Abstract

ARIZA, Edwan A; MARTORANO, Marcelo A  and  TSCHIPTSCHIN, André P. Residual stresses generated during hardening of medium carbon steel bar, finite element simulation and experimental verification. Rev. LatinAm. Metal. Mater. [online]. 2015, vol.35, n.1, pp.55-64. ISSN 0255-6952.

The aim of this work is to analyze the distribution of residual stresses resulting from combination of volumetric changes due to heat gradients and phase changes occurring during the quenching process of 4340 steel cylinder. The mathematical model used for this objective uses the AC3 program for modeling thermal treatments which provides transformation curves, cooling curves, microstructure and material hardness in 20 positions between the surface and the center of the cylinder, whose results were fed into a finite element model, considering thermal-mechanical coupling and non-linear elastic-plastic behavior. The values of the physical and mechanical properties required in the model, were included taking into account the temperature dependence and the phases present, depending on the treatment time. The results of the modeling have been compared to experimental measurements of the residual stresses at the surface, through X-Ray diffraction techniques and using the sin²ψ method. The results obtained from the numerical model showed a significant correspondence in comparison with the experimental results and indicates that the most significant stresses are tangential.

Keywords : Quenching; Finite Element Method; Residual Stresses.

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