Magnetostriction varieties and stress relief caused by pulsed magnetic field

Abstract

Magnetostriction is investigated to evaluate the stress relief caused by pulsed magnetic field treatment, because this physical property is closely associated with residual stress. Magnetostriction of different stressed samples is measured in this paper. The stress variations caused by pulsed magnetic treatment are also compared. It is found that magnetostriction variations are closely associated with stress changes. Thermodynamic potential is used to find the relationship between them. Based on several assumptions, we find that the product of magnetostriction amplitude and stress magnitude is nearly a constant during magnetic field treatment, which is valuable for stress relief evaluation and optimizing processing parameters. This conclusion is testified by stress measurements, and the calculated values are in accordance with the experiment results.

Key words： magnetostriction; pulsed magnetic field treatment; stress relief

Acknowledgements

This work was supported by the National Nature Science Foundation of China (Grant No. 50805085). The pulsed magnetic treating apparatus is supported by the foundation of Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, China (No. 2008008).

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