Combination of International High Pressure Forming and Q-P Process for Production of Hollow Products from Ahs Steel

Abstract:

All sectors of industry experience high demand for shaped products with as good mechanical properties as possible at low costs. Automotive industry, in addition, requires that the parts are of lightweight construction. Consequently, new types of materials and processes have to be combined to design new production chains capable to meet this demand. For instance, there are high-strength low-alloyed steels, whose final properties are attained by advanced heat treating techniques. One of such techniques is the Q&P process which can deliver excellent ultimate strengths exceeding 2000 MPa at a sufficient elongation level of 10 %. When combined with an unconventional forming method, it allows complex-shaped parts with outstanding mechanical properties to be made. One example of such combined procedure is the sequence of internal high pressure forming, hot stamping and Q&P processing. In the present study, thin-walled hollow stock was processed using such a combined procedure. After stepwise optimization of processing parameters, products with martensitic structure and a small amount of bainite were obtained. In all locations of the product which were tested, the ultimate strength exceeded 1950 MPa and elongation reached 15 %

• Periodical: Advanced Materials Research (Volume 1127)
• Pages: 9-15
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1127.9
• Online since: October 2015
• Authors: Bohuslav Mašek, Ivan Vorel, Hana Jirková, Petr Kurka*
• Keywords: Hot Stamping, Internal High Pressure Forming, Q&P Process

References

[1] KUČEROVÁ, L. et al. Comparison of Microstructures and Properties Obtained After Different Heat Treatment Strategies of High Strength Low Alloyed Steel. Journal of Iron and Steel Research International, 2011, vol. 18, s. 427-431.

[2] SPEER, J. et al. Carbon Partitioning into Austenite after Martensite Transformation. Acta Materialia, May 2003, vol. 51, s. 2611-2622.

DOI: 10.1016/s1359-6454(03)00059-4

[3] SPEER, J. et al. The Quenching and Partitioning, Process: Background and Recent PRogress. Materials Research, 2005, vol. 8 (4), s. 417-423.

[4] TSUCHIYMA, T. et al. Quenching and Partitioning treatment of a low-carbon martensitic stainless steel. Materials Science and Engineering A, January 2012, vol. 532, s. 585-592.

DOI: 10.1016/j.msea.2011.10.125

[5] JIRKOVÁ, H., KUČEROVÁ, L., MAŠEK, B. Effect of Quenching and Partitioning Temperatures in the Q-P Process on the Properties of AHSS with Various Amounts of Manganese and Cilicon. Materials Science Forum, January 2012, vols. 706-709, s. 2734-2739.

DOI: 10.4028/www.scientific.net/msf.706-709.2734

[6] KUČEROVÁ, L. et all. Optimization of Q-P Process Parameters with Regard to Final Microstrucutres and PRoperties. Annals of DAAAM For 2009 & Proceedings of the 20th International DAAAM Symposium, 2009, vol. 20, s. 1035-1036.

[7] Daniela, H; Zbysek, N.; Petr, M.; Jan, D.: Q-P Process Optimization With the Use of Quenching Dilatometer, HSLA steels 2011, 31. 5 – 2. 6. 2011, Beijing , China, Journal of Iron and Steel Research (International), Issue S!, pp.417-421.

[8] MAŠEK, B. et al. Improvement of Mechanical Properties of automotive Components Using Hot Stamping with Integrated Q-P Process. Journal of Iron and Steel Research International, May 2011, vol. 18 (1-2), s. 730-734.

[9] DŽUGAN, J., NOVÝ, Z., SOSNOVÁ, M.: Fatigue life optimization of steel by thermomechanical treatment with the use of physical simulator, Advanced Materials Research Vols. 264-265 (2011) pp.1725-1730.

DOI: 10.4028/www.scientific.net/amr.264-265.1725

[10] Jan, D; Zbysek, N; Petr, M; Jana, M; Petr, M: Mechanical Properties Optimization Metal Bars and Sheets Made of 34CrNiMo6 Steel, HSLA steels 2011, 31. 5 – 2. 6. 2011, Beijing , China, Journal of Iron and Steel Research (International), Issue S!, pp.417-421.