Manufacturing Technology 2023, 23(3):269-275 | DOI: 10.21062/mft.2023.030

Effect of Temperature and Deformation on the Stability of Retained Austenite in Closed-die Forgings from High-strength Martensitic Manganese-silicon Steels

Dagmar Bublíková ORCID..., Hana Jirková ORCID..., Adam Stehlík, ©těpán Jeníček ORCID...
University of West Bohemia, RTI-Regional Technological Institute, Univerzitní 22, CZ – 306 14 Pilsen, Czech Republic

In advanced steels, retained austenite is an important phase in the final microstructure, which provides a favourable combination of strength and ductility. Advanced methods capable of achieving this include the Q-P process (Quenching and Partitioning). By this means, strength of around 2000 MPa and elongation of 10-15 % can be obtained. The main factors that determine whether retained austenite remains stable in the mar-tensitic matrix include its morphology, particle size and distribution. A closed-die forging was made from an experimental steel containing 0.42 % C, 2.45 % Mn, 2.09 % Si, 1.34 % Cr and 0.56 % Ni and Q-P processed. Based on previous data measured in a real-world process, two basic heat treatment sequences were created and tested on a thermomechanical simulator. The two sequences differed in the cooling rates. Upon heat treatment, a martensitic microstructure with a retained austenite content of 13-17 % was obtained. The ul-timate strength was in the range of 2100-2200 MPa with elongations A5mm 8-15 %. Austenite stability was tested by bringing the material to various temperatures (200, 300, 400, -18, -196 °C) and by cold forming at various strain rates (10-3, 10-1, 10 s-1). The volume fraction of carbon in austenite was calculated from the lattice parameters determined by X-ray diffraction.

Keywords: Q-P process, Retained austenite, AHSS steels, X-ray diffraction, Thermomechanical simulator
Grants and funding:

This paper includes results achieved within the project SGS-2021-025. Electron beam application for welding advanced high strength steels. The project is subsidised from specific resources of the state budget for research and development

Received: December 7, 2022; Revised: March 7, 2023; Accepted: April 20, 2023; Prepublished online: May 5, 2023; Published: July 5, 2023  Show citation

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Bublíková D, Jirková H, Stehlík A, Jeníček ©. Effect of Temperature and Deformation on the Stability of Retained Austenite in Closed-die Forgings from High-strength Martensitic Manganese-silicon Steels. Manufacturing Technology. 2023;23(3):269-275. doi: 10.21062/mft.2023.030.
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