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利用涡流方法和常规硬度分析法对常用的淬火钢—40C r钢的淬硬层深度进行了检测。通过对检测所得涡流信号的分析、计算及其与硬度实验法测算结果的对比,发现涡流无损检测拟合计算方法与硬度分析法的结果最大相对偏差平均小于6%。本研究将最小二乘法用于涡流硬度检测拟合,拟合值与实测的最大相对偏差为0.55%,拟合率达到了99%,并由此得出了涡流检测淬火钢淬硬层深度的规律。研究结果表明,涡流检测方法可以作为一种可靠的无损检测方法来进行淬硬层深度的测算,且所得结果的误差较小。
The hardened layer depth of commonly used quenched steel-40Cr steel was tested by eddy current method and conventional hardness analysis. Through the analysis and calculation of the eddy current signal obtained from the test and comparison with the hardness test results, it is found that the maximum relative deviation between the eddy current non-destructive testing fitting method and the hardness testing method is less than 6% on average. In this study, the least square method was used to detect and fit the eddy current hardness. The maximum relative deviation between the fitted value and the measured value was 0.55% and the fitting rate reached 99%. The eddy current was used to measure the depth of hardened layer law. The results show that the eddy current testing method can be used as a reliable non-destructive testing method to calculate the depth of hardened layer, and the error of the obtained results is small.