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Erschienen in: Metallography, Microstructure, and Analysis 2/2018

26.02.2018 | Technical Article

Effects of Thermo-mechanical Process Parameters on Microstructure and Crystallographic Texture of High Ni–Mo Ultrahigh Strength Steel

verfasst von: G. Mandal, S. K. Ghosh, D. Chakrabarti, S. Chatterjee

Erschienen in: Metallography, Microstructure, and Analysis | Ausgabe 2/2018

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Abstract

A novel low-carbon micro-alloyed steel has been developed with ultrahigh strength (UTS ~ 1700 MPa), satisfactory ductility (total elongation ~ 13%) and impact toughness (25 J/cm2 at − 40 °C) for light-weight applications in automobile, aerospace and defence sectors. The effect of finish rolling temperatures (850–750 °C) and cooling rate (air cooling versus water quenching) on the evolution of microstructure and crystallographic texture and finally on the mechanical properties of thermo-mechanically controlled processed steel has been studied. A refinement in mixed microstructure comprised of granular/lower bainite and lath/plate martensite and an intensification of Goss and rotated Goss texture components were found with the decrease in finish rolling temperature and increase in cooling rate. Interaction of fine-scale carbide/carbonitride precipitates of Nb and Ti with the dislocation substructure present within bainite and martensite contributed significant precipitation strengthening to the steel.

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Metadaten
Titel
Effects of Thermo-mechanical Process Parameters on Microstructure and Crystallographic Texture of High Ni–Mo Ultrahigh Strength Steel
verfasst von
G. Mandal
S. K. Ghosh
D. Chakrabarti
S. Chatterjee
Publikationsdatum
26.02.2018
Verlag
Springer US
Erschienen in
Metallography, Microstructure, and Analysis / Ausgabe 2/2018
Print ISSN: 2192-9262
Elektronische ISSN: 2192-9270
DOI
https://doi.org/10.1007/s13632-018-0432-7

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