Structural changes in the surface layers of an EK79-ID alloy upon hardening treatments

Павленко, Д. В.; Loskutov, Stephan; Yatsenko, V. K.; Гончар, Наталья Викторовна

doi:10.1134/1.1573312

Cited by 3 publications

(2 citation statements)

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“…The sensitivity of the mechanical, physical, and structural characteristics of the surface layer material to deformation hardening makes it possible to control them in order to increase the bearing capacity of the parts [1]. The effectiveness of the use of surface hardening (SH) for parts from different classes of materials operating in the range of moderate temperatures is currently quite well theoretically substantiated and experimentally confirmed.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the efficiency of finishing-hardening treatment of gas turbine engine blades

Павленко

Kondratiuk

Torba

et al. 2022

EEJET

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This paper considers the influence of the technology to finish and strengthen compressor blade tips made of EP718-ID alloy on the characteristics of the surface quality, surface layer, and bearing capacity. Taking into consideration the special role of the finishing-strengthening treatment in the formation of the quality of the surface layer, various options for blade tip processing were investigated. The blade tips were shaped by high-speed line milling. The finishing-strengthening stage of tip machining included manual polishing and ultrasonic hardening operations with steel balls in various combinations. The basic regularities have been established in the formation of the roughness of tip surfaces, the maximum height of micro-irregularities, the surface microhardness, and the propagation depth of the hardened layer, depending on the combination of finishing-strengthening machining techniques. The results of tests are given for multi-cycle fatigue of blade batches treated according to various variants of the technological process. The efficiency of polishing the surface of the tip after strengthening treatment has been established. To restore the quality characteristics of the surface layer after polishing, it is proposed to perform repeated strengthening treatment. It is shown that the use of double deformation hardening technology with intermediate polishing at the finishing-strengthening stage of blade manufacturing makes it possible to increase the endurance limit from 320 MPa to 400 MPa while increasing durability. Technology for the finishing-strengthening stage of machining blades made from nickel alloys, characterized by significant viscosity, has been devised. It is shown that based on the criteria of minimum labor intensity of machining and maximum endurance of blades, it is effective to use double deformation hardening with steel balls in an ultrasonic field with intermediate polishing.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Improving the efficiency of finishing-hardening treatment of gas turbine engine blades

Павленко

Kondratiuk

Torba

et al. 2022

EEJET

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“…Follow ing analysis in [22][23][24] and using the relation between elastic moduli c 11 , c 12 , and c 44 and Young's modulus for fcc crystals in the harmonic approximation [21], we can obtain the following calibration dependence between the indentation parameters and the mechan ical properties of the material (indentation equation):…”

Section: Nanoindentation Study Of the Effect Of The Structural State 541mentioning

confidence: 99%

Nanoindentation study of the effect of the structural state of the melt on the crystal structure and mechanical properties of the phases in an Al-50 wt % Sn alloy

et al. 2013

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Abstract-Nanoindentation is used to measure Young's modulus, the hardness, the plasticity, and the yield strength of the phases in Al-50 wt % Sn alloy samples prepared by a traditional method and using liquid state homogenization. The effect of an increase in the cooling rate by an order of magnitude and alloying with 0.06 wt % Ti or 1 wt % Zr on the mechanical properties of the phases in the Al-50 wt % Sn alloy is studied. The most substantial effect on Young's modulus of the phases in the Al-50 wt % Sn alloy is found to be exerted by the homogenization of the metallic liquid and the introduction of zirconium in the alloy melt: the metal forming of an ingot is improved substantially.

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High‐Pressure Torsion: A Simulation Approach for Additive Friction Stir Deposition Processes

Pavlenko,

Tkach,

Vyshnepolskyi

et al. 2024

Advances in Materials Science and Engineering

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The technology of manufacturing aluminum alloy workpieces using additive friction stir deposition (AFS‐D) has been thoroughly investigated. The ambiguous influence of deformation processing modes on the material density was found. Examination of the microstructure in the central zone of the specimens reveals the absence of microdefects typically associated with workpieces obtained through casting or powder metallurgy methods. It has been observed that the distribution of microhardness is significantly affected by the direction of specimen construction, with approximately a 20% difference in values between the periphery and the central part of the specimen. Specimens produced using the AFS‐D method exhibit a homogeneous microstructure characteristic of deformable aluminum alloys. Notably, a uniform distribution of intermetallides on the specimen surface has been identified. This outcome is likely a result of the alloy undergoing recrystallization during the severe plastic deformation process, leading to the formation of an ultradisperse structure. It is important to emphasize that the selection of technological parameters for AFS‐D should consider not only the magnitude of pressure and deformation but also the deformation speed.

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Structural changes in the surface layers of an EK79-ID alloy upon hardening treatments

Cited by 3 publications

References 0 publications

Improving the efficiency of finishing-hardening treatment of gas turbine engine blades

Improving the efficiency of finishing-hardening treatment of gas turbine engine blades

Nanoindentation study of the effect of the structural state of the melt on the crystal structure and mechanical properties of the phases in an Al-50 wt % Sn alloy

High‐Pressure Torsion: A Simulation Approach for Additive Friction Stir Deposition Processes

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