Byun, JS Shim, JH Cho, YW Lee, DN 2024-01-21T09:05:06Z 2024-01-21T09:05:06Z 2021-09-03 2003-04-02 1359-6454 https://pubs.kist.re.kr/handle/201004/138654 The influence of Ti addition on the development of acicular ferrite microstructure during the gamma/alpha transformation in C-Mn steels has been studied. The optical microstructures of the heat-treated specimens with different Ti concentrations were characterized. Transmission electron microscopy analysis with thin foil specimens was carried out to investigate the phase composition of non-metallic inclusions and the local variation of chemical composition around the inclusions. It has been found that an acicular ferrite dominant microstructure could be produced when the Ti concentration is hi-her than about 50 ppm. The transition from the conventional bainitic microstructure to the interlocking acicular ferrite microstructure occurs in response to the change in the main-component of the non-metallic inclusions from Mn-Si oxide to Ti2O3. The Mn depleted zones around Ti2O3 particles were detected, which could explain how the intragranular nucleation is facilitated on Ti2O3 particles. (C) 2003 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD HEAT-AFFECTED ZONE LOW-ALLOY STEEL MEDIUM-CARBON STEELS ACICULAR FERRITE WELD METALS NONMETALLIC INCLUSIONS HAZ TOUGHNESS HSLA STEEL MICROSTRUCTURE TITANIUM Non-metallic inclusion and intragranular nucleation of ferrite in Ti-killed C-Mn steel Article 10.1016/S1359-6454(02)00560-8 1 ACTA MATERIALIA, v.51, no.6, pp.1593 - 1606 ACTA MATERIALIA 51 6 1593 1606 scie scopus 000181775300007 2-s2.0-0037413980 Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science Metallurgy & Metallurgical Engineering Article HEAT-AFFECTED ZONE LOW-ALLOY STEEL MEDIUM-CARBON STEELS ACICULAR FERRITE WELD METALS NONMETALLIC INCLUSIONS HAZ TOUGHNESS HSLA STEEL MICROSTRUCTURE TITANIUM steels nucleation transmission electron microscopy non-metallic inclusion