Determination of Stress-Strain Curve of Dual Phase Steel by Nanoindentation Technique

Abstract:

The advanced high strength (AHS) steels, for example, dual phase (DP) steels, transformation induced plasticity (TRIP) steels and complex (CP) steels principally exhibit multiphase microstructure features. Thus, mechanical behavior of the constituent phases significantly affects the resulting overall properties of such AHS steels. Novel material characterization techniques on micro- and nano-scale have become greatly more important. In this work, stress-strain response of the DP steel grade 1000 was determined by using the Nanoindentation testing. The DP steel showed the microstructure containing finely distributed martensite islands of about 50% phase fraction in the ferritic matrix. The nano-hardness measurements were firstly performed on each individual phase of the examined steel. In parallel, finite element (FE) simulations of the corresponding nano-indentation tests were carried out. Flow curves of the single ferritic and martensitic phases were defined according to a dislocation based theory. Afterwards, the load and penetration depth curves resulted from the experiments and simulations were compared. By this manner, the proper stress-strain responses of both phases were identified and verified. Finally, the effective stress-strain curve of the investigated DP steel could be determined by using 2D representative volume element (RVE) model.

• Periodical: Key Engineering Materials (Volume 658)
• Pages: 195-201
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.658.195
• Online since: July 2015
• Authors: Suttirat Punyamueang*, Viton Uthaisangsuk
• Keywords: Dual Phase Steel, Nanoindentation Test, Stress-Strain Curve

References

[1] A.P. Pierman, O. Bouaziz , T. Pardoen , P.J. Jacques, L. Brassart, The influence of microstructure and composition on the plastic behaviour of dual-phase steels, Acta Materialia 73 (2014) 298-311.

DOI: 10.1016/j.actamat.2014.04.015

[2] M. Lichinchi, C. Lenardi, J. Haupt, R. Vitali, Simulation of Berkovich nanoindentation experiments on thin films using finite element method, Thin Solid Films 312 (1998) 240-248.

DOI: 10.1016/s0040-6090(97)00739-6

[3] V.H. Baltazar, S.K. Panda, M.L. Kuntz, Y. Zhou, Nanoindentation and microstructure analysis of resistance spot welded dual phase steel, Mater. Letters 64 (2010) 207-210.

DOI: 10.1016/j.matlet.2009.10.040

[4] M.D. Taylor, K.S. Choi, X. Sun, D.K. Matlock, C.E. Packard, L. Xu, F. Barlat, Correlations between nanoindentation hardness and macroscopic mechanical properties in DP980 steel.

DOI: 10.1016/j.msea.2013.12.084

[5] R.M. Rodriguez, I. Gutierrez, Unified formulation to predict the tensile curves of steels with different microstructures, Mater. Sci. Forum 426–-432 (2003) 4525-4530.

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

[6] T. Sirinakorn, S. Wongwises, V. Uthaisangsuk, A study of local deformation and damage of dual phase steel, Mater. Design 64 (2014) 729-742.

DOI: 10.1016/j.matdes.2014.08.009

[7] J. Lemaitre, J.L. Chaboche, Mechanics of Solid Materials, Cambridge University Press, (1990).

[8] M.Y. Seok, Y.J. Kim, I.C. Choi, Y. Zhao, J.I. Jang , Predicting flow curves of two-phase steels from spherical nanoindentation data of constituent phases: Isostrain method vs. non-isostrain method , Int. J. Plast. 59 (2014) 108-118.

DOI: 10.1016/j.ijplas.2014.03.013