钢铁材料中残余应力与磁致振动的相互作用关系

研究了45钢脉冲磁处理过程中残余拉应力与磁致振动之间的相互作用关系.结果表明,残余应力可影响材料的磁致伸缩特性,进而影响材料的磁致振动特性.钢铁材料中存在残余应力时,磁致振动的平衡位置发生移动,且振幅减小;随着磁致振动过程的进行,有残余应力试样的磁致振动特性逐渐向无应力试样的特性过渡.另外,残余应力在磁致振动结束后发生了一定程度的下降,这表明脉冲磁处理过程中,残余应力与磁致振动之间存在着强烈的耦合作用,使得带有残余应力材料的磁致振动表现出强烈的非线性特征.

STUDY ON THE RELATIONSHIP BETWEEN MAGNETIC FIELD AND RESIDUAL STRESS IN STEEL MATERIALS

It has been reported that magneto-vibration is a key factor to cause residual stress reduction in steel during the process of magnetic treatment. In this paper the relationship between magneto-vibration and residual stress reduction caused by magnetic treatment in steel is studied. From the experimental results it shows that the existence of residual stress in steel can have some effect on the magnetostriction behavior, and further on the magneto-vibration behavior. When there exists residual stress in steel specimen, the value and the range of the magneto-vibration are different from those without residual stress. And with the development of magneto-vibration its value and range move to those without residual stress gradually. On the other hand the residual stress in steel specimen can be reduced after magneto-vibration. Therefore it can be concluded that when there exists residual stress in steel the magneto-vibration and residual stress influence each other so that the magneto-vibration with residual stress has a non-linear characteristic.