Anelastic Damping of Resonant Ultrasound Spectroscopy (RUS) in Ni-rich Solid Solution Alloys at Very High Temperatures

极高温度下富镍固溶体合金中共振超声光谱 (RUS) 的滞弹性阻尼

• 批准号: 526145730
• 负责人: Professor Dr.-Ing. Uwe Glatzel
• 金额: --
• 依托单位: Lehrstuhl Metallische Werkstoffe
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/526145730?language=en
• 关键词: Anelastic; Damping; Resonant; Ultrasound; Spectroscopy

The element rhenium (Re) is largely responsible for the outstanding mechanical properties of nickel-base superalloys at high temperatures. As a material for turbine components, these alloys are also exposed to vibration. The resonance ultrasonic spectroscopy (RUS) can be used to precisely determine the orientation-dependent elastic constants until damping occurs. Significant damping sets in, depending on the alloy, at about 1000°C, well below the solidus temperature of ~1350°C. There is currently little knowledge about the composition-dependent damping properties in this temperature and frequency range. At the Chair of Metals and Alloys, a self-made RUS apparatus has been put into operation, with which measurements up to 1500°C are possible. Preliminary work shows that solid solution strengtheners such as Re influence the damping properties of Ni-rich solid solutions at very high temperatures. A high proportion of heavy alloying elements significantly lowers the activation energy and onset temperature of damping. There is evidence that the observed damping is due to defect transport along the alternating strain field. In the proposed project, data will be generated to support this hypothesis. The following three main questions arise. 1) How can damping in resonance ultrasonic spectroscopy in the frequency range 50 - 500 kHz be quantified precisely and reproducibly over a wide temperature range? 2) How do refractory alloying elements such as Re and Ru affect the temperature-dependent damping properties of the Ni-rich solid solution matrix quantitatively? 3) What rules for predicting the temperature-dependent mechanical damping can be determined from these observations? To answer these questions, the experimental setup must be optimized with respect to a minimum base damping of measurement and to the automated evaluation of the resonance peaks. The influence of the process route on the damping properties is to be quantified by further investigations to define standards for the further investigations. The influence of the alloying elements Re and Cr on RUS damping will be determined using single-phase samples. From the quantitative measurements of the damping properties of the samples containing Re and Cr, a model will be derived from which rules for the the design of alloys with optimized damping behavior can be derived.

镍基高温合金在高温下具有优异的机械性能，主要是由于元素Re（铼）。作为用于涡轮机部件的材料，这些合金也暴露于振动。共振超声光谱（罗斯）可以用来精确地确定取向依赖的弹性常数，直到阻尼发生。取决于合金，在约1000°C时，显著的阻尼开始，远低于约1350°C的固相线温度。目前，在此温度和频率范围内，对组成相关的阻尼特性知之甚少。在金属和合金的椅子上，自制的罗斯装置已经投入使用，使用该装置可以测量高达1500°C的温度。初步工作表明，固溶体强化剂，如Re的影响，在非常高的温度下的阻尼性能的富镍固溶体。高比例的重合金元素显著降低阻尼的激活能和起始温度。有证据表明，所观察到的阻尼是由于缺陷运输沿着交变应变场。在拟议的项目中，将生成数据来支持这一假设。出现了以下三个主要问题。1)如何在50 - 500 kHz频率范围内的共振超声光谱中的阻尼在宽温度范围内精确且可重复地量化？2)难熔合金元素Re和Ru如何定量影响富Ni固溶体基体的温变阻尼性能？3)根据这些观测结果，可以确定哪些规则来预测与温度相关的机械阻尼？为了回答这些问题，实验装置必须在测量的最小基础阻尼和共振峰的自动评估方面进行优化。工艺路线对阻尼性能的影响将通过进一步的研究来量化，以确定进一步研究的标准。 将使用单相样品确定合金元素Re和Cr对罗斯阻尼的影响。 从含Re和Cr的样品的阻尼性能的定量测量，将导出一个模型，从该模型中可以导出具有优化阻尼行为的合金的设计规则。