Influence of the Processing Variables on the Microstructure Evolution of a Bainitic Carbide-Free Steel

M.C. Taboada; I. Gutiérrez; D. Jorge-Badiola; S.M.C. van Bohemen; F. Hisker; Georg Paul

doi:10.4028/www.scientific.net/MSF.879.867

Paper Titles

Al-5Cu Alloy Processed by Equal-Channel Angular Pressing
p.843

Analysis of Thin Strip Shape and Profile in Cold Rolling: A Way to Improve Strip Profile and Mechanical Properties
p.849

Local Surface Phase Stability during Cyclic Oxidation Process
p.855

Process Parameter Optimization of Fused Deposition Modeling for Helical Surfaces Using Grey Relational Analysis
p.861

Influence of the Processing Variables on the Microstructure Evolution of a Bainitic Carbide-Free Steel
p.867

The Effect of Sample Preparation on the Microstructure of Austenitic-Ferritic Stainless Steel
p.873

Effect of Red Scale on the Bendability of Ultrahigh-Strength Strip Steel
p.879

Effects of Additional Elements on Hydrogen Storage Properties for Vanadium Alloys
p.885

Evaluation of Rolling Contact Fatigue by Using an X-Ray Diffraction Ring Analyzer
p.891

HomeMaterials Science ForumMaterials Science Forum Vol. 879Influence of the Processing Variables on the...

Influence of the Processing Variables on the Microstructure Evolution of a Bainitic Carbide-Free Steel

Abstract:

New trends focused on achieving higher performance steels has led to a so-called 3^rd Generation Advanced High Strength Steels (AHSS), in which the typical polygonal ferrite found in TRIP steels as a matrix phase is replaced by harder phases as Carbide-Free Bainite (CFB) and/or (tempered) martensite. Besides, large volume fractions of retained austenite (R.A.) with adequate stability are aimed for to improve the formability of the steels. Si containing steels are regarded as the most suitable to retard cementite formation and consequently reach high volume fractions of RA. In this work, CFB annealing schedules were applied to dilatometer samples of Fe-0.22C-2.0Mn-1.3Si. The overaging temperature T_B was varied between 390 oC and 480 oC, and other processing variables investigated were the austenitizing temperature T_aus, and the overaging holding time t_B. The annealed samples analyzed with LOM, FEG-SEM, EBSD and X-ray diffraction techniques show that markedly different complex microstructures made up of bainite, ferrite, MA phase and retained austenite (R.A) are accomplished depending on the specific thermal cycle. These results are described in detail and discussed in relation to the dilatometry measurements.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Materials Science Forum (Volume 879)

Pages:

867-872

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.867

Citation:

Cite this paper

Online since:

November 2016

Authors:

M.C. Taboada, I. Gutiérrez, D. Jorge-Badiola*, S.M.C. van Bohemen, F. Hisker, Georg Paul

Keywords:

Bainite, Carbide-Free Steels, Microstructure Characterization

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

* - Corresponding Author

References

[1] N. Fonstein, Advanced High Strength Sheet Steels, first edition, Springer International Publishing Switzerland, (2015).

Google Scholar

[2] M. Azuma, N. Fujita, M. Takahashi, T. Senuma, D. Quidort, T. Lung, Modeling upper and lower bainite transformation in steels, ISIJ Int. 45 (2005) 221-228.

DOI: 10.2355/isijinternational.45.221

Google Scholar

[3] G.I. Rees, H.K.D. H Bhadeshia, Bainite transformation kinetics, part I: Modified model, Mater. Sci. Technol. 8 (1992) 985-993.

DOI: 10.1179/mst.1992.8.11.985

Google Scholar

[4] D. Quidort, Y.J. M Brechet, A model of isothermal and non-isothermal transformation kinetics of bainite in 0. 5%C steels, ISIJ Int. 42(2002) 1010-1017.

DOI: 10.2355/isijinternational.42.1010

Google Scholar

[5] F. G. Caballero, H. Roelofs, St. Hasler, C. Capdevila, J. Chao, J. Cornide, C. Garcia-Mateo, Influence of bainite morphology on impact toughness of continuously cooled cementite free bainitic steels, Mat. Sci. Tech. 28 (2012) 95-102.

DOI: 10.1179/1743284710y.0000000047

Google Scholar

[6] C. Hofer, H. Leitner, F. Winkelhofer, H. Clemens, S. Primig, Structural characterization of carbide-free, bainite in a Fe-0. 2C-1. 5Si-2. 5Mn steel, Mater. Charact. 102 (2015) 85-91.

DOI: 10.1016/j.matchar.2015.02.020

Google Scholar

[7] J. Chiang, J.D. Boyd, A.K. Pilkey, Effect of microstrucutre on retained austenite stability and tensile behaviour in an aluminium-alloyed TRIP steel, Mater. Sci. Eng. A, 638 (2015) 132-142.

DOI: 10.1016/j.msea.2015.03.069

Google Scholar

[8] R. Rodríguez, I. Gutiérrez, Unified Formulation to Predict the Tensile Curves of Steels with Different Microstructures, Mat. Sci. Forum 426-432(2003) 4525-4530.

DOI: 10.4028/www.scientific.net/msf.426-432.4525

Google Scholar

[9] B. Donnay, J.C. Herman, V. Leroy, U. Lotter, R. Grossterlinden, H. Pircher, Microstructure evolution of C-Mn steels in hot deformation process: the STRIPCAM model Proc. 2nd Conf. Model. Met. Roll. Process J.H. Beynon, P. Ingham, H. Teichert, K. Waterson, London, 1996, pp.23-35.

Google Scholar

[10] S.M.C. van Bohemen, Bainite and martensite start-temperature calculated with exponential carbon dependence, Mat. Sci. Technol. 28 (2012) 487-495.

DOI: 10.1179/1743284711y.0000000097

Google Scholar

[11] S.M.C. van Bohemen, The nonlinear lattice expansion of iron alloys in the range 100-1600 K, Scr. Mater. 69 (2013) 315-318.

DOI: 10.1016/j.scriptamat.2013.05.009

Google Scholar

[12] S. Zajac, V. Schwinn, K. -H. Tacke, Characterisation and Quantification of Complex Bainitc Microstructures in High and Ultra-High Strength Linepipe Steels, Mat. Sci. Forum 500-501 (2005) 387-394.

DOI: 10.4028/www.scientific.net/msf.500-501.387

Google Scholar