磁记忆检测力-磁效应微观机理的试验研究

Experimental Research on Microcosmic Mechanism of Stress-Magnetic Effect for Magnetic Memory Testing

铁磁材料在地磁场环境中受载荷的作用,其内部会发生具有磁致伸缩性质的磁畴组织定向和不可逆的重新取向。将去应力退火后的20钢和45钢压缩试件分别施加不同载荷并制作成金相观察试样,利用粉纹法观察受力程度不同的试件的磁畴结构,然后,对比同种材料不同载荷试样的磁畴结构照,分析不同残余应力对磁畴的影响。试验表明:未受力或应力集中较小时,晶粒内磁畴以片状畴为主,同一晶粒内畴壁相互平行,随着应力集中程度的增加,磁畴结构出现迷宫畴。且应力集中程度越大,迷宫畴个数越多,同时畴壁长度和间距发生改变。

Influenced by the earth magnetic field,the irreversible reorientation of domain organization with the characteristic of magnetostriction will be occurred in internal organization of the loaded ferromagnetic material.The different compressed loads are exerted onto the 20 steel and 40 steel specimens which are annealed,then make them into the metallographic observation test specimens,and observe the magnetic domain structure by the Bitter Method.Then contrast the magnetic domain structures of different specim...