Abstract
Microstructural stability is one of the utmost important requirements for metallic materials in engineering applications, particularly at high temperatures. The paper shows how Mechanical Spectroscopy (MS) (i.e., damping and dynamic modulus measurements) permits the monitoring of the evolution of lattice defects, porosity, and cracks which strongly affect the mechanical behavior of metals and sometimes lead to permanent damage. For this purpose, some applications of the technique to different metals and alloys (AISI 304 stainless steel, PWA 1483 single crystal superalloy, nanostructured FeMo prepared via SPS sintering and tungsten) of engineering interest are presented. These experiments have been carried out in lab conditions using bar-shaped samples at constant or increasing temperatures. The results can be used to orient the interpretation of frequency and damping changes observed through other instruments in components of complex shape during their in-service life.
Highlights
Mechanical Spectroscopy (MS) provides damping and dynamic modulus of a material under different conditions of strain and temperature
MS is commonly employed for investigating physical phenomena but can be very useful for solving practical problems related to industrial processes, such as the determination of the amount of carbon, oxygen, nitrogen, and hydrogen in solid solution in steels and other metals; the monitoring of precipitation and ordering in metallic alloys; the identification of superplastic regime; and the characterization of magnetoelastic effects
According to Equations (2) and (3), the mean length of dislocation segments l at increasing temperature has been calculated on the basis of ∆E/E determined from MS test and ξ measured by X-ray diffraction (XRD)
Summary
Mechanical Spectroscopy (MS) provides damping and dynamic modulus of a material under different conditions of strain and temperature. MS is commonly employed for investigating physical phenomena but can be very useful for solving practical problems related to industrial processes, such as the determination of the amount of carbon, oxygen, nitrogen, and hydrogen in solid solution in steels and other metals; the monitoring of precipitation and ordering in metallic alloys; the identification of superplastic regime; and the characterization of magnetoelastic effects. This technique has been used by some of the present authors to study the mechanical instability of metals taking place in a temperature range before melting (e.g., see [3]). Crystal superalloy, nano‐structured FeMo prepared via SPS sintering and tungsten) are presented
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