Experiments and simulations of directionally annealed ODS MA 754

Baker, I.; Iliescu, B.; Li, J.; Frost, H. Robert

doi:10.1016/j.msea.2008.03.032

Cited by 27 publications

(25 citation statements)

References 39 publications

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“…Mechanical alloying (MA) is an effective method for producing oxide dispersion strengthened (ODS) alloys [5]. ODS Ni-based superalloys are widely used in industrial gas turbines and spacecraft [6][7][8]. In producing ODS Ni-based superalloys, oxide particles such as Y 2 O 3 , Al 2 O 3 , and ThO 2 are added to the nickel matrix [4].…”

Section: Introductionmentioning

confidence: 99%

The effect of the amount of Y2O3 doped to the MA6000 alloy produced by mechanical alloying method on wear behavior

Çelik

Özyürek

Tunçay

2022

J min metall B Metall

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This paper investigated the wear performances of Y2O3 doped MA6000 (Ni-Cr-Al) alloy produced by mechanical alloying (MA). Produced, all powders were pre-formed by cold pressing and sintered in a vacuum environment. Sintered MA6000-X% Y2O3 superalloys were characterized by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) analysis, density, and hardness measurements. Wear tests of Y2O3 added MA6000 alloys were carried out in a block-on-ring type wear device. In the wear tests, the sliding speed of 1 ms-1 at room temperature (RT) was performed under five different sliding distances (200-1000m) and three different loads (5 N, 10 N, and 15 N). As a result of the studies, it was determined that the MA?ed MA6000 superalloy powders were homogeneous and flake shape. With the increase amount of Y2O3, hardness of these superalloys increased from 267 to 431 Hv, but the density slightly decreased. Different intermetallic/carbur phases such as Ni3Al, MoC are observed in all compositions. Wear tests show that weight loss and wear rate decreased, and friction coefficient (?) increased with the increasing amount of Y2O3 additive. Besides, it was determined that as the applied load increased in the wear test, the weight loss increased, but the wear rate and friction coefficient (?) decreased.

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Section: Introductionmentioning

confidence: 99%

The effect of the amount of Y2O3 doped to the MA6000 alloy produced by mechanical alloying method on wear behavior

Çelik

Özyürek

Tunçay

2022

J min metall B Metall

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“…Subsequently, the hot extrusion of mechanical alloyed powders is conducted to form a consolidated ODS superalloy bar with a fine primary recrystallized microstructure. Then, the directionally recrystallized microstructure with large millimeter-scale elongated grains is achieved by a specific high-temperature directional annealing known as "zone annealing," [16,17] with a final appropriate aging treatment to precipitate γ 0 phase. During each step of processing, the microstructure of the superalloy changes considerably in respect of grain size, deformation, oxide particle dispersion, γ 0 distribution, etc.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Processing Conditions on the γ′ Morphology of an Oxide Dispersion Strengthened Ni‐Based Superalloy

et al. 2020

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Herein, the evolution of the microstructure of a newly developed oxide dispersion strengthened (ODS) Ni‐based superalloy with emphasis on γ′ morphology during different processing conditions is investigated. X‐ray analysis of severely deformed mechanically alloyed (MAed) powders shows that the as‐milled nano‐sized crystallite size increases with annealing associated with the sharp drop of dislocation density. At the same time, by annealing MAed powders γ′ precipitates above 300 °C, and depending on the aging treatment regime, Vickers microhardness changes mainly due to γ′ distribution and dislocation release. The thorough evaluation of γ′ morphology in the microscale shows that in contrast to the spherical shape of γ′, after heat treatment of solutionized MAed ODS superalloy, irregular‐shaped γ′ exist in the MAed ODS superalloy due to severe plastic deformation during mechanical alloying. However, a unique nanostructured lamellar morphology forms in the γ′ precipitates with different lamellae directions. This structure is stable in all subsequent processing steps with γ′ lamellae of (011true¯) planes and intervals of 20–30 nm. The scanning transmission electron microscopy (STEM)–high‐angle annular dark‐field (HAADF) composition analysis clarifies that the nanostructured lamellar morphology shows no partitioning of alloying elements, and its origin may be attributed to the formation of antiphase domain boundaries.

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“…The lower processing temperatures required for directional recrystallisation allow easier processing of high melting point materials such as tungsten [5,6]; . It is likely that minimal solute redistribution will occur, allowing single crystals or columnar grain structures to be produced from non-castable alloys, such as advanced nickel-based superalloys [7][8][9][10][11]13,[15][16][17][18][19][20][23][24][25][27][28][29][30][31]43,46,50,51], and avoiding the homogenisation anneals that are required to remove the interdendritic segregation that occurs in single crystals of nickel-based superalloys grown by directional solidification, again potentially producing cost savings; . Complex net-shaped (but not re-entrant geometry) structures can, in principle, be processed, producing cost savings compared to directional solidification by avoiding the need for costly moulds and cores [13,66,75], see, for example, the hollow turbine blade with cooling holes shown in Figure 2 [75]; .…”

Section: Introductionmentioning

confidence: 99%

Directional recrystallisation processing: a review

Yang

Baker

2020

International Materials Reviews

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Directional recrystallisation processing is a solid-state process in which a specimen traverses a sharp hot zone and one or a few grains grow as they pass through the hot zone. The mechanism can be either a primary recrystallisation or secondary recrystallisation process, or a combination of both. The mechanism can be either primary recrystallisation or secondary recrystallisation process, or a combination of both. Directional recrystallisation was invented more than 80 years ago to achieve columnar grain structures or single crystals that have enhanced mechanical properties. This review discusses the effects of both processing parameters, including the temperature gradient, hot-zone velocity, and annealing temperature, and microstructural parameters, including stored energy, grain size, initial texture, solutes, and both soluble and insoluble particles, on the resulting microstructures. The results of simulations of directional recrystallisation, including Monte Carlo simulations, Front-Tracking methods, and phase-field simulations, are also reviewed. Finally, the effects of directional recrystallisation on material properties are discussed.

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Experiments and simulations of directionally annealed ODS MA 754

Cited by 27 publications

References 39 publications

The effect of the amount of Y2O3 doped to the MA6000 alloy produced by mechanical alloying method on wear behavior

The effect of the amount of Y2O3 doped to the MA6000 alloy produced by mechanical alloying method on wear behavior

Evaluation of Processing Conditions on the γ′ Morphology of an Oxide Dispersion Strengthened Ni‐Based Superalloy

Directional recrystallisation processing: a review

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