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首页> 外文期刊>Journal of Nondestructive Evaluation >Influence of Local Mechanical Parameters on Ultrasonic Wave Propagation in Large Forged Steel Ingots
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Influence of Local Mechanical Parameters on Ultrasonic Wave Propagation in Large Forged Steel Ingots

机译：局部机械参数对大型锻造钢锭超声波传播的影响

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摘要

In numerous applications, high strength forged steel requires uncompromising quality and mechanical properties to provide advanced performances. Ultrasonic testing are commonly used for material characterization to measure mechanical properties and for nondestructive testing to detect flaws or other features contained in metallic objects. In steel blocks of relatively small dimensions (at least two dimensions not exceeding a few centimeters), temperature and homogeneity are well controlled during the solidification. However, these parameters may become difficult to control during manufacturing of large objects. Forging and heat treatments are known to modify the microstructure and/or the grain size, therefore affecting elastic properties, and consequently, the ultrasonic inspection reliability. In this context, the relationship between ultrasonic group and phase velocity variations with local properties of a forged and heat-treated kg bainitic steel block manufactured in an industrial setting was investigated. The block was cut into a 20 mm thick slice that was then divided into 875 parallelepiped samples. A subset was selected for ultrasonic measurements, metallurgical study, and chemical analysis. Ultrasonic phase velocity showed a strong correlation with grain size, whereas group velocity was shown to vary as a function of the Young's modulus and the chemical composition. Tensile testing was performed to validate the Young's modulus calculated from the ultrasonic group velocities.
机译：在许多应用中，高强度锻造钢需要不妥协的质量和机械性能以提供先进的性能。超声波测试通常用于材料表征，以测量机械性能和非破坏性测试，以检测金属物体中包含的缺陷或其他特征。在相对较小尺寸的钢块（至少两个尺寸不超过几厘米），在凝固过程中，温度和均匀性良好地控制。然而，在大物体制造期间，这些参数可能变得难以控制。已知锻造和热处理可改变微观结构和/或晶粒尺寸，从而影响弹性性能，从而影响超声波检查可靠性。在这种情况下，研究了超声波基团与局部性能与工业设定中制造的锻造和热处理的kg贝氏体钢块局部性能之间的关系。将该块切成20mm厚的切片，然后分为875个平行六面体样品。选择了一个超声测量，冶金研究和化学分析的子集。超声阶段速度显示出与晶粒尺寸的强相关，而群体速度被示出为杨氏模量和化学成分的函数变化。进行拉伸测试以验证由超声波群速度计算的杨氏模量。

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