آخرین محصولات
Crystal Plasticity Simulation of the Microstructural …
The microstructural effect, including γ' precipitate morphology and twin grains, of dwell fatigue behavior in a powder metallurgy nickel-based superalloy, was studied using crystal plasticity modeling. Strain …
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Metals | Free Full-Text | Influence of Powder Surface
The aim of this study was to gain a deep understanding of the microstructure-mechanical relationship between solid-state sintering and full-melting processes. The IN718 superalloy was fabricated by hot isostatic pressing (HIP) and selective laser melting (SLM). Continuous precipitates were clearly localized along the prior particle boundary (PPB) in …
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Hot oscillatory pressure preparing low-cost FGH4096 superalloys …
Two powder superalloys were prepared with FGH4096 powder in average particle size 51 μm and 120 μm by argon atomization method. The chemical compositions of the powder alloys (wt. %) is 0.03% C, 15.8% Cr, 13% Co, 4.1 % W, 2.3% Al, 3.8% Ti, 4.3% Mo, 0.8.% ... The nano-Al/NiO energetic film with a high contact angle (CA) of 166° …
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Characterization of MCrAlY/nano-Al2O3 nanocomposite powder …
Al2O3 nanoparticles and MCrAlY/nano-Al2O3 nanocomposite powder (M = Ni, Co, or NiCo) were produced using high-energy ball milling. The MCrAlY/nano-Al2O3 coating was deposited by selecting an optimum nanocomposite powder as feedstock for high-velocity oxygen fuel thermal spraying. The morphological and microstructural …
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A comprehensive literature review on laser powder bed fusion of …
Maps linking each reviewed publication and its research focus are provided. Inconel superalloys are one of the main classes of materials with good potential for production using the additive manufacturing process of laser powder bed fusion (PBF-LB), which has a broad range of applications in the transportation and energy sectors.
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Efficient production of a high-performance dispersion
This new processing technique employed resonant acoustic mixing to coat an equiatomic NiCoCr powder with nano-scale yttrium oxides. Then, through laser powder …
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Fatigue crack growth mechanisms in powder metallurgy Ni-based
Powder metallurgy (PM) Ni-based superalloys are widely used for aeroengine turbine disc applications due to their excellent mechanical properties and good corrosion resistance at elevated temperatures. ... nano-grains with the size of 100–200 nm were formed in front of the crack tip and these misoriented nano-grains led to the …
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(PDF) Nanocrystalline Ni 3 Al-type intermetallic phase powder …
INSTITUTE OF PHYSICS PUBLISHING NANOTECHNOLOGY Nanotechnology 15 (2004) 648–657 PII: S0957-4484(04)73655-7 Nanocrystalline Ni3Al-type intermetallic phase powder from Ni-base superalloys D Mukherji1, R Müller2, R Gilles3, P Strunz4, J Rösler5 and G Kostorz1 1 ETH Zurich, Institute of Applied Physics, CH-8093 Zurich, …
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Fabrication and casting simulation of composite ceramic …
It was concluded that, the ceramic cores with 0.6 wt% of nano-silica powders showed superior properties including linear shrinkage of 0.6%, apparent …
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Nanoprecipitate-Strengthened High-Entropy Alloys
[156, 157] In Ni-based superalloys, the γ′ (Ni 3 Nb)-strengthening phase contributes much more to the strength than the γ′ …
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Microstructure and defects in a Ni-Cr-Al-Ti γ/γ' model superalloy
No chemical differences are observed between cracked and non-cracked boundaries. Trace amounts of oxygen contained in the powder lead to Al 2 O 3 slag formation, as well as nano oxide dispersoid incorporation. Sulfur, a critical contaminant in superalloys, is detected but rendered harmless by the formation of TiS nanoprecipitates.
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Nano-twinning in a γ′ precipitate strengthened Ni-based superalloy
Deformation twinning was identified as a dominant mechanism in Ni-based superalloys during low strain rate creep and tension at a wide range of temperatures, 650–760°C [ 8–10 ], which imparts the nano-twins on the order of several to tens of atomic layers. The properties at elevated temperatures are believed to arise from the resistance …
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NiTi superalloys
By mixing micro- or nano-range small-sized powder particles, the homogeneity of the powder mixture obtained is better than that of a liquid metallurgy …
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Creep behaviors of fine-grained Ni-base powder metallurgy superalloys
Three Ni-base powder metallurgy superalloys have been developed recently, and tensile tests at temperatures ranging from room temperature (RT) to 815 °C were conducted on them. ... from nano to ...
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Metal Nanopowders
Metal Nanopowders - an inventor of technology for metal nanopowders, alloys and chemical compounds (metal oxides and nitrides) production by the electric explosion of …
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Superalloys
1.3.5 Superalloys. Superalloys are a group of nickel, iron–nickel and cobalt alloys used in jet engines. These metals have excellent heat resistant properties and retain their stiffness, strength, toughness and dimensional stability at temperatures much higher than the other aerospace structural materials.
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Effect of Solution Treatment on Microstructure Evolution of a Powder
FGH4096 is a γ′ precipitation strengthening nickel-based powder superalloy, which is representative of the second-generation nickel-based powder superalloys in China. FGH4096 alloy can serve up to 750 °C. It has excellent comprehensive properties such as high temperature resistance, high strength and toughness, and low crack growth …
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Additive manufacturing of Ni-based superalloys: …
Ni-based superalloys are the most extensively investigated superalloys in the AM field and have become the materials of choice for fabricating components …
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Effect of cobalt on γ′ coarsening behavior of Ni-base powder …
Wang et al. investigated the effect of Co on γ′ coarsening in single crystal superalloys with/without Re at 950 °C and 1050 °C [25]. They have found that the addition of Co could accelerate the coarsening rate of γ′ in both Re-containing and Re-free superalloys. However, Shi et al. found the addition of Co could slow down the …
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Superalloys 2012 : proceedings of the 12th
It covers all aspects of the development, production, behavior and integration of superalloys, and related high temperature materials, into gas turbines for aircraft, power generation and other applications as well as cast, wrought and powder superalloys, and associated coating systems. (source: Nielsen Book Data)
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NanoAL
Our novel aluminum alloys have optimized chemistries and thermally-stable nanostructures, achieving unprecedented mechanical properties up to 400ºC. These heat-treatable alloys …
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Thermal Barrier Coatings (TBCs): Materials, Manufacturing Methods…
The outermost layer of the TBC is the top coat.This is a porous oxide.Since it's porous, it has very low conductivity and can survive stresses caused by changes in thermal expansion. This layer primarily insulates the alloy from high temperatures.. The innermost layer of the TBC, touching the superalloy, is the bond coat.This layer is for oxidation resistance, and …
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Additive manufacturing of Ni-based superalloys: Residual stress
Superalloys have been fabricated by almost all of the metal AM processes. However, compared with indirect and solid-state AM processes (e.g., binder jetting), powder fusion-based AM processes (e.g., powder bed fusion ... Nano-indentation tests show that these oxides are significantly harder than the γ matrix, suggesting that they cause ...
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Additive Manufacturing of Nickel Superalloys: Opportunities …
Laser powder bed fusion AM of nickel superalloys is conducted in a protective chamber with dynamic argon flow to avoid oxidation or gas dissolution. To melt specific locations, a laser beam is scanned on top of the powder bed with different focal sizes and power. The absorption of laser beam leads to melting of the powder
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On the variety and formation sequence of second-phase particles …
The as-built microstructure of nickel-based superalloys contains a large variety of nano-particles with complex internal structures. ... The general findings of this work are expected to be shared by several nickel-based superalloys processed by laser powder bed fusion since the intermetallic particles identified in this alloy contain …
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Nanomaterials: a review of synthesis methods, properties, recent
Nanomaterials have emerged as an amazing class of materials that consists of a broad spectrum of examples with at least one dimension in the range of 1 to 100 nm. Exceptionally high surface areas can be achieved through the rational design of nanomaterials. Nanomaterials can be produced with outstanding magn
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Effect of heat treatment on mechanical property and microstructure of …
Powder metallurgy nickel-based superalloys are widely used as turbine disc materials in aircraft engines and power generation turbines because of their excellent properties at elevated temperatures [1,2]. These alloys typically are composed of a face-centered cubic matrix (γ) and a L1 2 structure precipitate (γ′) embedded in γ matrix [3 ...
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Progress in application of rare metals in superalloys
Re, which mainly distributes in the γ matrix, forms short-range order atom cluster on nano scale. Those clusters reduce diffusivity of the alloy elements and effectively inhibit motion of the dislocation. ... Since the 1970s, the effect of Hf in the powder superalloys has been investigated. Some countries such as America, Russia, England, …
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Open Access proceedings Journal of Physics: Conference …
wastage. M C Somani et al [6] have developed IN 100 superalloy by powder metallurgy technique and studied the hot deformation behaviour in the temperature range of 1000-12000 C and strain rate range 0.0003–10 s-1 and developed the processing map. 3. Methodology 3.1 Powder metallurgy route for making nickel based superalloys use in …
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Y2O3 nanoparticles decorated IN738LC superalloy
Y2O3 nanoparticles decorated IN738LC superalloy manufactured by laser powder bed fusion: Cracking inhibition, microstructures and mechanical properties - …
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