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首页> 外文期刊>NDT & E international >Detection of plastic deformation in low carbon steel by SQUID magnetometer using statistical techniques
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Detection of plastic deformation in low carbon steel by SQUID magnetometer using statistical techniques

机译：使用统计技术的SQUID磁力计检测低碳钢中的塑性变形

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摘要

In order to non-destructively detect the amount of plastic deformation accumulated in low carbon steel of S25C, the distribution of localized magnetism has been measured for plate-type S25 tensile specimens with plastic strains up to 6.45 percent by ultrahigh sensitive magnetic probes using superconducting quantum interference device (SQUID). The slope value obtained from the SQUID signal pattern, which means the ratio of the change in SQUID output voltage to the change in AC current flow in the superconducting magnet, was chosen as a candidate indicator to detect plastic strains in the present study. For quantitative assessment, statistical processing was performed for determining the datum of the distribution of the slope value. As a result of the statistical approach, small-scale plastic deformation could be detected on S25C tensile specimens. It was suggested that the magnetic measurement using SQUID magnetometer supported by the statistical techniques was a promising non-destructive evaluation method to detect the amount of plastic deformation accumulated in low carbon steel.
机译：为了无损检测S25C低碳钢中累积的塑性变形量，使用超导量子探针通过超高灵敏磁探针对塑性应变高达6.45％的平板型S25拉伸试样测量了局部磁场分布干扰设备（SQUID）。从SQUID信号模式获得的斜率值（表示SQUID输出电压的变化与超导磁体中交流电流的变化之比）在本研究中被选为检测塑性应变的候选指标。为了进行定量评估，执行统计处理以确定斜率值的分布基准。作为统计方法的结果，可以在S25C拉伸试样上检测到小规模的塑性变形。有人认为，使用统计技术支持的SQUID磁力计进行磁测量是一种有前途的无损评估方法，可检测低碳钢中累积的塑性变形量。

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