| 引用本文: | 杨晓惠,谭川东,唐名杰,周鹏伍,唐义超,刘艳军.X80管线钢不同变形状态的磁记忆检测试验研究[J].材料科学与工艺,2021,29(2):51-57.DOI:10.11951/j.issn.1005-0299.20190222. |
| YANG Xiaohui,TAN Chuandong,TANG Mingjie,ZHOU Pengwu,TANG Yichao,LIU Yanjun.Experimental investigation on magnetic memory testing for different deformation states of X80 pipeline steel [HJ1.2mm][J].Materials Science and Technology,2021,29(2):51-57.DOI:10.11951/j.issn.1005-0299.20190222. |
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| 摘要: |
| 为探明管线钢在不同变形状态的力磁耦合特性,以实现油气管道塑性变形损伤的早期预警,本文开展了X80管线钢在弹塑性变形阶段的磁记忆检测试验研究。采用疲劳试验机对标准板状试件导入不同变形状态,通过应力-应变监测系统获取试件的实时应变情况,同时利用磁记忆检测仪对卸载后的试件表面磁场强度进行离线扫描。结果表明:在弹性变形阶段,磁场强度分布曲线表现出线性程度较好的直线,在塑性变形阶段则出现局部畸变；以磁场强度法向分量的斜率和切向分量的绝对值为特征参数,其随应力增加先增大后减小的变化规律反映了材料的弹塑性转变过程；利用改进的J-A磁机械模型可以合理地解释弹塑性变形过程中磁信号的反转现象；切向分量对局部塑性变形的表征比法向分量更为敏感,根据切向分量的变化可以判定试件是否进入塑性变形阶段,根据切向磁场梯度最大值与应力的量化关系,可以表征试件的应力集中状态,为塑性变形损伤的诊断提供依据。 |
| 关键词: X80管线钢 磁记忆检测 弹塑性变形 拉伸载荷 特征参数 |
| DOI：10.11951/j.issn.1005-0299.20190222 |
| 分类号:TG115.28 |
| 文献标识码:A |
| 基金项目: |
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| Experimental investigation on magnetic memory testing for different deformation states of X80 pipeline steel [HJ1.2mm] |
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YANG Xiaohui, TAN Chuandong, TANG Mingjie, ZHOU Pengwu, TANG Yichao, LIU Yanjun
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(School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China)
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| Abstract: |
| In order to probe the coupling characteristics of the pipeline steel in different deformation states and achieve the early warning of the plastic deformation damage of the oil and gas pipeline, the magnetic memory tests of X80 pipeline steel were carried out during the elastic-plastic deformation stage. A fatigue testing machine was used to guide the standard plate specimen into different deformation states, and the real-time strain of the specimen was obtained by using the stress-strain monitoring system. Meanwhile, the magnetic field intensity on the surface of the specimen after unloading was scanned off-line by using the magnetic memory detector. The results indicated that during the stage of elastic deformation, the distribution curve of magnetic field strength showed an excellent linear feature, whereas during the stage of plastic deformation, a local distortion appeared. The characteristic parameters, i.e., the slope of the normal component and the absolute value of the tangential component, increased first and then decreased with increasing the stress, reflecting the elastic-plastic transformation process of the material. The phenomenon of magnetic signal inversion in the process of elastic-plastic deformation could be reasonably explained using the improved J-A magneto-mechanical model. It is found that, compared with the normal component, the tangential component is more sensitive to the characterization of local plastic deformation. According to the variation of tangential component, it could be determined whether the specimen is in the plastic deformation stage or not. According to the quantitative relationship between the maximum value of the tangential magnetic field gradient and the stress, the stress concentration state of the specimen can be characterized, which provides the basis for the diagnosis of plastic deformation damage. |
| Key words: X80 pipeline steel magnetic memory testing elastic-plastic deformation tension load characteristic parameter |
