[1]苏三庆,胡敬余,王 威,等.不同应力状态下Q235钢板件磁信号变化的试验及金相图谱研究[J].西安建筑科技大学学报(自然科学版),2019,51(05):617-622642.[doi:10.15986/j.1006-7930.2019.010.001]
　SU Sanqing,HU Jingyu,WANG Wei,et al.Experimental study and metallographic schematic on magnetic signal changes of Q235 steel at different stages[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2019,51(05):617-622642.[doi:10.15986/j.1006-7930.2019.010.001]
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不同应力状态下Q235钢板件磁信号变化的试验及金相图谱研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
51
期数:
2019年05期
页码:
617-622642
栏目:
出版日期:
2019-12-05

文章信息/Info

Title:
Experimental study and metallographic schematic on magnetic signal changes of Q235 steel at different stages
文章编号:
1006-7930(2019)05-0617-06
作者:
苏三庆; 胡敬余; 王 威; 郭 欢; 马小
(西安建筑科技大学 土木工程学院,陕西 西安 710055)
Author(s):
SU Sanqing;  HU Jingyu;  WANG Wei;  GUO Huan;  MA Xiaoping
(School of Civil Engineering, Xi’an Univ. of Arch. & Tech., Xi’an 710055, China)
关键词:
金属磁记忆检测;  不同应力状态;  法向磁信号;  磁场梯度;  金相组织
Keywords:
metal magnetic memory testing;  stress stage;  magnetic signals;  magnetic field gradient;  metallographic microstructure
分类号:
TU391
DOI:
10.15986/j.1006-7930.2019.010.001
文献标志码:
A
摘要:
通过对Q235钢板件进行静载拉伸试验,采集并分析了其在零载、弹性状态、塑性状态、强化状态、颈缩状态及断裂破坏后的法向磁信号Hp(y).试验表明,随着荷载的增加,法向磁信号Hp(y)曲线呈顺时针旋转,且Hp(y)零值点在试件中心位置附近; Hp(y)零值点可以指示断裂位置但不够准确.比较分析磁场梯度值K,可以发现K值随荷载增加单调递减,在塑性状态到强化状态时变化幅度最大,而在强化状态到颈缩状态变化幅度最小.另外,通过对不同应力状态的试件取样,进行金相图谱分析,发现随着荷载的增加,铁素体沿受力方向,由不规则形状逐渐变为纺锤形,在此过程中,法向磁信号Hp(y)的绝对值逐渐变大.
Abstract:
The normal magnetic signal Hp(y)at zero loading, elastic stage, plastic stage, strengthening stage, necking stage and fracture failure were collected and analyzed respectively by the static tensile experiment of Q235 steel. Test result exhibits that with the increase of loading, the normal magnetic signal Hp(y)curve rotates counter clockwise, and the magnetic zero value point of Hp(y)is near the center of the specimen. The zero value of Hp(y)can indicate the location of fracture but not accurately. Comparative analysis of the gradient value K, magnetic K value can be found monotone decreasing with the loading increasing. Magnetic gradient K has the biggest change from the plastic phase to strengthening stage, but it has a minimal vitiate from strengthening phase to necking stage. In addition, metallographic schematic of specimens are analyzed at different stress states, indicat that the ferrite of specimens in irregular shape gradually becomes a spindle along the tensile direction with the increase of loading, and in the process, the absolute value of the magnetic signal Hp(y)increases gradually.

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备注/Memo

备注/Memo:
收稿日期:2018-07-30 修改稿日期:2019-09-23基金项目:国家自然科学基金项目(51878548, 51578449),陕西省自然科学基础研究计划(2018JZ5013)第一作者:苏三庆(1961-),男,教授,博士生导师,主要从事结构抗震设计、结构健康监测方面的研究. E-mail:sussq@xauat.edu.cn
更新日期/Last Update: 2019-12-05