Functional Gradation of Low Alloy Steel by Differentially Controlled Phase Transformation

In the present study, the phase transformation behaviour of 51CrV4 steel was investigated both in an actual flange forming process and under idealized isothermal bainitic transformation conditions. The results demonstrated that superimposed external stresses have only a minor effect on the kinetics...

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Bibliographic Details
Published in:Steel research international 2008-02, Vol.79 (2), p.105-110
Main Authors: Maier, Hans J., Tschumak, Sergej, Weidig, Ursula, Steinhoff, Kurt
Format: Article
Language:English
Subjects:
bainite
differential thermo‐mechanical treatment
Distortion
Flanges
functionally graded materials (FGM)
microstructure
phase transformation
Phase transformations
Plasticity
Strain
Structural steels
tailored properties
temperature field evolution
transformation plasticity
Transformations
Transmission electron microscopy
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Summary:In the present study, the phase transformation behaviour of 51CrV4 steel was investigated both in an actual flange forming process and under idealized isothermal bainitic transformation conditions. The results demonstrated that superimposed external stresses have only a minor effect on the kinetics of the phase transformation, whereas strains resulting from transformation plasticity were significant. Transmission electron microscopy revealed a preferential alignment of the bainite with respect to the external loading direction. This selection of favourably oriented variants in turn causes macroscopic strains. Understanding and minimizing these strains are a key factor in designing functionally graded components with minimum distortion.
ISSN:1611-3683
1869-344X
DOI:10.1002/srin.200806324