Primary microstructure characterization of Co-20Ni-9Al-7W-3Re-2ti superalloy

Tomaszewska, A.

doi:10.2298/jmmb210309044t

Cited by 2 publications

(1 citation statement)

References 40 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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Induction vacuum smelting of Co-Al-W superalloys - optimizing the feedstock based on the alloy's chemical composition, elemental segregation, and slag formation

Mikuszewski

Tomaszewska

Moskal

et al. 2022

J min metall B Metall

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In this study, the manufacturing of Co-Al-W alloys by smelting in an vacuum induction furnace is discussed taking into account the optimizing of the feedstock material morphology. Herein, the influence of various feedstock conditions and the order of introducing the alloying elements into a liquid alloy are analyzed and described. The investigation revealed that it is possible to obtain the desired chemical composition of Co-Al-W alloys using fragmented tungsten pellets introduced from a vacuum feeder into the liquid Co-Al alloy heated above the liquidus temperature by maximum of 40-50?C. This technical variant requires accurate temperature control of the molten alloy, which does not ensure complete reproducibility. The disadvantage of this process lies in the relatively high slag formation. The optimal technical solution involves obtaining the liquid Co-W solution and introducing Al at the end of the smelting process; in this variant, the slagging effect is relatively low. Additionally, melting of the alloy in an argon atmosphere reduces the loss of aluminum due to evaporation, as compared to melting in a vacuum. The smelting process can be carried out either in Al2O3 solid crucibles or in compacted crucibles made of MgO-based refractory mass.

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Primary microstructure characterization of Co-20Ni-9Al-7W-3Re-2ti superalloy

Cited by 2 publications

References 40 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

Induction vacuum smelting of Co-Al-W superalloys - optimizing the feedstock based on the alloy's chemical composition, elemental segregation, and slag formation

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