Per: CLARISSE DA COSTA RUFINO (INSTITUTO MILITAR DE ENGENHARIA), IASMIN CAMARGO MATHIAS (INSTITUTO MILITAR DE ENGENHARIA), TALITA GAMA DE SOUSA (INSTITUTO MILITAR DE ENGENHARIA), LUIZ PAULO MENDONÇA BRANDÃO (INSTITUTO MILITAR DE ENGENHARIA)
Abstract:
The development of microstructural analysis methods, mainly non-destructive ones, for the evaluation of mechanical, physical and chemical properties becomes fundamental as the demand for new materials grows. The aim of this work is to correlate the microstructural evolution with the electrical conductivity of interstitial free steel (IF) samples during recovery, partial to complete recrystallization, until grain growth. For this, previously developed software was used, which, by means of data acquisition and processing using a four-point probe, relates the electrical conductivity and the microstructure of the material. In order to verify the efficiency of the software, the preparation, metallographic analysis, and measurement of the electrical conductivity of five IF steel samples with different manufacturing procedures were performed: one sample 85% rolled (AL) and four samples heat treated at 950 °C with duration times of 150 seconds, 10, 30, and 60 minutes. The results obtained with the optical microscope revealed microstructures with deformed grains for the rolled sample, and for the samples submitted to heat treatment, they revealed equiaxial grains. The analysis of the conductivity of the samples made by the software confirmed that these values are as expected, showing its effectiveness.
