scholarly journals Microstructural Characteristics in Babbitt Coatings Deposited by LPCS

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 689
Author(s):  
Wolfgang Tillmann ◽  
Leif Hagen ◽  
Mohamed Abdulgader ◽  
Mark Dennis Kensy ◽  
Michael Paulus
Keyword(s):  
Solid Solution ◽  
Substrate Temperature ◽  
Thermal Spraying ◽  
Cold Spraying ◽  
Maximum Load ◽  
Gas Temperature ◽  
Microstructural Characteristics ◽  
Mesoscopic Structure ◽  
Solid Solution Matrix ◽  
Solution Matrix

Studies have already established that the mechanical properties of Babbitt coatings significantly depend on the microstructural characteristics, such as the amount and distribution of intermetallic compounds dispersed in a soft solid solution matrix. For Sn–Sb–Cu-based Babbitt coatings, the formation of SbSn- and CuSn-based precipitates has a substantial influence on the resulting microhardness and thus determines the maximum load carrying capacity. Thermal spraying of Sn-based Babbitt coatings results in a relatively more refined structure of these precipitates than in common manufacturing processes, such as casting, due to the thermal processing conditions. This study aims to evaluate the effect of the temperature of the propellant gas and substrate temperature on the microstructural characteristics of Sn–Sb–Cu-based Babbitt coatings deposited by low pressure cold spraying (LPCS). The deposits were examined for their phase composition, microhardness and mesoscopic structure. It was found that the coatings were mainly composed of Sb2Sn23, Sb0.49Sn0.51 and Sorosite (CuSn or CuSb0.115Sn0.835), regardless of the substrate temperature or temperature of the propellant gas to be investigated. For a gas temperature above 300 °C, an increased microhardness was observed, which correlates with the appearance of a more homogenous distribution of Sb0.49Sn0.51 dispersed in a soft Sn-rich solid solution matrix.

Microstructures and Mechanical Properties of Consolidated Mg-Zn-Y Alloy

2007 ◽  
Vol 534-536 ◽  
pp. 833-836 ◽  
Author(s):  
J.K. Lee ◽  
Taek Soo Kim ◽  
Ha Guk Jeong ◽  
Jung Chan Bae
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Solid Solution Matrix ◽  
Solution Matrix ◽  
Consolidation Temperature

The microstructure and mechanical properties of the Mg97Zn1Y2 alloy prepared by spark plasma sintering of gas atomized powders have been investigated. After consolidation, precipitates were observed to form in the α-Mg solid solution matrix of the Mg97Zn1Y2 alloy. These precipitates consisted of Mg12YZn and Mg24Y5 phases. The density of the consolidated bulk Mg-Zn-Y alloy was 1.86 g/cm3. The ultimate tensile strength and elongation were dependent on the consolidation temperature, which were in the ranges of 280 to 293 MPa and 8.5 to 20.8 %, respectively.

Microstructure and Strengthening Mechanism of Natural Aging of TZS88 Aluminum Alloy

2012 ◽  
Vol 476-478 ◽  
pp. 59-64
Author(s):  
Chong Cai Zhang ◽  
Yong Fei Yang ◽  
Wei Xing Wu ◽  
Long Wang
Keyword(s):  
Solid Solution ◽  
Aluminum Alloy ◽  
Natural Aging ◽  
Strengthening Mechanism ◽  
Dispersion Strengthening ◽  
Solid Solution Strengthening ◽  
Solution Strengthening ◽  
Solid Solution Matrix ◽  
Solution Matrix ◽  
Scanning Electron

In this paper, TZS88 aluminum alloy mechanical properties of three months of natural aging is tested, the microstructure and the strengthening mechanism is studied by the application of optical metallographic microscope and scanning electron microscopy. The results show that TZS88 aluminum reinforced mainly caused by solid solution strengthening, aging strengthening and dispersion strengthening, and as such its tensile strength, hardness and elongation in the natural aging have reached ZQSn6-6-3 bronze level, the microstructure are compounds which included α(Al) solid solution matrix + Sn + s, θ, T, ε etc.

Ni-Based Alloy Coating on Plain-Carbon Steel by Hot Dipping Process

2011 ◽  
Vol 361-363 ◽  
pp. 609-614
Author(s):  
Tao Lin ◽  
Li Sheng Wang ◽  
Zhi Shan Gao ◽  
Zhi Meng Guo
Keyword(s):  
Solid Solution ◽  
Steel Substrate ◽  
Alloy Coating ◽  
Plain Carbon Steel ◽  
Columnar Dendrite ◽  
Light Band ◽  
Coating Microstructure ◽  
Dipping Process ◽  
Solid Solution Matrix ◽  
Solution Matrix

A layer of Ni-Cr-Si-B-Fe alloy was successfully coated on plain steel substrate by hot dipping process. The Ni-Cr-Si-B-Fe alloy coating has a homogeneous thickness of 3mm. The chemical composition and microstructure were studied with SEM and XRD in this paper. The result shows that the Ni-Cr-Si-B-Fe alloy coating is defect-free and chemical bonded with plain steel substrate. A light band zone of 8-10 m width is between Ni-Cr-Si-B-Fe alloy coating and plain steel substrate, and may be considered as a quickly solidified layer. The coating microstructure is a heterogeneous microstructure and changes from the light band zone to the surface of the coating, which is composed mainly of coarse columnar dendrite, needle-like precipitates and scattered eutectic structures. Four regions across the thickness of Ni brazing alloy coating, due to solidification conditions upon hot-dipping, have been identified with distinguished microstructure. In γ-(Fe, Ni) solid solution matrix, the hard phases of CrB, Fe2B and Cr23C6 is identified in the coating.

The Microstructural Peculiarities of Beryllium Bronze after Heat Treatment

2020 ◽  
Vol 989 ◽  
pp. 172-176
Author(s):  
V.R. Baraz ◽  
S.X. Estemirova ◽  
E.A. Ishina
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Supersaturated Solid Solution ◽  
Strength Properties ◽  
Micro Hardness ◽  
Beryllium Bronze ◽  
Phase Type ◽  
Solid Solution Matrix ◽  
Χ Phase ◽  
Solution Matrix

In this article, the microstructural peculiarities and properties of dispersion-hardened beryllium bronze with Ni and Ti are studied after quenching (780 °C) in a supersaturated solid solution and aging (320 °C, 3h). Decomposition of the α-solid solution matrix is implemented by means of an intermittent reaction with a primary allocation intermetallic χ-phase (type Be12Ti) with a VCT-lattice. It is shown that the strength properties (yield strength, micro-hardness) of the alloy more than double after aging.

Growth and spectroscopy of Gd3Ga3Al2O12 (GGAG) and evidence of multisite positions of Sm3+ ions in solid solution matrix

2016 ◽  
Vol 689 ◽  
pp. 359-365 ◽  
Author(s):  
Piotr Solarz ◽  
Michał Głowacki ◽  
Marek Berkowski ◽  
Witold Ryba-Romanowski
Keyword(s):  
Solid Solution ◽  
Solid Solution Matrix ◽  
Solution Matrix

Characteristics of Ni- Cr Binary Alloys Produced by Conventional Powder Metallurgy

2020 ◽  
Vol 835 ◽  
pp. 214-222
Author(s):  
Lamiaa Z. Mohamed ◽  
Omayma A. El Kady ◽  
Mohamed. M. Lotfy ◽  
Hafiz A. Ahmed ◽  
Fawzi A. Elrefaie
Keyword(s):  
Solid Solution ◽  
Powder Metallurgy ◽  
Energy Dispersive Analysis ◽  
X Ray ◽  
Cr Content ◽  
Matrix Microstructure ◽  
The Matrix ◽  
Solid Solution Matrix ◽  
Equiaxed Grains ◽  
Solution Matrix

The characteristics of Ni-Cr porous alloys containing 0.5 wt%Cr up to 12 wt%Cr were determined. The alloys were prepared from a mix of Ni-particles with filamentary shape and Cr-particles with irregular shape which then mixed with 0.5 wt% paraffin wax as a binder. The samples were formed by compaction and then sintered at 1200 °C for 1 h. The microstructure of samples was found to consist of a Ni-Cr solid solution matrix with X-ray energy dispersive analysis of Cr% less than 0.33 wt%. The matrix microstructure which composed of equiaxed grains (20-60 μm) surrounded high Cr content islands which also contained γ phase (Ni2.88 Cr1.22). The apparent density of the alloys was found to decrease with Cr content from 8.32 g/cm3 for samples containing 0.5 wt%Cr to 7.26 g/cm3 for samples containing 12 wt%Cr. Therefore, the estimated porosity was found to increase from 6.4% to 16.6% with increasing Cr content from 0.5 wt% to 12 wt%. The microhardness of the samples varied from 153.6 to 284.2 VHN for the equiaxed grains and from 119.6 to 240.6 VHN for the island areas.

Effect of Substrate Temperature on Microstructural Characteristics of Thermal Sprayed Superalloys

2011 ◽  
Vol 495 ◽  
pp. 13-17
Author(s):  
Fardad Azarmi ◽  
Ghodrat Karami
Keyword(s):  
Substrate Temperature ◽  
Plasma Spraying ◽  
Steel Substrate ◽  
Substrate Surface ◽  
Thermal Spraying ◽  
Air Plasma ◽  
Microstructural Characteristics ◽  
Splat Formation ◽  
Vacuum Plasma Spraying ◽  
Porosity Level

Recently, there has been a huge interest in application of thermal spraying processes to apply a protective layer on the surface of engineering components. Thermal spraying as a near net shape forming technique has also found applications in manufacturing of advanced engineering components. Spraying methods such as High Velocity Oxygen Fuel (HVOF), Vacuum Plasma Spraying (VPS), and Air Plasma Spraying (APS) are among the most commonly used deposition techniques. Coatings are built up from impact of molten particles on the substrate surface and their flattening and solidification (splat formation). Deposition of millions of individual splats connected to each other at different layers will result in a lamellae type structure. This is a typical example of an anisotropic microstructure. The microstructural features such as porosity, oxide layers define the physical and mechanical properties of coating material. This study investigates the influence of substrate temperature on microstructural characteristics of APS deposited superalloy 625 on steel substrate. The coatings were deposited on substrates at different temperatures. The porosity level was measured using prosimetry. Both image analysis technique and Electron Probe Microanalysis (EPMA) was used to measure the amount of oxide phase. The results indicated that lower substrate temperature results in lower oxide in microstructure. There has been no significant change in porosity level due to substrate temperature.

Phase equilibrium between bcc solid solution matrix and B2 aluminides in Nb-based alloy

2015 ◽  
Vol 1760 ◽  
Author(s):  
Takuya Yamanouchi ◽  
Seiji Miura
Keyword(s):  
Solid Solution ◽  
Phase Equilibrium ◽  
Phase Field ◽  
Composition Range ◽  
Basic Information ◽  
Two Phase ◽  
Nial Phase ◽  
Solid Solution Matrix ◽  
Solution Matrix

ABSTRACTB2 aluminides have a role of Al reservoir for Al2O3 surface and it is expected to increase oxidation resistance of (Nb,Mo)-bccss substrate. For the accumulation of the basic information to design the alloy composed of B2 coating on bccss matrix, bccss - B2 two-phase field was investigated in the Nb-Mo-Ni-Pd-Al system at 1273 K. It is found that Pd-rich B2-(Ni,Pd)Al phase is in equilibrium with Nb-rich bccss phase, while without Pd, the composition range of bccss coexisting with B2-NiAl phase is limited to be low Nb.

Computer Simulation Study of the Effects of Copper Solutes on Cascade Damage in Fe-Cu Alloys

1996 ◽  
Vol 439 ◽  
Author(s):  
A. F. Calder ◽  
D. J. Bacon
Keyword(s):  
Solid Solution ◽  
Alloy System ◽  
Interatomic Potentials ◽  
Irradiation Embrittlement ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Solid Solution Matrix ◽  
Solution Matrix ◽  
Apparent Stability ◽  
Cascade Damage

AbstractThe production of small, coherent BCC precipitates of copper during fast neutron irradiation of ferritic steels and their apparent stability at peak hardening size are important phenomena governing in-service irradiation embrittlement. An MD model employing manybody interatomic potentials for the Fe-Cu alloy system has been developed and used to simulate the effect of displacement cascades on both dilute random solid solutions of copper and small coherent BCC copper precipitates in an oa-iron matrix. Within the timescales that can be modelled, cascades caused only small changes to the distribution of copper atoms in both the solid solution and the precipitate studies. Vacancies are observed to bind to copper solute atoms and also to accumulate in precipitates near the interface, where they are mobile. Interstitials are mobile in the solid solution matrix and two mechanisms of interstitial entrapment by precipitates are indicated.

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