The structure and properties of pre-alloyed NiAl-Cr(Co,Hf) spherical powders produced by plasma rotating electrode processing for additive manufacturing

Kaplanskii, Yu. Yu.; Зайцев, А. А.; Sentyurina, Zh. A.; Левашов, Е. А.; Pogozhev, Yu. S.; Логинов, П.А.; Logachev, I. A.

doi:10.1016/j.jmrt.2018.01.003

Cited by 28 publications

(11 citation statements)

References 35 publications

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“…The intergrain space of the Zr-doped alloy (Figure 6) was found to contain zone segregations of Ni5Zr. The characteristic size of the structural components and the principle of microstructure formation are similar to those for the developed Hf-doped CompoNiAl-M5-3 alloy [23][24][25][26]. It can be assumed that this microheterogeneous structure will not cause deterioration of mechanical properties.…”

Section: Resultsmentioning

confidence: 79%

“…The increase in the unit cell parameter of the matrix phase was presumably caused by dissolution of molybdenum, chromium, and cobalt atoms in this phase as proved by the results of EDXS analysis of the The BF TEM image of the structure of the annealed NiAl-15Mo-1 taken along the [1 11] (Ni,Co,Cr)3Mo3C zone axis is shown in Figure 18a. An diffusion-controlled growth of strengthening Cr(Mo) nanoprecipitates a grain boundaries up to the submicron size (150-400 nm) and increased cobalt concentrations in the (Ni,Co,Cr)3Mo3C phase (Table 11, spectrum 6 references [24,26,31,44], precipitation of dispersed particles of the excessiv took place at the stage when the ingots were cooled down in the vacuum electric furnace as a result of concentration stratification of supersaturated Cr(Mo) in the intermetallic matrix. Changes in the composition of interden ers are caused by its diffusion saturation with doping elements as dispe (Cr,Mo) are dissolved in β-NiAl during the heat treatment of the alloy.…”

Section: Resultsmentioning

confidence: 99%

“…Annealing caused diffusion-controlled growth of strengthening Cr(Mo) nanoprecipitates along the intergrain boundaries up to the submicron size (150-400 nm) and increased chromium and cobalt concentrations in the (Ni,Co,Cr) 3 Mo 3 C phase (Table 11, spectrum 6). According to references [24,26,31,44], precipitation of dispersed particles of the excessive Cr(Mo) phase took place at the stage when the ingots were cooled down in the vacuum chamber of the electric furnace as a result of concentration stratification of supersaturated solid solution Cr(Mo) in the intermetallic matrix. Changes in the composition of interdendritic interlayers are caused by its diffusion saturation with doping elements as dispersed inclusions (Cr,Mo) are dissolved in β-NiAl during the heat treatment of the alloy.…”

Section: Resultsmentioning

confidence: 99%

“…High-temperature creep tests revealed that the working temperature increased by 80-85 • C and the creep activation energy was elevated due to HIP treatment of the as-SLM products. Therefore, HIP (and lowtemperature aging in some cases) are important operations for the SLM products made of NiAl-based alloys [26,27,31,32].…”

Section: Introductionmentioning

confidence: 99%

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Structure and Properties of Heat-Resistant Alloys NiAl–Cr–Co–X (X = La, Mo, Zr, Ta, Re) and Fabrication of Powders for Additive Manufacturing

et al. 2021

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The NiAl–Cr–Co–X alloys were produced by centrifugal self-propagating high-temperature synthesis (SHS) casting. The effects of dopants X = La, Mo, Zr, Ta, and Re on combustion, as well as the phase composition, structure, and properties of the resulting cast alloys, have been studied. The greatest improvement in overall properties was achieved when the alloys were co-doped with 15% Mo and 1.5% Re. By forming a ductile matrix, molybdenum enhanced strength characteristics up to the values σucs = 1604 ± 80 MPa, σys = 1520 ± 80 MPa, and εpd = 0.79%, while annealing at T = 1250 ℃ and t = 180 min improved strength characteristics to the following level: σucs = 1800 ± 80 MPa, σys = 1670 ± 80 MPa, and εpd = 1.58%. Rhenium modified the structure of the alloy and further improved its properties. The mechanical properties of the NiAl, ZrNi5, Ni0.92Ta0.08, (Al,Ta)Ni3, and Al(Re,Ni)3 phases were determined by nanoindentation. The three-level hierarchical structure of the NiAl–Cr–Co+15%Mo alloy was identified. The optimal plasma treatment regime was identified, and narrow-fraction powders (fraction 8–27 µm) characterized by 95% degree of spheroidization and the content of nanosized fraction <5% were obtained.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structure and Properties of Heat-Resistant Alloys NiAl–Cr–Co–X (X = La, Mo, Zr, Ta, Re) and Fabrication of Powders for Additive Manufacturing

et al. 2021

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“…Currently, most popular are the methods of melt atomization by a gas or water jet [7,8] and plasma rotating electrode process. [9][10][11] Water-atomized powders often have irregular shape since high cooling rates suppress the action surface tension forces during droplet spheroidization. Application of inert gas instead of water allows one not only to make powders more spherical but also to widen the nomenclature of produced powders.…”

Section: Introductionmentioning

confidence: 99%

Production of Rounded Reactive Composite Ti/Al Powders for Selective Laser Melting by High-Energy Ball Milling

Непапушев

Moskovskikh

Suvorova

et al. 2019

Metall Mater Trans B

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The effect of different regimes of high-energy ball milling (HEBM) on the morphology of reactive Ti-Al powders was studied. It is shown that a ''soft'' regime of mechanical treatment can be readily used to prepare spheroidal reactive Ti-Al powders with the flow ability suitable for selective laser melting applications. Size distribution of milled powders was found to depend on the diameter of milling balls. Milled powders showed good flow ability of 61.7 and 81.25 s for 2-mm and 6-mm balls, respectively. Combustion reaction in the compacts prepared from milled powders got started at temperatures close to the melting point of Al, and due to the thermal effect of reaction, the temperature jump made a value of about 500°C. The combustion product-Ti-TiAl 3 composite-can be recommended for use as a high-temperature structural material.

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Using Selective Electron Beam Melting to Enhance the High‐Temperature Strength and Creep Resistance of NiAl–28Cr–6Mo In Situ Composites

Förner,

Vollhüter,

Krapf

et al. 2023

Adv Eng Mater

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By increasing the density of interfaces in NiAl–CrMo in situ composites, the mechanical properties can be significantly improved compared to conventionally cast material. The refined microstructure is achieved by manufacturing through electron beam powder bed fusion (PBF‐EB). By varying the process parameters, an equiaxed or columnar cell morphology can be obtained, exhibiting a plate‐like or an interconnected network of the (Cr,Mo) reinforcement phase which is embedded in a NiAl matrix. The microstructure of the different cell morphologies is investigated in detail using scanning electron microscope, transmission electron microscopy, and atom probe tomography. For both morphologies, the mechanical properties at elevated temperatures are analyzed by compression and creep experiments parallel and perpendicular to the building direction. In comparison to cast NiAl and NiAl–(Cr, Mo), the yield strength of the PBF‐EB fabricated specimens is significantly improved at temperatures up to 1,027 °C. While the columnar morphology exhibits the best improved mechanical properties at high temperatures, the equiaxial morphology shows nearly ideal isotropic mechanical behavior, which is a substantial advantage over directionally solidified material.

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The structure and properties of pre-alloyed NiAl-Cr(Co,Hf) spherical powders produced by plasma rotating electrode processing for additive manufacturing

Cited by 28 publications

References 35 publications

Structure and Properties of Heat-Resistant Alloys NiAl–Cr–Co–X (X = La, Mo, Zr, Ta, Re) and Fabrication of Powders for Additive Manufacturing

Structure and Properties of Heat-Resistant Alloys NiAl–Cr–Co–X (X = La, Mo, Zr, Ta, Re) and Fabrication of Powders for Additive Manufacturing

Production of Rounded Reactive Composite Ti/Al Powders for Selective Laser Melting by High-Energy Ball Milling

Using Selective Electron Beam Melting to Enhance the High‐Temperature Strength and Creep Resistance of NiAl–28Cr–6Mo In Situ Composites

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