Abstract
A method for the monitoring of residual stress distribution in steels has been developed based on non-destructive surface magnetic permeability measurements. In order to investigate the potential utilization of the magnetic method in evaluating residual stresses, the magnetic calibration curves of various ferromagnetic alloyed steels’ grade (AISI 4140, TRIP and Duplex) were examined. X-Ray diffraction technique was used for determining surface residual stress values. The overall measurement results have shown that the residual stress determined by the magnetic method was in good agreement with the diffraction results. Further experimental investigations are required to validate the preliminary results and to verify the presence of a unique normalized magnetic stress calibration curve.
Highlights
Mechanical and thermal processes in steels are accompanied by the development of preferred crystallographic texture and orientation of the microstructural phases.[1]
In order to determine the magnetic properties of the examined samples a non-destructive magnetic techniques was selected: the surface magnetic permeability
X-Ray diffraction technique was used for determining surface residual stress values
Summary
Mechanical and thermal processes in steels are accompanied by the development of preferred crystallographic texture and orientation of the microstructural phases.[1] Magnetization involves the nucleation and the motion of magnetic walls and is strongly connected with the changes in microstructure, grain size, stress state and deformation in steels.[2,3,4,5,6] The non-destructive method based on quasi-dc permeability has been examined,[7,8,9,10,11] in order to describe the possibility of applying non-destructive magnetic technique on the study of in steels. The applicability of the examined techniques for the non-destructive characterization of steel degradation was discussed
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