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Article

Influence of Quenching and Partitioning Parameters on Phase Transformations and Mechanical Properties of Medium Manganese Steel for Press-Hardening Application

Steel Institute, RWTH Aachen University, 52072 Aachen, Germany
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Academic Editor: Mohamed Soliman
Metals 2021, 11(11), 1879; https://doi.org/10.3390/met11111879
Received: 4 November 2021 / Revised: 17 November 2021 / Accepted: 19 November 2021 / Published: 22 November 2021
(This article belongs to the Special Issue Alloy and Process Design of Metallic Materials)
It has been proven that through targeted quenching and partitioning (Q & P), medium manganese steels can exhibit excellent mechanical properties combining very high strength and ductility. In order to apply the potential of these steels in industrial press hardening and to avoid high scrap rates, it is of utmost importance to determine a robust process window for Q & P. Hence, an intensive study of dilatometry experiments was carried out to identify the influence of quenching temperature (TQ) and partitioning time (tp) on phase transformations, phase stabilities, and the mechanical properties of a lean medium manganese steel. For this purpose, additional scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and energy dispersive X-ray spectroscopy (EDX) examinations as well as tensile testing were performed. Based on the dilatometry data, an adjustment of the Koistinen–Marburger (K-M) equation for medium manganese steel was developed. The results show that a retained austenite content of 12–21% in combination with a low-phase fraction of untempered secondary martensite (max. 20%) leads to excellent mechanical properties with a tensile strength higher than 1500 MPa and a total elongation of 18%, whereas an exceeding secondary martensite phase fraction results in brittle failure. The optimum retained austenite content was adjusted for TQ between 130 °C and 150 °C by means of an adapted partitioning. View Full-Text
Keywords: medium manganese steel; quenching and partitioning; dilatometry; martensitic phase transformation; press hardening medium manganese steel; quenching and partitioning; dilatometry; martensitic phase transformation; press hardening
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MDPI and ACS Style

Blankart, C.; Wesselmecking, S.; Krupp, U. Influence of Quenching and Partitioning Parameters on Phase Transformations and Mechanical Properties of Medium Manganese Steel for Press-Hardening Application. Metals 2021, 11, 1879. https://doi.org/10.3390/met11111879

AMA Style

Blankart C, Wesselmecking S, Krupp U. Influence of Quenching and Partitioning Parameters on Phase Transformations and Mechanical Properties of Medium Manganese Steel for Press-Hardening Application. Metals. 2021; 11(11):1879. https://doi.org/10.3390/met11111879

Chicago/Turabian Style

Blankart, Charline, Sebastian Wesselmecking, and Ulrich Krupp. 2021. "Influence of Quenching and Partitioning Parameters on Phase Transformations and Mechanical Properties of Medium Manganese Steel for Press-Hardening Application" Metals 11, no. 11: 1879. https://doi.org/10.3390/met11111879

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