Paper Title:

Characterization of Nano-Scale Particles in Hot-Rolled, High Strength Low Alloy Steels (HSLA)

Periodical Materials Science Forum (Volumes 561 - 565)
Main Theme PRICM 6
Edited by Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages 2083-2086
DOI 10.4028/www.scientific.net/MSF.561-565.2083
Citation Ilana B. Timokhina et al., 2007, Materials Science Forum, 561-565, 2083
Online since October, 2007
Authors Ilana B. Timokhina, Peter D. Hodgson, Simon P. Ringer, Rong Kun Zheng, Elena V. Pereloma
Keywords Atom Probe Tomography (APT), High Strength Low Alloy HSLA Steel, Precipitation Hardening, TEM, Yield Strength
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The contribution of nano-scale particles observed using Atom Probe Tomography in an increase of yield strength of conventional and advanced HSLA steels was studied. The advanced HSLA steel showed higher yield strength than conventional HSLA steel. There were two types of carbides, which primarily contribute to an increase in yield strength of conventional HSLA steel: (i) coarse TiC with average size of 25±5nm and (ii) fine TiC with average radius of 3±1.2nm. The presence of two types of carbides was found in the microstructure of advanced HSLA steel: (i) nano-scale Ti0.98Mo0.02C0.6 carbides with average radius of 2.2±0.5nm, and (ii) C19Cr7Mo24 particles with an average radius of 1.5±0.3nm. The contribution of precipitation hardening in the yield strength of advanced HSLA steel due to the nano-scale particles was 174MPa, while this value in the conventional HSLA steel was 128MPa.

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