Abstract
The study of the damping in the elastic vibration energy was conducted on the samples of steel Cr18Ni9Ti and 12Cr18Ni10Ti shaped as a solid rod and a capillary, respectively. Plasma coatings based on NiА1–SiO 2 ·Al 2 O 3 were researched in broad temperature and deformation ranges. The research has proved an essential influence of plasma nanostructured coatings applied as aerosils on the temperature and amplitude dependences of the internal friction in the sample composite materials. The research has revealed anomalies and peak effects in the coated samples in the temperature spectrum, both in the low-temperature and high-temperature areas. The study has revealed the effect of coating (NiА1–SiO 2 ·Al 2 O 3 ) on the peaks of various physical nature. The presence of complex damping characteristics is due to the complex microstructure of the coating that contains internal interfaces and pores. Moreover, additional damping mechanisms are realized at the interfaces of individual grains, particles, and also at the interphase interaction boundary in the “coating-base” system. The proposed damping criterion is based on understanding of the opposite influence of coatings on the display of various factors. Such factors include: an increase in the damping in the energy of elastic vibrations and, at the same time, fixation of dislocations and a decrease in the shear formation in the presence of nanocomponents in different coating zones.
Highlights
We set the following tasks: – to consider the peculiarities of damping in the energy elastic vibrations through measuring the internal friction of high-alloy steels with nanostructured plasma coatings; – to consider the effect of preliminary heat treatment of samples and make a comparative assessment of the level of energy absorption of elastic vibrations in samples shaped as solid cylinders and capillaries; – to assess the damping capacities of multicomponent nanostructured coatings used on steel samples and determine a parameter that could be taken as a damping criterion
12Cr18Ni10Ti with plasma coatings based on NiА1–SiO2× ×Al2O3 has proved a significant effect of the nanostructured coatings on the internal friction
The TDIF curves represent changes in the overall levels of the internal friction (IF), as well as changes in the anomalies shown as deformation peaks, the Finkelstein-Rosin effects, grain boundary peak (GBP), and phase peaks
Summary
Исследовано затухание инфразвука в сталях Х18Н9Т и 12Х18Н10Т с плазменными покрытиями на основе (NiАl– SiO2.Al2O3). Установлено влияние покрытий сложной микроструктуры с наносоставляющими в виде аэросилов на параметры внутренего трения исследуемых композиций. На температурном спектре при наличии покрытий выявлены аномалии в виде пиков различной физической природы. Ключевые слова: плазменное покрытие, внутреннее трение, демпфирование, наносоставляющие, аномальные свойства, модуль упругости
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