Detection of Decarburising Depth in Hadfield Steels Using a Multi-magnetic NDE Method
Detection of Decarburising Depth in Hadfield Steels Using a Multi-magnetic NDE Method
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DOI：
10.1080/10589759.2022.2038150
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发表时间：
2022-02-15
影响因子：
2.6
通讯作者：
Zhou, Lei
中科院分区：
文献类型：
--
作者：
Kahrobaee, Saeed;Akhlaghi, Iman Ahadi;Zhou, Lei
本文报道了一系列电磁无损评价（NDE）方法对高锰钢脱碳现象的评价能力。将四个Hadfield钢样品在空气炉中在1050 ℃下淬火1、2、3和4小时，然后进行水淬以产生各种脱碳深度。脱碳深度的特点是使用硬度分布测量，光学和扫描电子显微镜，和X射线衍射分析。结果证实了脱碳的发生，并存在35至110 μ m的表面马氏体层，具体取决于奥氏体化时间。在表面的微观结构的变化会影响样品的磁性能，并使电磁无损检测方法，以检测转化层定量。在非破坏性表征步骤中，报告了磁化时间与漏磁（MFL）、初始磁化曲线（BH）和涡流（EC）方法的输出之间的关系。比较从三个磁性无损检测方法得到的结果，可以得出结论，MFL和EC（相位角输出）有可能量化的表面微观结构的变化发生的脱碳过程中的结果在哈德菲尔德钢。
This paper reports the capability of a range of electromagnetic non-destructive evaluation (NDE) methods to characterise the decarburising phenomena in Hadfield steels. Four Hadfield steel samples were austenitised at 1050 degrees C for 1, 2, 3 and, 4 hours in an air furnace followed by water quenching to produce various decarburising depths. The decarburisation depth was characterised using hardness profile measurements, optical and scanning electron microscopy, and X-ray diffraction analysis. The results confirmed the occurrence of decarburising and presence of a surface martensite layer of 35 to 110 mu m depending on austenitisation time. The microstructural change at the surface affects the magnetic properties of the sample and enables electromagnetic NDE methods to detect the transformed layers quantitatively. In the non-destructive characterisation step, the relationships between the austenitising time and the outputs from magnetic flux leakage (MFL), initial magnetisation curve (BH) and eddy current (EC) methods are reported. Comparing the results obtained from the three magnetic NDE methods, it can be concluded that MFL and EC (phase angle output) have the potential to quantify the surface microstructural changes occurring as a result of the decarburising process in Hadfield steels.