Properties and...

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.

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Materials Science Forum (Volumes 495-497)

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537-542

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.495-497.537

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Online since:

September 2005

Authors:

S.I. Kim, Shi Hoon Choi, Yeon Chul Yoo

Keywords:

Dynamic Recrystallization (DRX), Electron Backscatter Diffraction (EBSD), Ferrite Grain Size, Hot Strip Rolling, Interstitial Free Steel

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