Manufacturing Technology 2020, 20(4):436-441 | DOI: 10.21062/mft.2020.060

Comparison of high strength steels with different aluminium and manganese contents using dilatometry

Jan Hajsman, Ludmila Kucerova, Karolina Burdova

Regional Institute of Technology, Faculty of Mechanical Engineering, University of West Bohemia. Univerzitni 8, 306 14 Plzen. Czech Republic

In this paper, the properties of three low carbon steels containing different percentage of manganese (1.5 or 3 wt%) and aluminium (1.5 or 2 wt %) were tested using dilatometric analysis and metallog-raphy. The steels had chemical compositions typical for TRIP (Transformation induced plasticity) steels and the two steels with an increased manganese content already belonged to the third genera-tion of AHS (advanced high strength) steels. The dilatometric measurement was employed not only to determine the characteristic transformation temperatures but also to simulate the heat treatment procedure commonly used for TRIP steels. Resulting microstructures obtained through this simula-tion were evaluated and compared. The two main alloying elements were proved to have a significant effect on the transition temperatures and thus on the processability and overall resulting properties of the material.

Keywords: Dilatometric Analysis, TRIP steel, Bainitic Steel, CCT Diagram, Transformation Temperature

Grants and funding:

Student grant competition of the University of West Bohemia in Pilsen, SGS 2018-048 Design of heat and thermo-mechanical treatment of high strength steels of the third generation. The project is subsidised from specific re-sources of the state budget for research and development.

Received: April 16, 2020; Revised: August 10, 2020; Accepted: August 11, 2020; Prepublished online: November 23, 2020; Published: December 8, 2020  Show citation