Effect of Ti on Phase Transformation and Grain Evolution in Nb/v Microalloyed Steel

Abstract

Low-carbon Nb/V microalloyed steels are extensively used for pipeline construction due to a good combination of mechanical properties and weldability. Austenite/ferrite transformation and grain size evolution during cooling after hot rolling is pivotal to obtaining desired properties. in this study, phase transformation and grain size evolution in two as-cast Nb/V microalloyed low-carbon steels billets were investigated with and without Ti additions, utilizing a quenching dilatometer. Significant ferrite grain morphology changes were observed in Ti-added steel at 10 and 1°C/s cooling rates. Mechanisms of observed changes were discussed and compared with thermodynamic/kinetic predictions.

Department(s)

Materials Science and Engineering

Second Department

Mechanical and Aerospace Engineering

Comments

Medical Research Council, Grant None

Keywords and Phrases

Acicular Ferrite; Bainite Phase Transformation; Dilatometry; Pinning Agent; Quasi-Ferrite

International Standard Book Number (ISBN)

978-093076725-9

International Standard Serial Number (ISSN)

1551-6997

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Association for Iron and Steel Technology, All rights reserved.

Publication Date

01 Jan 2024

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