INFLUENCE OF HEAT TREATMENT TIME ON THE DETERMINATION OF MAGNETIC NOISE FOR SIGMA PHASE DETECTION IN DUPLEX STAINLESS STEEL SAMPLES OF DIFFERENT THICKNESSES

Abstract

This work is the result of a study on the influence of heat treatment time on duplex stainless steel (AID) samples when subjected to a magnetic interaction generated from the application of sine waves applied to AID samples in natural/without treatment (CR) and heat-treated under specific conditions. The study correlates the analysis of the magnetic noises that were generated in the magnetic reversibility region to the ability to detect the deleterious sigma phase in the material and predicts the best conditions for the application of the wave, such as frequencies and amplitudes to be considered to identify the presence of the deleterious phase in the material.