Abstract
This work studies the application of a Non-Destructive Inspection Technique (NDIT), based on the Magnetic Barkhausen Noise (MBN), for the detection of non-homogeneous regions in carbon steel plates. It presents the advances in the development of a variant of a new non-destructive magnetic test technique, called Continuous Scanning Magnetic Barkhausen Noise (CSMBN). The non-homogeneous or damaged regions were produced by plastic deformations in rolled and annealed sheets of SAE 1060 and 1070 steels. MBN is generated by abrupt changes in the magnetization of materials when subjected to alteration. The sensitivity of the MBN signals in the detection of plastic deformations was analyzed varying parameters such as excitation magnetic field frequency and the speed of movement of the probe. The behavior of the root mean square of magnetic Barkhausen Noise signal (RMSMBN) parameter was correlated with the position of the nonhomogeneous regions detected in the samples. An evaluation of the technique applied to the measurement was made, comparing the results obtained with the Static Magnetic Barkhausen Noise (SMBN) technique, which is a method already established in the literature. The results showed that in all cases studied it was possible to detect the position of the damage, due to variation of the magnetic field. These changes are affected by the presence and distribution of elastic stresses (compression and traction), plastic deformation and microstructure modification. The results of CSMBN were similar to the SBMN with the advantage of being a continuous and more productive procedure. This new technique increases the spectrum of NDIT solutions for problems not contemplated by existing techniques.
Highlights
The design of mechanical and structural components in engineering is limited by the mechanical properties of the materials as well as by the methods used in their manufacture
The results show that the evolution of the RMSMBN parameter obtained with the Static Magnetic Barkhausen Noise (SMBN) technique was similar to behavior of RMSMBN parameter obtained with Continuous Scanning Magnetic Barkhausen Noise (CSMBN) inspection
It can be verified that the RMSMBN parameter profile shows how the Barkhausen signal decreases with the localized plastic deformation, which is a typical response in SMBN measurements
Summary
The design of mechanical and structural components in engineering is limited by the mechanical properties of the materials as well as by the methods used in their manufacture. Once in service the components will undergo thermo-chemical processes that changes their characteristics and affect the projected life. In this context, the use of Non-destructive Testing (NDT) methods plays an important role on the evaluation of damage that affect the life of the component. For more than 14 years, the Dynamics and Instrumentation Laboratory (LADIN) of the University of São Paulo has developed proprietary NDIT technology based on MBN. This development covers the manufacture of equipment, software and technological applications
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