35号冷轧钢在不同阶段应力作用下的磁效应特征  

Studies on the Relationship Between Stress in Different Range with Magnetic Effects for 45 Steel Components

作　　者：任尚坤[1] 任吉林[1] 邬冠华[1] 宋凯[1] 杨雅玲[1] 

机构地区：[1]南昌航空大学无损检测技术教育部重点试验室,南昌330063

出　　处：《无损检测》2008年第4期244-247,254,共5页Nondestructive Testing

基　　金：航空科学基金资助项目(06ZF56009);无损检测技术教育部重点试验室基金资助项目(ZD200629001);南昌航院科研基金资助项目(EA200508146)

摘　　要：在反复加载-卸载条件下,测量了35号冷轧钢试件在不同的最大拉应力作用下,试件表面某确定点漏磁场随拉应力的对应关系。试验结果表明,当最大拉应力σmax为255～496MPa时,磁感应强度-应力(B-σ)近似呈线性关系变化;当σmax为535～611MPa时,B-σ关系由直线变为折线,并且折线极值点的位置处于100～200MPa之间;当σmax为637～662MPa时,B-σ曲线极值点的位置处于382MPa处,磁感应强度的变化量迅速增大;当σmax为687MPa时,B-σ关系曲线的极值点移到458MPa处,磁感应强度的变化量进一步增大。试验得到了试件在拉应力作用下的磁化关系,证实了可以通过磁信号的大小对试件的安全性作出评估。The relationships of magnetization and stress with different maximum stresses of 35 steel items were measured,during process of extension and shrinkage.It indicated that when the maximum stresses was higher than 255 MPa and lower than 496 MPa,the relationships of magnetization and stress were linear.When the maximum stresses was higher than 535 MPa and lower than 611 MPa,the relationships of magnetization and stress became a broken line and the position of extremum of the line was at about 150 MPa.When the ...

关 键 词：无损检测 应力 磁记忆效应 

分 类 号：TG115.284[金属学及工艺—物理冶金]