Abstract
The application of an alternating magnetic field (0.54 T) was observed to lead to an improvement in the fatigue endurance and an increase in Vickers microhardness and tensile strength of both EN8 steel and AA2014-T6 alloy. Fractography using scanning electron microscopy showed evidence of more ductile fracture features after treatment in contrast to untreated samples. The results of X-ray diffraction indicated formation of more compressive residual stresses following treatment; while examination by transmission electron microscopy showed evidence of fewer dislocations. In the case of the AA2014-T6 alloy; Guinier-Preston (GP) zones were also generated by the alternating magnetic field. However; the temperature increase during the treatment was too low to explain these observations. The results were attributed to the non-thermal effect of the alternating magnetic field treatment that led to depinning and movement of dislocations and secondary precipitation of copper.
Highlights
Fatigue, alongside corrosion and wear, are the main causes of damage in metallic members and structures [1]
The results showed that, following the treatment, the fatigue life of EN8 steel at a stress level of of 350 MPa improved from 791,990 to 5,364,498 cycles
The effect of residual stresses (RS) on fatigue strength has been discussed by various researchers [27,28,29], who showed that the decrease of tensile RS and the redistribution of RS can be major factors of the fatigue endurance improvement achieved in the study
Summary
Alongside corrosion and wear, are the main causes of damage in metallic members and structures [1]. Fatigue is thought of as an inevitable and irreversible process in metallic components that are subjected to repetitive stresses over time [3,4,5]. These repeated stresses create micro-flaws within the microstructure leading to fatigue damage. Reducing the magnitude of the induced stress can be achieved by increasing the size of the structural component. This can lead to high production and operational costs as well as a weight penalty. In the case of a vehicle, for example, this can lead to higher fuel consumption and further greenhouse emissions
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