Abstract

CUERVO-BASURTO, A.; NARVAEZ-TOVAR, C. A.  and  RODRIGUEZ-BARACALDO, R.. Assessment of microindentation method in the characterization of DP600 response using phases distribution and a specific shape parameter along RVEs and FEM simulation approaches. J. appl. res. technol [online]. 2022, vol.20, n.6, pp.686-702.  Epub May 08, 2023. ISSN 2448-6736.  https://doi.org/10.22201/icat.24486736e.2022.20.6.1121.

This work proposes a simulation approach to evaluate the effect of hard particles on the load curve of Dual-Phase Steel (DP600) subjected to microindentation tests. Axisymmetric and three-dimensional Representative Volume Elements were generated using statistical data from metallographic images. Finite Element Method simulations of the microindentation tests used the Gurson model. A new variable, called the spherical radius shape variable, was proposed to quantify the closeness of the hard particles to the indenter tip. The simulated indentation curves were compared with an experimental curve of DP600, obtaining relative errors lower than 20 percent. Nodal true stress-strain curves were obtained and compared with experimental true stress-strain curves, achieving relative errors below 1 percent. Results show that the hard particles near the indenter affect the stress and strain values and microvoid fields by changing the indentation response behavior. Hardness and nodal true stress-strain curves are insensitive to the spherical radius variable. The spherical radius shape variable indicates an effect of the hard particles on the indentation curve response. When its spherical radius value is low, the relative error of the average indentation curve decreases since the hard particles are constraining the deformation caused by the indenter in the material.

Keywords : Microindentation; micro-macro modeling; dual-phase steel; ferrite; martensite.

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