铁磁材料的动态磁致应变

Dynamic magnetostrictive behavior of ferromagnetic metal

针对磁处理用于降低材料残余应力时效果不稳定的问题,研究了磁处理参数的影响。通过实时测量磁处理过程中磁致应变的方法,研究了磁场磁通势、磁场变化频率和占空比对铁磁材料磁致应变的影响。结果发现,磁通势从0增大到40kA,铁磁材料的磁致应变增加,当大于40kA时,磁致应变趋于饱和,随着磁场变化频率和占空比的降低,铁磁材料的磁致应变增加,原因可以用磁场上升和下降的时间充裕来解释。该文的研究为选择和优化磁处理参数奠定了基础。

Concerning the unstable performance of the magnetic field treatment to relieve material residual stress, this paper investigated the effects of parameters in magnetic field treatment. Magnetostrictive strain in 45# steel, caused by the magnetometive force, the magnetic field frequency and the duty cycle of the field, was measured. Results show that, the magnetostrictive strain increases when magnetometive force increases from 0 to 40 kA. As it exceeds 40 kA, the magnetostrictive strain tends to be stable. The magnetostrictive strain also increases when the frequency or the duty cycle of magnetic field decreases. Sufficient time for the increase and decrease of magnetic field accounts for experimental phenomena. These results can be used to optimize the magnetic treatment parameters.