Hot Stamping of Heavy-Gaged - Full Development and the Effect of Press Hardening Process on the Microstructure and Mechanical Properties of 22MnB5 + NbMo Alloyed

Abstract:

For saving mass, to improve the payloads and the durability of commercial vehicles, it is necessary to increase the thickness range of PHS - Press Hardening Steel, replacing low strength steel grades on structural and saving parts. This work presents the industrial development of Heavy-Gaged PHS-Press hardening Steel (4-8mm) starting from the alloy design concept, especially adding niobium to promote a fine and homogeneous microstructure. The development included hot forming simulations, in order to achieve martensitic microstructure through the thickness, correlating with cooling rates and mechanical characteristics, after quenching, as well as welding qualification and fatigue evaluation. Furthermore, were presented the characterization of 22MnB5(Nb+Mo) steel after industrial hot stamping that were evaluated mechanical properties, using the Vickers 10Kgf and the relationship between the microstructure and the thermodynamic aspects.

• Periodical: Materials Science Forum (Volume 1105)
• Pages: 81-86
• DOI: https://doi.org/10.4028/p-lVDq7r
• Online since: November 2023
• Authors: Vagner Braga, Ed Juarez Mendes Taiss*, Diego Tolotti de Almeida, André Luiz Vasconcellos da Costa e Silva
• Keywords: 22MnB5, Heavy-Gaged, NbMo, PHS

References

[1] Jaakko Hannula;et.al.-Evaluation of Mechanical Properties and Microstructures of Molybdenum and Niobium Microalloyed Thermomechanically Rolled High-Strength Press Hardening Steel.

DOI: 10.1007/s11837-019-03478-9

[2] Almeida, D.T.; Souza, J.H.C.; Drunn, J. Experimental investigation of the cooling rate in press hardening process in sheet thick steel 22MnB5. Tecnol. Metal. Mater. Miner., São Paulo.

[3] Hot stamping of heavy-gaged components Hardy Mohrbacher, NiobelCon bvba, João Henrique Souza and Diego Tolotti a Bruning Tecnometal Ltda. - Materials in CarBody, 2019 – Germany.

[4] Material development and qualification of manufacturing technology for hot stamping of heavy gage components. Hardy Mohrbacher, Diego Tolotti de Almeida and João Henrique Corrêa.

[5] Microstructural analysis of 22MnB5+NbMo after different heat treatments. Rauber, J.; et. al.; XXII CONEMI–International Congress of Mechanical and Industrial Engineering, São Paulo, 2022.

[6] De Almeida, D.T.; et. al.;The effect of laser welding on microstructure and mechanical properties in heavy-gage press hardening steel alloys. Materials Science & Engineering, 2021.

DOI: 10.1016/j.msea.2021.141341

[7] Project Develpoment CBMM and Bruning Tecnometal - Development of Industrial Production for Structural Parts of Commercial Vehicles Using Press Hardening Steel.