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Applying micromagnetic methods for the non-destructive metallurgical characterisation of AISI 4140 steel materials

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Nowadays, the search for more reliable technologies, which promote the improvement of materials manufacturing and quality control, has been a major concern for engineers and researchers. In this work, special attention was given to the development of a non-destructive micromagnetic technique for the microstructural characterisation of high-strength AISI 4140 steels. Since AISI 4140 is a steel with a high degree of toughness and tensile strength, it is often used for machined applications such as gears, bolts and fasteners. Using a combination of magnetic Barkhausen noise and harmonic analysis of the tangential magnetic field, the influence of different amounts of untempered martensite bands on the micromagnetic and mechanical properties of the steel were analysed. The results indicate the great applicability of the micromagnetic methods for materials characterisation and quality control, showing a high correlation with the material's mechanical toughness.
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Document Type: Research Article

Publication date: March 1, 2013

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