34CrMo4钢拉伸过程中磁记忆信号分析  

Analysis of Magnetic Memory Signals of 34CrMo4 Steel during Tensile Process

作　　者：赵海江[1,2] 关卫和[1,2] 郭鹏举 

机构地区：[1]浙江工业大学化工机械设计研究所,杭州310014 [2]国家压力容器与管道安全工程技术研究中心,合肥230031

出　　处：《无损检测》2013年第8期1-3,13,共4页Nondestructive Testing

基　　金：国家科技部863资助项目(2012AA040103)

摘　　要：针对34CrMo4钢弧状试件表面法向磁场强度Hp(y)和磁场梯度的绝对值|k|随拉应力σ的变化规律进行了试验。结果表明:当拉应力低于屈服强度时,Hp(y)分布范围及|k|值均随σ的增加而增大;加载至接近屈服强度时,两者达到饱和。进入塑性变形阶段后,Hp(y)分布范围及|k|值下降明显,并对这一现象进行了解释。The variation of magnetic field intensity Hp（y） and the absolute value of magnetic gradient ｜k｜ with tensile stress of 34CrMo4 steel were studied during tensile testing. It was found both Hp （y） and ｜k｜ increased with the increase of a in the elastic stage, and reached the maximum values closing to yielding stress. However, Hp （y） and ｜k｜ decreased abruptly in the plastic stage, which was explained in detail in the paper.

关 键 词：34CrMo4 金属磁记忆 拉伸 磁场强度 磁场梯度 

分 类 号：TG115.28[金属学及工艺—物理冶金]