外加磁场对Q235钢力磁效应影响试验研究  

Experimental study on the influence of external magnetic field on magneto-mechanical effect for Q235 steel

作　　者：樊清泉[1] 任尚坤[1] 任仙芝 许洋 段振霞[1] FAN Qingquan;REN Shangkun;REN Xianzhi;XU Yang;DUAN Zhenxia(Key Laboratory of Nondestructive Testing of Ministry of Education,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学无损检测技术教育部重点实验室

出　　处：《中国测试》2019年第6期46-53,共8页China Measurement & Test

基　　金：国家自然科学基金(51261023)

摘　　要：为研究外加磁场对铁磁材料力磁效应的影响,制作通不同大小直流电的螺旋管作为外加磁场,对带有圆孔缺陷的Q235钢试件进行干扰的静载拉伸试验。结果表明:在地磁场环境中,经去应力退火的试件在没有施加载荷时,初始磁感应强度值趋近于0,磁记忆信号曲线近似水平直线;在施加载荷时,法向磁信号和切向磁信号曲线均发生波动,产生非线性变化;在一定外加磁场范围内,在外加磁场方向和地磁场方向存在差异时,外加磁场与磁记忆信号具有不同的相关性,同向外加磁场越大时,应力集中区磁记忆信号愈加明显;外加磁场的大小不改变其法向和切向磁记忆信号曲线变化规律,但影响其磁感应强度B值和斜率K值的大小,并且对在弹性阶段和塑性阶段法向和切向磁记忆信号的影响也存在差异性。In order to study the effect of external magnetic field on the magneto-mechanical effect of ferromagnetic materials,the spiral tube with different sizes of direct current is used to apply the magnetic field for the test,which is the static tensile test of the Q235 steel specimen with circle hole defect. The result shows that in the geomagnetic environment, the initial magnetic induction value of specimens by stress relief annealing is similar to 0 without the external stress, and the magnetic memory signal curve approximate a horizontal line. Both the normal magnetic signal curve and the tangential magnetic signal curve produce fluctuation and nonlinear under the stress;within a certain external magnetic field. The different directions between the external magnetic field and the geomagnetic field makes the external magnetic field have different correlation with the magnetic memory signal, the larger the external magnetic field, the more obvious the magnetic memory signal in the area of stress concentration;the size of the external magnetic field don't change the variation low of the magnetic memory signal curve, but affect the size of the magnetic induction B and the slope K, and have different effects on the magnetic memory signals in the elastic stage and plastic stage.

关 键 词：金属磁记忆 外加磁场 静载拉伸 力磁效应 

分 类 号：TG115.28[金属学及工艺—物理冶金]