静载拉伸过程中Q235钢屈服行为与磁畸变关系研究  

Research on Relationship Between Yield Behavior and Magnetic Distortion of Q235 Steel Under Static Tensile Test

作　　者：于敏[1] 缑瑞宾[1] 仇飞 王旭明[3] 

机构地区：[1]安徽科技学院建筑学院,安徽凤阳233100 [2]浙江省特种设备检测研究院,浙江杭州310020 [3]中国电力科学研究院,北京100055

出　　处：《热加工工艺》2017年第10期90-93,共4页Hot Working Technology

基　　金：安徽高校省级自然科学研究项目(KJ2013B084);安徽高校自然科学研究项目(KJ2016A181);安徽科技学院重点学科团队项目(AKZDXK2015C03);安徽科技学院青年基金项目(ZRC2013336);安徽科技学院自然科学研究项目(ZRC2013384)

摘　　要：为研究屈服过程中磁记忆信号异常变化(磁畸变)产生及扩展的规律,对Q235无缺陷试样进行静载拉伸试验,在不同阶段进行应变测量和磁记忆信号检测,可精确捕捉各应变监测点发生屈服的临界时刻和位置,并在各监测点屈服时停机卸载进行磁记忆信号测量,实现了屈服和磁畸变对应关系的研究。结果表明:磁畸变仅发生在屈服阶段,磁畸变与屈服具有一一对应关系;均匀变形引起磁正常波动,不均匀变形引起磁畸变;磁记忆信号对屈服非常敏感,使采用磁记忆定量评价局部屈服问题成为可能。In order to study the rule of appearance and propagation of anomalous change of magnetic memory （MMM） signals during yield period, the static tension tests were applied to Q235 specimens without defects. The strain measurementand magnetic memory signal detection was done at different stages,and then the critical time and position of the occurrence of the yield of different strain points can be accurately captured, and MMM signals were tested at the time when each preset point began to yield. The research of the corresponding relation of magnetic distortion and yield was realized. The results show that： the magnetic distortion just occurs in the yield period, and the magnetic distortion and yield has one to one correspondence. The uniform deformation can cause regular change of MMM signals and the inhomogeneous deformation induces magnetic distortion. MMM signal is sensitive to yield, and it becomes possible that local yield can be quantitative assessed by using MMM technique.

关 键 词：金属磁记忆 局部屈服 静载拉伸 磁畸变 应变测量 

分 类 号：TG115.28[金属学及工艺—物理冶金]