Microstructure characteristics and mechanical properties of a novel heavy density Ni–W–Co matrix alloy prepared by VIM/VAR

Zhao, Peng; Liu, Zheng; Yang, Shufeng; Liu, Wei; Li, Jingshe; Yang, Shulei; Chen, Yifan

doi:10.1016/j.jmrt.2021.05.060

Cited by 13 publications

(3 citation statements)

References 23 publications

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“…Numerical calculation can not only directly observe the formation of the solidification structure but also help to understand the formation mechanism of the solidification structure [12][13][14][15][16][17]. Domestic and foreign scholars have carried out a large number of numerical simulation studies on the solidification structure of vacuum consumable melting, including the realization of the vacuum arc remelting simulation process, the treatment of boundary conditions, the selection of a microstructure model, and so on [18][19][20][21][22][23][24]. Zhang Y et al [25] established a three-dimensional axisymmetric finite element model for the solidification process of a TC4 alloy ingot in vacuum arc remelting, simulated the temperature field distribution using the moving boundary method, and calculated the solidification structure, shrinkage, and porosity formation of the TC4 ingot in the VAR process based on the cellular automaton and finite element coupling method (CAFE method); the simulation results are in good agreement with the experimental observations in the grain structure, columnar crystal growth direction, columnar to equiaxed crystal transition, shrinkage, and porosity.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Solidification Structure in the Vacuum Arc Remelting Process of Titanium Alloy TC4 Based on 3D CAFE Method

Jing,

Liu,

Geng

et al. 2024

Processes

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Vacuum arc remelting is the main production method of titanium alloy ingots at present. In order to obtain good quality ingots, it is of great significance to study the formation of the solidification structure of ingots via vacuum arc remelting. In order to select and optimize the nucleation parameters for the solidification microstructure simulation of an ingot, a 3D CAFE model for microstructure evolution during vacuum arc remelting was established, taking into account heat transfer, flow, and solute diffusion. The Gaussian distribution continuous nucleation model and extended KGT model were used to describe the grain nucleation and dendrite tip growth rates, respectively. The multi-point mass source and moving boundary method were used to simulate the ingot growth. The results show that there are three typical crystal regions in the solidification structure of vacuum arc remelting titanium alloy ingots, namely the surface fine crystal region, columnar crystal region, and central equiaxed crystal region. The proportion of the columnar crystal region in the solidification structure of an ingot increases gradually with the increase in the undercooling of the maximum bulk nucleation. With an increase in the maximum bulk nucleation density, the equiaxed grain zone gradually increases, and the grain size gradually decreases. The proportion of the columnar crystal region in the solidification structure of an ingot increases gradually with an increase in the undercooling of the maximum bulk nucleation. The maximum volume nucleation variance has no obvious effect on the change in the solidification structure. When the maximum volume nucleation undercooling is 5.5 K, the maximum volume nucleation standard deviation is 4 K, and the maximum volume nucleation density is 5 × 108. The solidification structure simulation results are in good agreement with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Simulation of Solidification Structure in the Vacuum Arc Remelting Process of Titanium Alloy TC4 Based on 3D CAFE Method

Jing,

Liu,

Geng

et al. 2024

Processes

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“…The tensile strengths of copper and tantalum are 200 ̃360 MPa and 400 ̃500 MPa, respectively, whereas the tensile strength of high-density Ni-Co-W alloy can reach 1000 ̃1500 MPa. Compared with other alloys, the preparation technique of high-density Ni-Co-W alloy is relatively simple and can be prepared by conventional metallurgical processes [24]. Ordinary forging technology can also be used.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and texture of a novel hot-stamped high-density Ni-Co-W alloy

Xie

Zhao

et al. 2022

Mater. Res. Express

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Ni-Co-W alloy is expected to be a potential material for applications in national defense, military industry and petroleum exploration. Texture has a significant influence on alloy properties. In the present work, a 44Ni-37W-19Co alloy was prepared by vacuum melting and annealed at 1200 °C for 1h after forging, baring and hot stamping. The microstructure and texture at different positions were analyzed by optical micrographs (OM), scanning electron microscopy (SEM), x-ray diffraction (XRD) and electron backscattering diffraction (EBSD) technique. The alloy presents equiaxial grains with an average size of ~90 μm and a nearly random texture. All the average pole intensity levels at surface, sub-surface and center are ~2. The anisotropy degree along the circumferential direction is less than that along the normal direction. The maximum and minimum differences of the radial pole intensity are 0.44 and 0.04, respectively. It is expected that this work will contribute to the controllable effects of microstructure and texture to improve the properties of hot-stamped high-density Ni-Co-W alloys.

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“…The segregation of alloying element and the inclusions of non-metallic elements are detrimental to the properties of alloy produced. Such defects led to crack initiation in the as-cast Ni-W-Co matrix alloy developed via vacuum induction melting (Zhao et al , 2021). Most researchers (Shu et al , 2018; Tang et al , 2019; Shu et al , 2017; Lv et al , 2015; Pröbstle et al , 2016; Qin et al , 2017; Antonov et al , 2017; Kear and Pope, 1989; Babalola et al , 2020b) have reported on the corrosion, oxidation and phase strengthening effect of these refractory elements in nickel-based superalloys.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and tribological studies of sintered nickel-based ternary alloys

Babalola

Akinribide

Akinwamide

et al. 2021

WJE

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Purpose During the operation of nickel-based alloys as blades and discs in turbines, the sliding activity between metallic surfaces is subjected to structural and compositional changes. In as much as friction and wear are influenced by interacting surfaces, it is necessary to investigate these effects. This study aims to understand better the mechanical and tribological characteristics of Ni-17Cr-10X (X = Mo, W, Ta) ternary alloy systems developed via spark plasma sintering (SPS) technique. Design/methodology/approach Nickel-based ternary alloys were fabricated via SPS technique at 50 MPa, 1100 °C, 100 °C/min and a dwell time of 10 mins. Scanning electron microscopy, X-Ray diffraction, energy dispersive X-ray spectroscopy, nanoindentation techniques and tribometer were used to assess the microstructure, phase composition, elemental dispersion, mechanical and tribological characteristics of the sintered nickel-based alloys. Findings The outcome of the investigation showed that the Ni-17Cr10Mo alloy exhibited the highest indentation hardness value of 8045 MPa, elastic modulus value of 386 GPa and wear resistance. At the same time, Ni-17Cr10W possessed the least mechanical and wear properties. Originality/value It can be shown that the SPS technique is efficient in the development of nickel-based alloys with good elemental distribution and without defects such as segregation of alloying elements, non-metallic inclusions. This is evident from the scanning electron microscopy micrographs.

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Microstructure characteristics and mechanical properties of a novel heavy density Ni–W–Co matrix alloy prepared by VIM/VAR

Cited by 13 publications

References 23 publications

Simulation of Solidification Structure in the Vacuum Arc Remelting Process of Titanium Alloy TC4 Based on 3D CAFE Method

Simulation of Solidification Structure in the Vacuum Arc Remelting Process of Titanium Alloy TC4 Based on 3D CAFE Method

Microstructure and texture of a novel hot-stamped high-density Ni-Co-W alloy

Mechanical and tribological studies of sintered nickel-based ternary alloys

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