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Open AccessArticle

Investigation of the Microstructural Evolution during Hot Stamping of a Carburized Complex Phase Steel by Laser-Ultrasonics

Institute of Manufacturing Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
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Academic Editor: Sang-Kon Lee
Materials 2021, 14(8), 1836; https://doi.org/10.3390/ma14081836
Received: 16 March 2021 / Revised: 1 April 2021 / Accepted: 6 April 2021 / Published: 7 April 2021
(This article belongs to the Collection Metal Forming: Fundamentals, Simulation and Applications)
Prior carburization of semi-finished steel sheets is a new process variant in hot stamping to manufacture parts with tailored properties. Compared to conventional hot stamping processes, a complex phase typed steel alloy is used instead of 22MnB5. Yet recent investigations focused on final mechanical properties rather than microstructural mechanisms cause an increase in strength. Thus, the influence of additional carburization on the microstructural evolution during hot stamping of a complex phase steel CP-W®800 is investigated within this work. The phase transformation behavior, as well as the grain growth during austenitization, is evaluated by in-situ measurements employing a laser-ultrasound sensor. The results are correlated with additional hardness measurements in as-quenched condition and supplementary micrographs. The experiments reveal that the carburization process significantly improves the hardenability of the CP-W®800. However, even at quenching rates of 70 K/s no fully martensitic microstructure was achievable. Still, the resulting hardness of the carburized samples might exceed the fully martensitic hardness of 22MnB5 derived from literature. Furthermore, the carburization process has no adverse effect on the fine grain stability of the complex phase steel. This makes it more robust in terms of grain size than the conventional hot stamping steel 22MnB5. View Full-Text
Keywords: hot stamping; phase transformation; quenching; grain growth; carburization hot stamping; phase transformation; quenching; grain growth; carburization
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MDPI and ACS Style

Horn, A.; Merklein, M. Investigation of the Microstructural Evolution during Hot Stamping of a Carburized Complex Phase Steel by Laser-Ultrasonics. Materials 2021, 14, 1836. https://doi.org/10.3390/ma14081836

AMA Style

Horn A, Merklein M. Investigation of the Microstructural Evolution during Hot Stamping of a Carburized Complex Phase Steel by Laser-Ultrasonics. Materials. 2021; 14(8):1836. https://doi.org/10.3390/ma14081836

Chicago/Turabian Style

Horn, Alexander; Merklein, Marion. 2021. "Investigation of the Microstructural Evolution during Hot Stamping of a Carburized Complex Phase Steel by Laser-Ultrasonics" Materials 14, no. 8: 1836. https://doi.org/10.3390/ma14081836

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