The effect of Nb on the strain rate and temperature dependent behaviour of quenching & partitioning steels

Journal Article (2021)
Author(s)

Florian Vercruysse (Universiteit Gent)

C. Celada-Casero (Tata Steel Europe Limited, TU Delft - Team Maria Santofimia Navarro)

Bernd M. Linke (ThyssenKrupp Steel Europe AG)

P. Verleysen (Universiteit Gent)

R. H. Petrov (Universiteit Gent, TU Delft - Team Kevin Rossi)

Research Group
Team Kevin Rossi
DOI related publication
https://doi.org/10.1016/j.msea.2020.140293
More Info
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Publication Year
2021
Language
English
Research Group
Team Kevin Rossi
Volume number
800

Abstract

In present study, the potential of Niobium (Nb) to improve the mechanical properties of Quenched and Partitioning (Q&P) steels is investigated. To this purpose, the effect of the addition of Nb on the microstructure and mechanical properties of a Q&P steel was thoroughly analysed with special attention on the thermal stability of the retained austenite. The mechanical properties of the Nb Q&P steel were determined using static and dynamic tensile tests and compared to the properties of a Nb free Q&P steel. Additionally, the effect of test temperature was quantified by static and dynamic tests in the temperature range from −40 °C to +80 °C. It was found that the Nb induced grain refinement together with the stabilising effect of Nb on the retained austenite, resulted in an excellent low temperature behaviour of the Nb Q&P steel. Additionally, the high temperature, dynamic behaviour of the Nb micro-alloyed steel was improved with respect to the Nb free steel due to the presence of a large fraction of retained austenite with low thermal stability.

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