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Influence of microalloying elements (Nb, V, Ti) on yield strength in bainitic steels

AuthorsRancel, Lucía; Gómez, Manuel; Medina, Sebastián F.
KeywordsMicroalloying elements
CCT diagrams
Dilatometric tests
Bainitic microstructure
Issue Date2008
CitationSteel Research International 79 : 947-953 (2008)
AbstractIn order to study the influence of microalloying elements in bainitic high strength steels, seven steels with different contents of V, Ti, Nb and N were investigated. The steel 35 CrMo 4 (C=0.38; Mn=0.82; Si= 0.25; Cr=0.83; Mo=O. 17, all in wt.%) was used as reference steel. CCT diagrams were determined by dilatometric tests at different cooling rates, and the maximum and minimum cooling rates for bainite formation were determined. With regard to tensile tests, the presence of precipitates in the bainitic microstructure contributed to raising their yield strength, as was found by comparing the results for all the steels with the reference steel which did not contain microalloying elements. The yield strength can be predicted by an Orowan expression.
Publisher version (URL)http://dx.doi.org/10.2374/SRI08SP064
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