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Medientyp:
E-Artikel
Titel:
Effect of Deformation Sequence and Coiling Conditions on Precipitation Strengthening in High Ti–Nb-Microalloyed Steels
Beteiligte:
Sesma, L. G.;
Lopez, B.;
Pereda, B.
Erschienen:
Springer Science and Business Media LLC, 2022
Erschienen in:
Metallurgical and Materials Transactions A, 53 (2022) 6, Seite 2270-2285
Sprache:
Englisch
DOI:
10.1007/s11661-022-06670-w
ISSN:
1073-5623;
1543-1940
Entstehung:
Anmerkungen:
Beschreibung:
Abstract In this work, multipass torsion tests followed by coiling simulations under different conditions have been performed with a reference Nb (0.03 pct) and a high Ti (0.1 pct)–Nb-microalloyed (0.03 pct) steel. In the case of the high Ti steel, estimated yield strengths close to or over 700 MPa were obtained for some of the conditions researched. However, a very significant effect of previous austenite grain size and strain accumulation on precipitation strengthening has also been observed. As a result, depending on deformation sequence and final cooling conditions, the coiling simulation temperatures that lead to the highest mechanical strength varied from 600 °C to 500 °C. The effect of increasing strain accumulation was mainly related to higher phase transformation temperatures, which led to a lower driving force for precipitation and higher microalloying element diffusivity, resulting in the formation of less and coarser precipitates.