Features of microstructure formation during continuous aging in granulable nickel-based alloys

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Abstract

The influence of continuous aging on the microstructure of the granulated heat-resistant nickel-based alloy EP741NP is considered. The use of continuous aging made it possible to increase the density of γ´-phase particles, reducing their size and the degree of coagulation inside the grains, and to strengthen the boundaries with carbide and boride compounds.

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About the authors

D. S. Eliseev

«GIREDMET»

Author for correspondence.
Email: Tugor123@yandex.ru
Russian Federation, Moskow

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2. Fig. 1. Schematic representation of heat treatment cycles: a – first temperature cycle 293 → 1483 → 293 → 1183 → → 973 → 1073 → 293; b – second temperature cycle 293 → 1483 → 293 → 1143 → → 923 → 1023 → 293; c – third temperature cycle 293 → 1483 → 293 → 1183 → → 293 → 1023 → 293 → 973 → 293; – ⋅ – solvus line Ts (temperature of complete dissolution). Temperature is given in Kelvin

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3. Fig. 2. General view and microstructure of samples made of EP741NP alloy at ×2000 magnification that underwent heat treatment in different modes: a, b – first temperature cycle; c, d – second temperature cycle; e, f – third temperature cycle

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4. Fig. 3. Microstructure of EP741NP alloy samples at ×4000 magnification after heat treatment in different modes: a, c – first temperature cycle; b, d – second temperature cycle; e, f – third temperature cycle

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5. Fig. 4. Microstructure of EP741NP alloy samples at ×8000 magnification after heat treatment in different modes: a, b – first temperature cycle; c, d – second temperature cycle; e, f – third temperature cycle

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6. Fig. 5. Topology of the formed phases in the microstructure of samples made of EP741NP alloy at ×8000 magnification that underwent heat treatment in different modes: a – first temperature cycle; b – second temperature cycle; c – third temperature cycle

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