We perform the comparative analysis of the parameters of acoustic structural noise in specimens of 40G structural steel with the use of ultrasonic flaw detectors with phased arrays. It is shown that the parameter of integral density of B-scan images most completely reproduces the variations of energy of acoustic vibrations reflected from the microstructural inhomogeneities (grain-size inhomogeneity, changes in the ratios of the phase components). The relationship between the parameter of integral density of the image of acoustic structural noise Ro and the mechanical properties of 40G steel is established. We propose an improvement of the well-known method of determination of the yield limit σy of steels according to the results of measurements of the HB hardness. To do this, we added the parameter Ro to the equation used for computations. As a result, we deduced a new equation of the form σy = f (Ro, HB) for the yield strength of 40G steel within the specified range of its values.

中文翻译：

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结构噪声参数与结构钢力学性能的关系

我们使用相控阵超声波探伤仪对40G结构钢试样的声学结构噪声参数进行了对比分析。结果表明，B 扫描图像的积分密度参数最完整地再现了从微观结构不均匀性（晶粒尺寸不均匀性、相分量比率的变化）反射的声振动能量的变化。建立了声结构噪声Ro图像积分密度参数与40G钢力学性能的关系。我们建议根据 HB 硬度的测量结果，改进众所周知的确定钢的屈服极限 σy 的方法。为此，我们将参数 Ro 添加到用于计算的方程中。