Paper Titles
Experimental Procedure Definition for Evaluating the Formability at Warm Temperatures of AZ31 Magnesium Alloy
p.39
On The Stability of Superplastic Deformation Using Nonlinear Wavelength Analysis
p.47
On the Formability of Magnesium Alloy Sheets in Warm Conditions
p.55
Evaluation of the Annealing Temperature Effect on the Mechanical Properties of a IF Steel by Means of Physical Simulation
p.63
Microstructural Characterization of Thermo-Mechanical Treated TRIP Steels
p.71
Mechanical Properties and Plastic Anisotropy of the Quenchenable High Strength Steel 22MnB5 at Elevated Temperatures
p.79
Improvement of Fatigue Behaviour of High Strength Aluminium Alloys by Fluidized Bed Peening (FBP)
p.87
Determination of Yield Locus of Sheet Metal at Elevated Temperatures: A Novel Concept for Experimental Set-Up
p.97
Detection of the Real Plastification in a Biaxial Tension Test
p.105

Microstructural Characterization of Thermo-Mechanical Treated TRIP Steels

Article Preview

Abstract:

The increasing demand for the reduction of automobiles CO2 emissions for environmental preservation leads the automotive industries towards the mechanical components weight reduction. Sheet steels with multiphase microstructures exhibit favourable combinations of strength and ductility. The so called TRIP steels have a metastable microstructure that consists of a continuous ferrite matrix containing a dispersion of hard second phases martensite and bainite. These steels also contain retained austenite, at room temperature, that represents the source of the TRansformation Induced Plasticity effect. When the material is subjected to deformation step, the retained austenite transforms itself into martensite; the produced martensite delays the onset of necking resulting in a product with high total elongation, excellent formability and high crash energy absorption. In the present research the steel TRIP 800 zinc coated has been subjected to different thermo–mechanical treatments in order to evaluate the relation between microstructure of material and TRIP effects. Whit this aim the microstructural analysis has been performed and the evaluation of content of different phases has been made by means of the image analysis techniques. The relation among the strain level, the content of different phases, the thermal treatments and the work hardening properties of materials have been valued. Furthermore, it has been also highlighted the dependence of the bake hardening properties of material on the different thermo-mechanical treatments.

You might also be interested in these eBooks
Sheet Metal 2007 View Preview

Info:

Periodical:

Key Engineering Materials (Volume 344)

Pages:

71-78

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.344.71

Citation:

Cite this paper

Online since:

July 2007

Authors:

A. Barcellona, L. Cannizzaro, D. Palmeri

Keywords:

Bake Hardening, Multiphase Steel, Retained Austenite, TRIP Effect, Work-Hardening

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2007 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] Ashok Kumar Srivastava a, G. Jha, N. Gope, S.B. Singh: Effect of heat treatment on microstructure and mechanical properties of cold rolled C-Mn-Si TRIP-aided steel, Materials Characterization 57, (2006), 127-135.

DOI: 10.1016/j.matchar.2006.01.010

Google Scholar

[2] X.D. Wang, B.X. Huang, Y.H. Rong, L. Wang : Microstructures and stability of retained austenite in TRIP steels, Materials Science and Engineering A, (2006), article in press.

DOI: 10.1016/j.msea.2006.02.149

Google Scholar

[3] A. Wasilkowska, P. Tsipouridis, E.A. Werner, A. Pichler, S. Traint: Microstructure and tensile behaviour of cold-rolled TRIP-aided steels, Journal of Materials Processing Technology 157-158, (2004), 633-636.

DOI: 10.1016/j.jmatprotec.2004.07.126

Google Scholar

[4] E. Girault, A. Mertens, P. Jacques, Y. Houbaert, B. Verlinden, J. Van Humbeeck: Comparison Of The Effects Of Silicon And Aluminium On The Tensile Behaviour Of Multiphase Trip-Assisted Steels, Scripta mater. 44, (2001), 885-892.

DOI: 10.1016/s1359-6462(00)00697-7

Google Scholar

[5] Huo Yan-Qiu, Long Xiu-Hui, Zhou Zhen-Hua, Li Jian-Guo: Bainite transformation and TRIP effect in 20Mn2SiVB steel, Materials Science and Engineering A, (2006), article in press.

DOI: 10.1016/j.msea.2006.02.148

Google Scholar

[6] Wen Shi, Lin Li, Chun-Xia Yang, Ren-Yu Fu, Li Wang, Partick Wollants: Strain-induced transformation of retained austenite in low-carbon low-silicon TRIP steel containing aluminum and vanadium, Materials Science and Engineering A, 429, (2006).

DOI: 10.1016/j.msea.2006.05.069

Google Scholar

[7] S. Oliver, T.B. Jones, G. Fourlaris: Dual phase versus TRIP strip steels: Microstructural changes as a consequence of quasi-static and dynamic tensile testing, Materials Characterization, (2006), article in press.

DOI: 10.1016/j.matchar.2006.07.004

Google Scholar

[8] J. Bouquerel, K. Verbeken, B.C. De Cooman: Microstructure-based model for the static mechanical behaviour of multiphase steels, Acta Materialia, 54, (2006), 1443-1456.

DOI: 10.1016/j.actamat.2006.04.001

Google Scholar

[9] Z.C. Wang, S.J. Kim, C.G. Lee, T.H. Lee: Bake-hardening behavior of cold-rolled CMnSi and CMnSiCu TRIP-aided steel sheets, Journal of Materials Processing Technology, 151, (2004), 141- 145.

DOI: 10.1016/j.jmatprotec.2004.04.029

Google Scholar

[10] S. Zaefferer, J. Ohlert, W. Bleck: A study of microstructure, transformation mechanisms and correlation between microstructure and mechanical properties of a low alloyed TRIP steel, Acta Materialia, 52, (2004), 2765-2778.

DOI: 10.1016/j.actamat.2004.02.044

Google Scholar

[11] B.C. De Cooman: Structure-properties relationship in TRIP steels containing carbide-free bainite, Current Opinion in Solid State and Materials Science, 8, (2004), 285-303.

DOI: 10.1016/j.cossms.2004.10.002

Google Scholar