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Assessment of depth of case-hardening in steel rods by electromagnetic methods.

机译：用电磁方法评估钢中表面硬化的深度。

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摘要

Case depth measurements of surface hardened steel parts are important for quality control. The magnetic properties, including initial permeability, differential permeability and saturation magnetization of a series of induction-hardened and carburized steel rods were studied through measurements, with the aim of developing new methods to evaluate the case depth nondestructively. Four-point alternating current potential drop (ACPD) method also has the potential to evaluate different case depths. The potential drop was measured on a series of 1" diameter induction-hardened and carburized steel rod samples using a co-linear probe with pins aligned parallel to the axis of the rod.;For comparison with the above-mentioned electromagnetic measurements, hardness profiles were obtained by microhardness measurements.;It seems that measurements of initial permeability on surface hardened rods do not give a clear indication of case depth. Differential permeability was plotted versus applied magnetic field H. It is interesting to see that, when H is around 18 Oe, the differential permeability increases more-or-less in the sequence of case depth d in induction hardened samples. Differential permeability measurements give a good indication of case depth in induction hardened rods, but not carburized rods. The saturation magnetization decreases as the case depth increases. It was shown that four-point ACPD is a promising technique for distinguishing between different depths of case hardening. Especially in the low-frequency range of the real part of the normalized impedance, there is very good distinction between the case depths of the samples.
机译：表面硬化钢零件的表面深度测量对于质量控制很重要。通过测量研究了一系列感应淬火和渗碳钢的磁性能，包括初始磁导率，微分磁导率和饱和磁化强度，目的是开发新的方法来无损评估壳层深度。四点交流电势降（ACPD）方法也具有评估不同案例深度的潜力。电位降是使用同轴探针将一系列直径为1“的感应淬火和渗碳钢棒样品测得的，这些探针的销钉平行于棒的轴线对齐；为了与上述电磁测量结果进行比较，硬度分布图似乎没有对表面硬化棒的初始磁导率进行测量，不能清楚地表明表层深度，绘制了磁导率与施加磁场H的关系曲线，有趣的是，当H约为18时举例来说，在感应淬火样品中，磁导率差按表层深度d的顺序增加或减少，磁导率差的测量可以很好地表明感应淬火棒（而不是渗碳棒）的表层深度，饱和磁化强度随情况而减小结果表明，四点ACPD是区分表面硬化深度不同的有前途的技术。尤其是在归一化阻抗的实部的低频范围内，样本的外壳深度之间有很好的区别。

著录项

  • 作者

    Zhang, Chongxue.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.S.
  • 年度 2009
  • 页码 66 p.
  • 总页数 66
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

  • 入库时间 2022-08-17 11:38:29

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