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High-resolution characterization of the martensite-austenite constituent in a carbide-free bainitic steel

Christina Hofer, Vitaliy Bliznuk (UGent) , An Verdiere (UGent) , Roumen Petrov (UGent) , Florian Winkelhofer, Helmut Clemens and Sophie Primig
(2018) MATERIALS CHARACTERIZATION. 144. p.182-190
Author
Organization
Abstract
The multiphase microstructure of carbide-free bainitic steels comprises bainitic ferrite laths, retained austenite with different morphologies, a minor fraction of carbides and so-called martensite-austenite areas, which partially transform during the last cooling step. While the other constituent received much attention, little is known about the structure of the martensite-austenite constituent in carbide-free bainitic steels. Thus, in this study, it was structurally and chemically investigated by high-resolution techniques such as transmission electron microscopy and atom probe tomography after preceded unambiguous identification by electron backscatter diffraction in conventional as well as transmission mode. The results, ranging from carbon segregation to cementite precipitation in the martensitic part, indicate strong auto-tempering during final cooling which is followed by aging. Also, some kind of structural modulation in the austenite belonging to the martensite-austenite areas was observed. Atom probe tomography revealed a heterogeneous carbon distribution, further supporting the findings by transmission electron microscopy.
Keywords
Carbide-free bainite, Martensite-austenite constituent, Transmission electron microscopy, Atom probe tomography, Structural modulation, IRON-CARBON MARTENSITE, COMPOSITION PROPERTY APPROACH, SCANNING-ELECTRON-MICROSCOPE, LOW-ALLOY STEEL, SI-C ALLOYS, ATOM-PROBE, RETAINED AUSTENITE, NICKEL-CARBON, CEMENTITE PRECIPITATION, PHASE-TRANSFORMATION

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MLA
Hofer, Christina, et al. “High-Resolution Characterization of the Martensite-Austenite Constituent in a Carbide-Free Bainitic Steel.” MATERIALS CHARACTERIZATION, vol. 144, 2018, pp. 182–90, doi:10.1016/j.matchar.2018.07.011.
APA
Hofer, C., Bliznuk, V., Verdiere, A., Petrov, R., Winkelhofer, F., Clemens, H., & Primig, S. (2018). High-resolution characterization of the martensite-austenite constituent in a carbide-free bainitic steel. MATERIALS CHARACTERIZATION, 144, 182–190. https://doi.org/10.1016/j.matchar.2018.07.011
Chicago author-date
Hofer, Christina, Vitaliy Bliznuk, An Verdiere, Roumen Petrov, Florian Winkelhofer, Helmut Clemens, and Sophie Primig. 2018. “High-Resolution Characterization of the Martensite-Austenite Constituent in a Carbide-Free Bainitic Steel.” MATERIALS CHARACTERIZATION 144: 182–90. https://doi.org/10.1016/j.matchar.2018.07.011.
Chicago author-date (all authors)
Hofer, Christina, Vitaliy Bliznuk, An Verdiere, Roumen Petrov, Florian Winkelhofer, Helmut Clemens, and Sophie Primig. 2018. “High-Resolution Characterization of the Martensite-Austenite Constituent in a Carbide-Free Bainitic Steel.” MATERIALS CHARACTERIZATION 144: 182–190. doi:10.1016/j.matchar.2018.07.011.
Vancouver
1.
Hofer C, Bliznuk V, Verdiere A, Petrov R, Winkelhofer F, Clemens H, et al. High-resolution characterization of the martensite-austenite constituent in a carbide-free bainitic steel. MATERIALS CHARACTERIZATION. 2018;144:182–90.
IEEE
[1]
C. Hofer et al., “High-resolution characterization of the martensite-austenite constituent in a carbide-free bainitic steel,” MATERIALS CHARACTERIZATION, vol. 144, pp. 182–190, 2018.
@article{8620182,
  abstract     = {{The multiphase microstructure of carbide-free bainitic steels comprises bainitic ferrite laths, retained austenite with different morphologies, a minor fraction of carbides and so-called martensite-austenite areas, which partially transform during the last cooling step. While the other constituent received much attention, little is known about the structure of the martensite-austenite constituent in carbide-free bainitic steels. Thus, in this study, it was structurally and chemically investigated by high-resolution techniques such as transmission electron microscopy and atom probe tomography after preceded unambiguous identification by electron backscatter diffraction in conventional as well as transmission mode. The results, ranging from carbon segregation to cementite precipitation in the martensitic part, indicate strong auto-tempering during final cooling which is followed by aging. Also, some kind of structural modulation in the austenite belonging to the martensite-austenite areas was observed. Atom probe tomography revealed a heterogeneous carbon distribution, further supporting the findings by transmission electron microscopy.}},
  author       = {{Hofer, Christina and Bliznuk, Vitaliy and Verdiere, An and Petrov, Roumen and Winkelhofer, Florian and Clemens, Helmut and Primig, Sophie}},
  issn         = {{1044-5803}},
  journal      = {{MATERIALS CHARACTERIZATION}},
  keywords     = {{Carbide-free bainite,Martensite-austenite constituent,Transmission electron microscopy,Atom probe tomography,Structural modulation,IRON-CARBON MARTENSITE,COMPOSITION PROPERTY APPROACH,SCANNING-ELECTRON-MICROSCOPE,LOW-ALLOY STEEL,SI-C ALLOYS,ATOM-PROBE,RETAINED AUSTENITE,NICKEL-CARBON,CEMENTITE PRECIPITATION,PHASE-TRANSFORMATION}},
  language     = {{eng}},
  pages        = {{182--190}},
  title        = {{High-resolution characterization of the martensite-austenite constituent in a carbide-free bainitic steel}},
  url          = {{http://doi.org/10.1016/j.matchar.2018.07.011}},
  volume       = {{144}},
  year         = {{2018}},
}
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