Study of the Effect of Composition and Thermal Deformation Treatment on Properties of Ferritic Steels Microalloyed with Titanium and Niobium. Part 1. Microstructure Characteristics

The effect of composition and thermal deformation processing (finishing temperature of rolling and coiling, cooling rate after rolling) parameters on the mechanical properties and structure of advanced Ti, Mo micro-alloyed structural (automobile sheet) ferritic steels is studied. It is established t...

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Bibliographic Details
Published inMetallurgist (New York) Vol. 63; no. 5-6; pp. 487 - 495
Main Authors Koldaev, A. V., Zaitsev, A. I., Krasnyanskaya, I. A., D’yakonov, D. L.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.09.2019
Springer
Subjects
Characterization and Evaluation of Materials
Chemistry and Materials Science
Iron compounds
Materials Science
Mechanical properties
Metallic Materials
Titanium
microstructure
thermal deformation processing
ductility
strength
composition
ferritic steels
acicular ferrite
precipitation hardening
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Summary:The effect of composition and thermal deformation processing (finishing temperature of rolling and coiling, cooling rate after rolling) parameters on the mechanical properties and structure of advanced Ti, Mo micro-alloyed structural (automobile sheet) ferritic steels is studied. It is established that the strength characteristics of steel increase regularly with increasing Ti content within appropriate limits and additional microalloying with molybdenum. The resultant structural state is primarily determined by the cooling rate after steel hot rolling. At relatively low values of 10–15 °C/sec polygonal ferrite is formed, and on increasing up to 30 °C/sec formation of a high dislocation acicular ferrite is observed. The expediency of reducing carbon content to 0.04–0.06 wt.% is demonstrated.
ISSN:0026-0894
1573-8892
DOI:10.1007/s11015-019-00849-0