’Quenching and Partitioning’ - An In Situ Approach to Characterize the Process Kinetics and the Final Microstructure of TRIP-Assisted Steel

Thomas Rieger; Klaus Herrmann; Dagmar Carmele; Stephan Meyer; Thomas Lippmann; Andreas Stark; Wolfgang Bleck; Uwe Klemradt

doi:10.4028/www.scientific.net/AMR.409.713

Paper Titles

Precipitation of Si and its Influence on Mechanical Properties of Type 441 Stainless Steel
p.690

Effects of Hot-Forging Process on Combination of Strength and Toughness in Ultra High-Strength TRIP-Aided Martensitic Steels
p.696

Carbon Distribution and the Influence on the Tempering Behaviour in a Hot-Work Tool Steel Aisi H11
p.702

Systematic Approach to Clarify the Mechanism of Dynamic Transformation in Fe-6Ni-0.1C Alloy
p.707

’Quenching and Partitioning’ - An In Situ Approach to Characterize the Process Kinetics and the Final Microstructure of TRIP-Assisted Steel
p.713

Evolution of Microstructure and Mechanical Properties during Annealing of Cold Rolled Fe-24Mn-3Al-2Si-1Ni-0.06C Twip Steel
p.719

Topological Analysis of Martensite Morphology in Dual-Phase Steels
p.725

Structural Changes in a 304-Type Austenitic Stainless Steel Processed by Multiple Hot Rolling
p.730

Bubble Structures, Fishscaling Resistance and Adhesion of Vitreous Enamel to Low Carbon Steel
p.736

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 409’Quenching and Partitioning’ - An In Situ Approach...

’Quenching and Partitioning’ - An In Situ Approach to Characterize the Process Kinetics and the Final Microstructure of TRIP-Assisted Steel

Abstract:

The ‘Quenching and Partitioning’ (Q&P) concept aims to increase the strength level of conventional TRIP-assisted advanced high strength steel (AHSS) by replacing ferritic constituents by tempered martensite. The Q&P heat treatment process involves austenitization and interrupted quenching followed by carbon partitioning from martensite to austenite at elevated temperatures. The final microstructure is traditionally investigated at room temperature after metallographic preparation by microscopy and x-ray analysis with laboratory tubes. Besides other disadvantages the established characterization methods are not adequate to observe the development of the microstructure during Q&P treatment. In the present work the microstructural evolution during Q&P processing was monitored by in-situ diffraction experiments using very hard (100 keV) synchrotron x-ray radiation. Debye-Scherrer rings were recorded as a function of time and temperature during the heat treatment in a state-of-the-art dilatometer (type Bähr DIL805AD) at the Engineering Materials Science beamline HARWI-II (HZG outstation at Deutsches Elektronensynchrotron (DESY), Hamburg). The diffraction patterns contain quantitative information on the phases present in the sample (for more details cf. Abstract Carmele et al, this conference). The evolution of the austenite phase fraction during the partitioning treatment at the quench temperature (1-step Q&P) is discussed exemplarily for a Si-based TRIP steel with additions of Ni.

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Periodical:

Advanced Materials Research (Volume 409)

Pages:

713-718

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.409.713

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Online since:

November 2011

Authors:

Thomas Rieger, Klaus Herrmann, Dagmar Carmele, Stephan Meyer, Thomas Lippmann, Andreas Stark, Wolfgang Bleck, Uwe Klemradt

Keywords:

Isothermal Transformation, Martensitic Transformation (MT), Microstructure, Partitioning, Quenching, Retained Austenite

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References

[1] J. Speer, D.K. Matlock, B.C. DeCooman, J.G. Schroth, Acta Mat., Vol. 51 (2003), p.2611.

Google Scholar

[2] M.J. Santofimia, L. Zhao, J. Sietsma, Met. Mat. Trans. A, Vol. 40A (2009), p.46.

Google Scholar

[3] D.V. Edmonds, D.K. Matlock, J. Speer, in: Proc. Int. Conf. Advanced Steels 2010, edited by Y. Weng, H. Dong, Y. Gan, Metallurgical Industry Press, Beijing (2010), p.229.

Google Scholar

[4] L. Wang, W. Feng, in: Proc. Int. Conf. Advanced Steels 2010, edited by Y. Weng, H. Dong, Y. Gan, Metallurgical Industry Press, Beijing (2010), p.242.

Google Scholar

[5] S. Melzer, J. Moermann, in: Microstructure and Texture in Steels and Other Materials, editied by A. Haldar, S. Suwas, D. Bhattacharjee, Springer, London (2009).

Google Scholar

[6] J. Angeli, E. Fuereder, M. Panholzer, A.C. Kneissl: Prakt. Metallographie, Vol. 43, No. 10, (2006), p.489.

Google Scholar

[7] L. Zhao, N.H. van Dick, E. Brueck, J. Sietsma, S. van der Zwaag: Mat. Sc. Eng. A, Vol. 313 (2001), p.145.

Google Scholar

[8] prEN 10338: 2010: Hot rolled and cold rolled non-coated products of multiphase steels for cold forming - Technical delivery conditions.

DOI: 10.3403/30280399u

Google Scholar

[9] B.D. Cullity: Elements of X-ray diffraction (Addison-Wesley 1967).

Google Scholar