Development of Low Carbon Microalloyed Ultra High Strength Steels

Abstract:

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In the present study HSLA steels of varying carbon concentrations, alloyed with Mn, Ni, Cr, Mo, Cu and micro-alloyed with Nb and Ti were subjected to different finish rolling temperatures from 850oC to 750oC in steps of 50oC. The microstructure of the steel predominantly shows martensite. Fine twins, strain induced precipitates in the martensite lath along with e-Cu precipitates are observed in the microstructure. With an increase in carbon content the strength value increases from 1200MPa UTS to 1700MPa UTS with a negligible reduction in elongation. Impact toughness values of 20-26 joules at room temperature and −40oC were obtained in sub-size samples.

Info:

Periodical:

Materials Science Forum (Volumes 500-501)

Edited by:

J.M. Rodriguez-Ibabe, I. Gutiérrez, B. López and A. Iza-Mendia

Pages:

551-558

DOI:

10.4028/www.scientific.net/MSF.500-501.551

Citation:

A. Ghosh et al., "Development of Low Carbon Microalloyed Ultra High Strength Steels", Materials Science Forum, Vols. 500-501, pp. 551-558, 2005

Online since:

November 2005

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Price:

$35.00

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