Detection of microstructural changes is ag reat importance matter in production line of steel parts. To implement such a task,many destructive tests are involved ini ndustries. Current work examines the effects of different microstructures and mechanical properties on the magnetic Bark hausennoise techniqueas as uitable alternative testing method.Inthisstudy,different dual-phases teels with different martensite percentages were manufactured using various intercritical annealing temperatures from 750 to 850 C. The results concerning magnetic Barkhausen noise were discussed in terms of position, height ands hape of Barkhausen noise profiles, taking into account the effect of different percentages of martensite. Since this method is nondestructive after calibration, some beneficial relations for nondestructive characterization of microstructure as well as mechanical properties of any unknown dual-phase steel sample were achieved. Additionally,the feasibility of using the magnetic Barkhausen noise to detect microstructural changes during tempering of dual-phase steels was evaluated.The resultsr evealed this magnetic method had a high potential to be used as a reliable nondestructive tool to detect microstructural changes occurring during manufacturing of dual-phase steels. &

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