Abstract
It is advantageous to use NDE methods to assess the mechanical properties of materials since the conventional method is time-consuming and sometimes requires cutting of sample from the component. The NDE parameters such as ultrasonic velocity and attenuation. electric resistivity, and magnetic coercive force and remanance have been utilized to evaluate changes of material properties due to heat treatment condition. It has been found that changes of materials properties under quenched and tempered/PWHT treatments could not be detected using EMAT and Electrical resistivity methods. However. vickers hardness and magnetic hysteresis loop decreased with heat treatment procedures. These results were obtained using 3Cr-1Mo-0.25V steel. The magnetic parameters were found to be most sensitive to changes of material properties.
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