Effects of long-term aging on the structure and phase composition of a V-Mo-Zr-C alloy

1993 ◽  
Vol 28 (2) ◽  
pp. 173-177
Author(s):  
V. P. Kalyandruk ◽  
V. V. Shirokov ◽  
�. M. Lyutii
Keyword(s):  
Phase Composition

Evolution of the microstructure and phase composition of a subsurface of cast HP-type alloy during a long-term high-temperature aging

2019 ◽  
Vol 150 ◽  
pp. 166-173
Author(s):  
Sergey Yu. Kondrat'ev ◽  
Grigoriy P. Anastasiadi ◽  
Alina V. Ptashnik ◽  
Sergey N. Petrov
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Type Alloy ◽  
High Temperature Aging ◽  
Temperature Aging

scholarly journals The Effect of Simultaneous Si and Ti/Mo Alloying on High-Temperature Strength of Fe3Al-Based Iron Aluminides

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4268
Author(s):  
Věra Vodičková ◽  
Martin Švec ◽  
Pavel Hanus ◽  
Pavel Novák ◽  
Antonín Záděra ◽  
...  
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Yield Stress ◽  
Electron Backscatter Diffraction ◽  
Xrd Analysis ◽  
Iron Aluminides ◽  
High Temperature Strength ◽  
X Ray Diffraction ◽  
Backscatter Diffraction

The effect of phase composition and morphology on high-temperature strength in the compression of Fe-Al-Si-based iron aluminides manufactured by casting was investigated. The structure and high-temperature strength in the compression of three alloys—Fe28Al5Si, Fe28Al5Si2Mo, and Fe28Al5Si2Ti—were studied. Long-term (at 800 °C for 100 h) annealing was performed for the achievement of structural stability. The phase composition and grain size of alloys were primarily described by means of scanning electron microscopy equipped with energy dispersive analysis and Electron Backscatter Diffraction (EBSD). The phase composition was verified by X-ray diffraction (XRD) analysis. The effect of Mo and Ti addition as well as the effect of long-term annealing on high-temperature yield stress in compression were investigated. Both additives—Mo and Ti—affected the yield stress values positively. Long-term annealing of Fe28Al5Si-X iron aluminide alloyed with Mo and Ti deteriorates yield stress values slightly due to grain coarsening.

The Effect of Long-Term Annealing on Microstructure of Aluminide Coatings Deposited on MAR M200 Superalloy by CVD Method

2013 ◽  
Vol 592-593 ◽  
pp. 477-480
Author(s):  
Andrzej Nowotnik ◽  
Jan Sieniawski ◽  
Marcin Zawadzki ◽  
Marek Góral
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Aluminide Coating ◽  
Chemical Vapour ◽  
Base Material ◽  
Deposition Process ◽  
Nickel Superalloy ◽  
Composition Analysis ◽  
Al Content

The paper presents the influence of long-term heat treatment on aluminide coating. The MAR M-200 nickel superalloy was use as base material. The aluminide coating was deposited in low-activity chemical vapour deposition process using Ion Bond BPX Pro 325s device with following parameters: temperature 1040°C, time 12 hours, pressure 150 mbar. The samples (14 mm diameter) were annealed at 1020°C in vacuum for 12, 16 and 20 hours respectively. The XRD phase analysis and SEM microstructural observation with EDS analysis were conducted. The phase composition analysis showed that after deposition the NiAl phase is a main component of the coating. After the 20-hour-long annealing presence of Ni3Al phase in the coating was observed. Changes in structure of coatings and Al content during heat treatment were detected as well. The maximum duration of heat treatment performed for Ni superalloy with aluminide coating without significant changes in coating phase composition and microstructure is 16 hours.

Contributions of phase composition and defect structure to the long term stability of Li/MgO catalysts

2012 ◽  
Vol 103 (12) ◽  
pp. 1488-1498 ◽  
Author(s):  
Ulla Simon ◽  
Manuel Harth ◽  
Sebastian Arndt ◽  
Almuth Berthold ◽  
Oliver Görke ◽  
...  
Keyword(s):  
Phase Composition ◽  
Defect Structure ◽  
Term Stability ◽  
Long Term Stability

scholarly journals EFFICIENCY OF REINFORCEMENT OF TECHNOLOGICAL SOIL BY MINERAL MODIFIERS

2020 ◽  
pp. 115-125
Author(s):  
P. Dyakin ◽  
Yu. Pivinskiy ◽  
D. Prohorenkov ◽  
V. Doroganov
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Treatment Duration ◽  
Bending Strength ◽  
Effect Of Temperature ◽  
Firing Process ◽  
Ceramic Binder ◽  
Heat Treatment Duration ◽  
Composition Structure

The effect of temperature and duration of heat treatment of samples based on a highly concentrated ceramic binder suspension (HCBS) of a composite composition (bauxite + 11% VDKS), as well as with an additional content of 15% silicon carbide on their phase composition, structure, and some properties is studied. Long-term heat treatment (60 and 120 hours) in the temperature range 1300 - 1400 ° C is carried out in a tunnel kiln for firing dinas. In the process of heat treatment, the process of formation of secondary mullite, the oxidation of SiC followed by mullite formation, proceeds. The influence of the heat treatment duration on the phase composition, as well as the strength, apparent density, growth, SIC oxidation state, and bending strength of samples containing 15% SiC are characterized. It is found that the minimum porosity value (2.7 %) is observed when the heat treatment duration is 8 hours. This drop in porosity and a slight decrease in density is due to a certain degree of mullitization or SiC oxidation, but also to the formation of a significant volume of closed porosity. With increasing the duration of the firing process to 60 and 120 hours, the porosity indicators increase significantly, and the density decreases sharply.

scholarly journals PHASE COMPOSITION OF OXIDE FILMS FORMED ON THE SURFACE OF THE FE-CR-AL SYSTEM COATINGS

2020 ◽  
pp. 14-18
Author(s):  
V. G. Shmorgun ◽  
A. I. Bogdanov ◽  
O. V. Slautin ◽  
V. P. Kulevich
Keyword(s):  
Phase Composition ◽  
Aluminum Content ◽  
Oxide Films ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
X Ray ◽  
Glancing Angle ◽  
Stable Growth ◽  
Metastable Alumina

The phase composition of the oxide films on the surface of the Fe-Cr-Al system coatings is studied using glancing angle X-ray diffraction. It is shown that at 900 °С the formed oxide films consist of αAlO and (FeCr)O, to which FeAlO oxide is added during long-term exposure. An increase in temperature to 1100 °C intensifies the growth of oxide films, and an increase in the aluminum content ensures a stable growth of αAlO and FeAlO oxides. When the aluminum content in the coating is more than 10 at. % at large exposure times, metastable alumina δAlO is formed, the formation of which is associated with a decrease in the concentration of chromium in thin surface layers.

scholarly journals Alkali-activated grouts based on slag-fly ash mixtures: From early-age characterization to long-term phase composition

2020 ◽  
Vol 260 ◽  
pp. 120510 ◽  
Author(s):  
Abdelilah Aboulayt ◽  
Faten Souayfan ◽  
Emmanuel Roziere ◽  
Reda Jaafri ◽  
Anass Cherki El Idrissi ◽  
...  
Keyword(s):  
Phase Composition ◽  
Fly Ash ◽  
Early Age ◽  
Alkali Activated

Characteristic of Crystallite Sizes and Lattice Deformations Changes in the Oxide Layer Formed on Steel Operated for a Long Time at an Elevated Temperature

2013 ◽  
Vol 203-204 ◽  
pp. 204-207 ◽  
Author(s):  
Monika Gwoździk
Keyword(s):  
Phase Composition ◽  
Elevated Temperature ◽  
Oxide Layer ◽  
Flue Gas ◽  
Phase Identification ◽  
X Ray ◽  
Term Operation ◽  
Long Time ◽  
Crystallite Sizes

The paper presents results of studies on the phase composition, crystallite sizes and lattice deformations of oxide layers formed during a long-term operation on X10CrMoVNb9-1 steel. Test specimens were taken from a live steam pipeline operated at 535°C for 70,000 hours. X-ray studies were carried out on the tube outside surface (on the flue gas side), then the layer’s surface was polished and the diffraction measurements repeated to reveal differences in the originated oxides layer. X-ray phase analysis was performed using a SEIFFERT 3003 T/T X-ray diffractometer, with a cobalt tube of λCo= 0.17902nm wavelength. crystallographic database were used for the phase identification.

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