Intercritical Annealing Response of Medium Manganese Steels Having Different Carbon Concentrations

Tensile properties of intercritically annealed medium Mn steels containing 4.5 wt% manganese and two different carbon levels of 0.1 and 0.2 wt% are predicted using a composite iso‐strain model. In the predictions, the evolutions of phase fraction and retained austenite stability with annealing tempe...

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Bibliographic Details
Published in:Steel research international 2018-09, Vol.89 (9), p.n/a
Main Authors: Kang, Singon, Hofer, Robert W., Speer, John G., Krizan, Daniel, Matlock, David K., De Moor, Emmanuel
Format: Article
Language:English
Subjects:
Annealing
Austenite
Carbon
Dependence
Elongation
Intercritical annealing
Manganese steels
medium manganese steels
Microstructure
Predictions
Retained austenite
tensile deformation behavior
Tensile properties
Tensile strength
third generation AHSS
Ultimate tensile strength
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Summary:Tensile properties of intercritically annealed medium Mn steels containing 4.5 wt% manganese and two different carbon levels of 0.1 and 0.2 wt% are predicted using a composite iso‐strain model. In the predictions, the evolutions of phase fraction and retained austenite stability with annealing temperature are considered assuming ortho‐equilibrium phase fractions and full alloy partitioning during intercritical annealing. Predicted evolutions of ultimate tensile strength and uniform elongation values with variation in intercritical annealing temperature are compared to experimental results obtained following annealing for 1 h. The experimental results confirm the predicted dependence of the tensile properties on annealing temperature. While the product of ultimate tensile strength and uniform elongation has a linear relationship with the retained austenite fraction, experimental values exhibit a greater dependence on the retained austenite fraction than the predicted values. The evolution of tensile properties of intercritically annealed medium Mn transformation‐induced plasticity steels with the intercritical annealing temperature are predicted using a composite iso‐strain model. Predicted effect of carbon addition on the tensile property evolution of the medium Mn steel shows good correlation with corresponding experimental results obtained following annealing for 1 h.
ISSN:1611-3683
1869-344X
DOI:10.1002/srin.201800069