多晶金属材料超声无损表征方法研究综述

A Review of Ultrasonic Methods Used for Nondestructive Characterization of Polycrystalline Materials

线性及非线性超声技术是多晶金属材料特性无损表征的主要研究方法。本文介绍了超声技术在多晶金属材料特性无损表征的研究与典型应用,包括对弹性模量、平均晶粒度、应力、力学性能退化等。通过超声表征结果探究金属材料的内部特性,对材料能否安全服役做出无损评价;阐述了与传统检测方法相比,超声表征方法在分析多晶金属材料的内部缺陷与特性方面具有的优势。最后介绍了本团队在超声与多晶微结构之间的相关性以及对多晶材料平均晶粒尺寸超声表征所展开的工作与研究,并提出了该领域需要进一步研究的方向与目标。

Properties of polycrystalline materials are mainly evaluated by the linear and nonlinear ultrasonic methods in a nondestructive way. This paper reviews some typical research and application of ultrasonic characterization on polycrystalline materials, such as the evaluation of elastic modulus, average grain size, stress, and mechanical properties degradation. These parameters obtained by ultrasonic technology were used to evaluate the safety of materials in service. Ultrasonic methods applied to analyze flaws in the materials have obvious advantages compared to the traditional de-tection methods. Meanwhile, the investigation of correlation between ultrasonic parameters and polycrystalline microstructure was presented, especially for the characterization of the average grain size of titanium alloy. At last, we showed potential research on ultrasonic nondestructive characterization of polycrystalline materials in the future.