Structural and Phase Transformation in Material of Steam Turbines Blades After High-Speed Mechanical Effect

Скотникова, М. А.; Крылов, Н. А.; Ivanov, Evgeniy Konstantinovich; Tsvetkova, Galina V.

doi:10.1007/978-3-319-29579-4_16

Cited by 8 publications

(3 citation statements)

References 1 publication

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“…1, c. As have shown results of raster electron microscopy, the loose surface of titanium chip is formed on the complex mechanism with attributes of destruction in able to super plasticity [24,25]. Thus, at cutting treatment in titanium alloys having a high strain and frictional heat, the low heat conduction and significant relaxation ability (structural and concentration), creates required dissipative change of structure and chemical composition in narrow periodic layers of metal (socalled frictional running-in metal).…”

Section: (Line 2)mentioning

confidence: 99%

Formation of Nanostructure and Tool Wear during Cutting Treatment of Titanium Alloy

Иванова

Padgurskas

Jankauskas

et al. 2019

KEM

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Methods of the optical metallography, TEM, SEM-technique, tests for hardness and wear resistance are used to investigated the structural - phase transformation in metal blanks from alloy VT23 at cutting treatment in an interval of speeds 2...120 m/min are given. The patterns of interaction of dynamic plastic deformation and destructions on macro-, meso-, micro-and nanolevels are determined. It is shown that the formation in metal blank of modulated high-tensile secondary nanostructures promotes a heightening of a protective wearproofity of treated metal blank, but cutting edge, lowering a wearproofity, of the cutting tool.

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Section: (Line 2)mentioning

confidence: 99%

Formation of Nanostructure and Tool Wear during Cutting Treatment of Titanium Alloy

Иванова

Padgurskas

Jankauskas

et al. 2019

KEM

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“…Ultrafine-grained (UFG), as well as nanocrystalline (NC) metals and alloys having a grain size (0,1-1,0 µm) and (less 100 nm), accordingly, high pressure torsion (HPT) is obtained [1][2][3], equal channel angular pressing (ECAP) [4][5][6], surface plastic deformation [8][9][10][11][12], in places of localization of shift in shaving at high-speed machining of metals [13][14][15] and other methods of severe plastic deformation (SPD).…”

Section: Introductionmentioning

confidence: 99%

Effect of Severe Plastic Deformation on the Structure and Properties of the Aluminum Alloy System Al-Cu-Mg

Paitova

Bobruk

Shasherina

et al. 2019

KEM

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The structure and properties of discs from cast coarse-grained D16 alloy have been investigated with the help of optical metallography and transmission electron microscopy, after the traditional heat treatment (HT) modes or subjected to high pressure torsion (HPT) under pressure in 6 GPa at room temperature. Standard HT modes included: Т4 (hardening 495°С + natural aging at room temperature for 5 days) and Т6 (hardening 495°С + artificial aging at 185°С for 10 hours). It is shown that after HT of alloy D16 according to modes T6 and Т4, the sizes of the structural elements, compared with the original, decreased by about 4,8 times and the microhardness increased by 1,6 times. It is shown that after one or ten rotates of HPT in D16 alloy the sizes of structural elements, in comparison with initial, decreased by 393 and 899 times, and microhardness increased by 2,4 and 2,9 times, respectively. Detection of hardening hard, brittle and high-alloy copper γ2- phases (Cu9Al4) indicates the passage in the HPT process of the decomposition of a supersaturated solid solution (dynamic aging) in the planes of a local shift.

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“…The alloys have different grain size and microstructure thus having different outcome and cause of failure. This is because microstructure plays a significant role in influencing the performance and lifespan of the gas turbine blade [3,4]. Since the blades are prone to tough environment (high heat and pressure), turbine blades are normally limiting component in a gas turbine which requires consistence inspection to avoid failure unexpectedly [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Boundary Formation in Microstructural Changes in IN 738 Service Exposed Turbine Blade

et al. 2018

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Microstructural changes on a Nickel based superalloy service exposed gas turbine blade after 52,000 hours at 720°C temperature was investigated. The study examines the grain boundary growth sizes; the changes with respect to gamma prime (γi) precipitate and phase distributions that occurred during operation. In order to observe the changes some different portions of the turbine blade undergone scanning electron microscope (SEM) to determine the grain size measurement and the EDX was used to evaluate the elemental analysis. The grain growths were discrete in formation along the grain boundary (GB) and little difference in the size of (γi) precipitates existed in different locations. The gradual transition of grain boundary-carbide morphology from the original fine discrete to fine semi-continuous, continuous film-like and finally coarse is observed in the specimens. The changes mostly evolves around two distinct phases which is from the solid to the equilibrium (sigma coarse phase) and then back to the solid (hardening gamma prime precipitate) phase. The grain size of (γi) precipitate varies throughout the surface of the turbine blade and there is a significant difference between the leading and trailing edge. The microstructural changes on the serviced blade can be interpreted to indicate that no obvious microstructural degradation and phase deformation occurred during exposure time.

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Structural and Phase Transformation in Material of Steam Turbines Blades After High-Speed Mechanical Effect

Cited by 8 publications

References 1 publication

Formation of Nanostructure and Tool Wear during Cutting Treatment of Titanium Alloy

Formation of Nanostructure and Tool Wear during Cutting Treatment of Titanium Alloy

Effect of Severe Plastic Deformation on the Structure and Properties of the Aluminum Alloy System Al-Cu-Mg

Effect of Grain Boundary Formation in Microstructural Changes in IN 738 Service Exposed Turbine Blade

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