The Significance of Optimizing Mn-Content in Tuning the Microstructure and Mechanical Properties of δ-TRIP Steels

The δ-TRIP steel has attracted a lot of attention for its potential application in automotive components, owing to the low density, good combination of strength, and ductility. As the difficulty in yield strength further increasement is caused by large fraction ferrite, the work hardening ability wa...

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Published inMetals (Basel ) Vol. 11; no. 3; p. 523
Main Authors Xu, Baoyu, Chen, Peng, Li, Zhengxian, Wu, Di, Wang, Guodong, Guo, Jinyu, Liu, Rendong, Misra, R. D. K., Yi, Hongliang
Format Journal Article
LanguageEnglish
Published MDPI AG 01.03.2021
Subjects
bainitic transformation
in-situ EBSD
mechanical properties
retained austenite
δ-TRIP steels
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Abstract The δ-TRIP steel has attracted a lot of attention for its potential application in automotive components, owing to the low density, good combination of strength, and ductility. As the difficulty in yield strength further increasement is caused by large fraction ferrite, the work hardening ability was enhanced by optimizing the manganese (Mn)-content in this study. Three δ-TRIP steels with different manganese (Mn)-content were designed to explore the significant effect of Mn content on the work hardening behavior in order to develop high strength steel suitable for the industrial continuous annealing process. The detailed effect of Mn on microstructure evolution and deformation behavior was studied by scanning electron microscope (SEM), interrupted tensile tests, X-ray diffraction (XRD), and in-situ electron backscattered diffraction (EBSD). The study suggested that 2 Mn steel has the lowest degree of bainitic transformation, as a result of fine grain size of prior austenite. The large TRIP effect and dislocation strengthening improve the work hardening rate, resulting in 2 Mn steel exhibiting comparable mechanical properties with the QP980 steels. The retained austenite in 1.5 Mn steel progressively transformed into martensite and sustained the strain to a high strain value of 0.40, showing a good strength-ductility balance.
AbstractList The δ-TRIP steel has attracted a lot of attention for its potential application in automotive components, owing to the low density, good combination of strength, and ductility. As the difficulty in yield strength further increasement is caused by large fraction ferrite, the work hardening ability was enhanced by optimizing the manganese (Mn)-content in this study. Three δ-TRIP steels with different manganese (Mn)-content were designed to explore the significant effect of Mn content on the work hardening behavior in order to develop high strength steel suitable for the industrial continuous annealing process. The detailed effect of Mn on microstructure evolution and deformation behavior was studied by scanning electron microscope (SEM), interrupted tensile tests, X-ray diffraction (XRD), and in-situ electron backscattered diffraction (EBSD). The study suggested that 2 Mn steel has the lowest degree of bainitic transformation, as a result of fine grain size of prior austenite. The large TRIP effect and dislocation strengthening improve the work hardening rate, resulting in 2 Mn steel exhibiting comparable mechanical properties with the QP980 steels. The retained austenite in 1.5 Mn steel progressively transformed into martensite and sustained the strain to a high strain value of 0.40, showing a good strength-ductility balance.
Author Wang, Guodong
Yi, Hongliang
Xu, Baoyu
Chen, Peng
Liu, Rendong
Li, Zhengxian
Wu, Di
Misra, R. D. K.
Guo, Jinyu
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  ident: ref_26
  article-title: Low temperature kinetics of bainite formation in high carbon steels
  publication-title: Acta Mater.
  doi: 10.1016/j.actamat.2013.01.044
  contributor:
    fullname: Sourmail
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Snippet The δ-TRIP steel has attracted a lot of attention for its potential application in automotive components, owing to the low density, good combination of...
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SubjectTerms bainitic transformation
in-situ EBSD
mechanical properties
retained austenite
δ-TRIP steels
Title The Significance of Optimizing Mn-Content in Tuning the Microstructure and Mechanical Properties of δ-TRIP Steels
URI https://doaj.org/article/1dae6f1e222e45e4b9b9b1039ee625bb
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