scholarly journals RESEARCH OF PLASMA SPRAYING OF THE ZRO2 – Y2O3 ELECTROLYTE COATINGS / ZRO2 – Y2O3 ELEKTROLITINIŲ DANGŲ PLAZMINIO PURŠKIMO TYRIMAS

2015 ◽  
Vol 6 (6) ◽  
pp. 621-625
Author(s):  
Oleg Devoino ◽  
Vasily Okovity
Keyword(s):  
Phase Composition ◽  
Plasma Spraying ◽  
Optical Metallography ◽  
Structure And Properties ◽  
Coating Structure ◽  
Ray Method ◽  
Preliminary Heating ◽  
X Ray ◽  
Cooling Technology ◽  
The Given

A quick cooling of coatings for the forming of the electrolyte layers with the given phase composition is widely used. In this work the preliminary heating of the specimens was applied instead of quick cooling technology. The influence of the substrate preliminary heating on the ZrO2 – Y2O3 coatings structure and properties was investigated. The optimal of the spraying of coatings from the Ni and ZrO2 – Y2O3 powders mechanical mix was determined. The research on the coating structure was carried out analysing the application of the optical metallography, scanning microscopy and X-ray method. Greitas dangų aušinimas siekiant suformuoti tam tikros fazinės sudėties elektrolito sluoksnį yra plačiai taikoma technologija. Šiame darbe vietoj greito aušinimo technologijos buvo taikomas išankstinis substrato pakaitinimas. Nustatyta ZrO2 – Y2O3 dangų struktūros ir savybių priklausomybė nuo substrato pakaitinimo temperatūros ir parinkti optimalūs dangų iš Ni ir ZrO2 – Y2O3 miltelių mišinio purškimo parametrai. Taikant optinę metalo­grafiją, skenuojančią mikroskopiją ir rentgenografinę analizę atlikti užpurkštų dangų struktūros tyrimai.

Influence of Electrolyte-Plasma Hardening Technological Parameters on the Structure and Properties of Banding Steel 2

2020 ◽  
Vol 989 ◽  
pp. 787-792
Author(s):  
Erkezhan Erkinbekkyzy Tabieva ◽  
Laila Gylymmeddenovna Zhurerova ◽  
Daryn Baizhan
Keyword(s):  
Aqueous Solution ◽  
Phase Composition ◽  
Processing Conditions ◽  
Structure And Properties ◽  
Technological Parameters ◽  
Initial State ◽  
Plasma Surface ◽  
X Ray ◽  
Surface Quenching ◽  
Technological Processing

This work is devoted to the study of the influence of technological parameters of electrolytic-plasma surface quenching (EPQ) on the structure and surface properties of samples of bandage steel 2. In the electrolytic-plasma treatment, we performed the cathode mode in an electrolyte containing an aqueous solution of 20% carbamide (NH2)2CO and 20% sodium carbonate Na2CO3, on the installation of EPO with appropriate technological processing conditions. According to the electron-optical, X-ray phase studies, the phase composition of the steel after the EPQ was determined. This differs from the initial one by the formation of cementite and iron oxides on the surface of the samples. It is established that the microhardness of the bandage steel 2 after the EPQ during heating for 4 seconds increases 2.4 times, in comparison with the initial state.

Effect of Nanoadditives on the Structure and Properties of Austempered Ductile Irons

2018 ◽  
Vol 919 ◽  
pp. 34-42
Author(s):  
Julieta Atanasova Kaleicheva ◽  
Valentin Plamenov Mishev
Keyword(s):  
Impact Toughness ◽  
Cubic Boron Nitride ◽  
Optical Metallography ◽  
Nanosized Particles ◽  
Structure And Properties ◽  
Cast Irons ◽  
X Ray ◽  
Resistance Increase ◽  
Bainitic Structure ◽  
Scanning Electron

In the present study austempered ductile irons (ADI) with an upper and lower bainitic structure with nanosized particles of cubic boron nitride cBN (50nm) are studied. The austempering modes include austenization at 900оС during an hour and isothermal retention at 280оС from 0.5 to 6 hours and at 380oС from 0.5 to 6 hours. The samples microstructure is investigated by means of an optical metallography, scanning electron microscopy and X-ray analysis. Tests for hardness, impact toughness and wear are performed. The influence of nanosized additives on the kinetic of the bainitic transformation and on the morphology of the obtained bainitic structure is studied. It is established that the changes of the bainitic cast irons microstructure under influence of the nanoparticles of cBN lead to the cast irons impact toughness and wear resistance increase. The research is aimed at expanding the scope for new ADI applications in the industry.

scholarly journals ENGINEERING AND RESEARCH OF WEARABILITY COATING ON THE BASIS OF HIGH-STRENGTH STEEL

2017 ◽  
Author(s):  
G. Tsvetkova ◽  
M. Skotnikova
Keyword(s):  
Wear Resistance ◽  
High Strength Steel ◽  
High Strength ◽  
Optical Metallography ◽  
Structure And Properties ◽  
X Ray ◽  
Relative Wear Resistance ◽  
Strengthening Phases ◽  
Facing Material ◽  
Martensite Structure

Methods of the optical metallography, TEM, SEM- technique, X-ray analysis, tests for hardness and wear resistance, are resulted results of research and optimization of structure and properties facing materials with austenite-martensite structure and with various quantity of strengthening phases. The maintenance in facing material austenite 38% is shown, that, martensite 32% and strengthening phases of 30% provide the highest relative wear resistance  = 5.89 and hardness HRC 61.

Influence of Heat Treatment on the Phase Composition and Microhardness of Coatings Based on Ti3SiC2/ TiC

2020 ◽  
Vol 839 ◽  
pp. 137-143 ◽  
Author(s):  
Dastan Buitkenov ◽  
Bauyrzhan K. Rakhadilov ◽  
Dosym Erbolatuly ◽  
Zhuldyz Sagdoldina
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Structural Analysis ◽  
Tool Steel ◽  
Uniform Structure ◽  
Structure And Properties ◽  
Powder Coatings ◽  
Detonation Spraying ◽  
X Ray

The paper discusses the results of studying the structure and properties of powder coatings based on Ti3SiC2/TiC, obtained by the method of detonation spraying on the surface of the tool steel N9. It is determined that the coating has a uniform structure, cracks and delaminations are not observed. The results of X-ray structural analysis of coatings showed that the coating before annealing consists of phases TiC and Ti3SiC2. After annealing, the formation of TiO2 phases and an increase in the intensity of the (103) and (108) reflections of the Ti3SiC2 phases are observed. It is established that an increase in the content of the phases of Ti3SiC2 in coatings leads to an increase in the microhardness of coatings.

scholarly journals Кислородные вакансии и валентные состояния железа в соединениях SrFeO-=SUB=-3-delta-=/SUB=-

2020 ◽  
Vol 62 (10) ◽  
pp. 1698
Author(s):  
В.Д. Седых ◽  
О.Г. Рыбченко ◽  
Э.В. Суворов ◽  
А.И. Иванов ◽  
В.И. Кулаков
Keyword(s):  
Phase Composition ◽  
Valence State ◽  
Oxygen Vacancies ◽  
Single Phase ◽  
Two Phase ◽  
X Ray ◽  
Phase Structures ◽  
Valence States ◽  
The Given ◽  
Local Oxygen

The X-ray and Mossbauer studies of the Brownmillerite phase have been carried out in the given work and the well-known literature data on the single phase compounds with a perovskite structure in ferrite strontium SrFeO3-δ have been analyzed. It has been found out that all Fe valence states for any phase composition of ferrite strontium are determined by its local oxygen environment. It allows us to understand the behavior of Fe transition from one valence state to another when adding oxygen vacancies and to explain the Fe structural states in the SrFeO3-δ oxide including single and two-phase compositions. This approach is a more general case for description of the all known compounds and synthesized phase combinations in SrFeO3-δ and the formula considered in literature for the single-phase structures well agrees with it.

scholarly journals Structure and preferred orientation of primary phases of Ni-Al-Co-based alloy alloyed by Rhenium after annealing and creep exposure

2018 ◽  
Vol 143 ◽  
pp. 03003
Author(s):  
Elena Nikonenko ◽  
Natalya Popova ◽  
Alisa Nikonenko ◽  
Nina Koneva
Keyword(s):  
Phase Composition ◽  
Primary Phase ◽  
Preferred Orientation ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Cubic Crystal ◽  
X Ray ◽  
Face Centered ◽  
The Given ◽  
Phase Phase

The present paper investigates phase composition and fine structure of Ni-Al-Co-based alloy alloyed by Rhenium (Re) (~3 at.%), as well as studies preferred orientation of the given alloy primary phases by means of scanning electron microscopy and X-ray diffraction analysis. The original state was given as the alloy which underwent a complete cycle of heat treatment: stepwise homogenization, cooling, annealing, and cooling at 100°C/min back to room temperature. The alloy was further subject to annealing at 1000°C for 105 h and 968 h. It was also exposed to creep experiments at the same temperature for 105 h (loading 320 MPa), and for 968 h (220 MPa). γ- and γ′-phases were established to be the primary phases in both states of face-centered cubic crystal lattice. γ′-phase (phase with ordered atom arrangement having L12 superstructure) was the primary phase in all states of the alloy. Investigations showed that Re being able not to dissolve in the primary phases served as a phase-forming element. Phase composition and phase morphology were studied. The influence of high-temperature annealing and creep on superalloy structure and morphology of γ′-phase were defined. The influence of creep on the structure was proven to be different from the annealing effect. First, creep generated larger dissipation of orientations than annealing. Second, anisotropy of γ′-phase cuboids could be observed at meso-level. Cuboids partially joined together. Third, spheroidized cuboids could be often met after creep.

Influence of Electrolyte-Plasma Hardening Technological Parameters on the Structure and Properties of Banding Steel 2

2020 ◽  
Vol 839 ◽  
pp. 57-62
Author(s):  
Erkezhan Erkinbekkyzy Tabieva ◽  
Laila Gylymmeddenovna Zhurerova ◽  
Daryn Baizhan
Keyword(s):  
Aqueous Solution ◽  
Phase Composition ◽  
Processing Conditions ◽  
Structure And Properties ◽  
Technological Parameters ◽  
Initial State ◽  
Plasma Surface ◽  
X Ray ◽  
Surface Quenching ◽  
Technological Processing

This work is devoted to the study of the influence of technological parameters of electrolytic-plasma surface quenching (EPQ) on the structure and surface properties of samples of bandage steel 2. In the electrolytic-plasma treatment, we performed the cathode mode in an electrolyte containing an aqueous solution of 20% carbamide (NH2)2CO and 20% sodium carbonate Na2CO3, on the installation of EPO with appropriate technological processing conditions. According to the electron-optical, X-ray phase studies, the phase composition of the steel after the EPQ was determined this differs from the initial one by the formation of cementite and iron oxides on the surface of the samples. It is established that the microhardness of the bandage steel 2 after the EPQ during heating for 4 seconds increases 2.4 times in comparison with the initial state.

IDENTIFICATION OF RESIDUAL STRESSESIN PRODUCTS FROM CARBON- CARBONACEOUSMATERIALS

2015 ◽  
Vol 2 (4) ◽  
pp. 0-0
Author(s):  
Анна Казначеева ◽  
Anna Kaznacheeva ◽  
Юлия Полинко ◽  
Yuliya Polinko
Keyword(s):  
Experimental Data ◽  
Phase Composition ◽  
Residual Stresses ◽  
Experimental Studies ◽  
Quality Criterion ◽  
Production Environment ◽  
Ray Method ◽  
X Ray ◽  
Artificial Graphite ◽  
Degree Of Graphitization

The method of assessing the level of residual stresses in graphitic carbon shell of revo-lution, by interpreting the experimental data obtained by the x-ray method is proposed. The results of experimental studies of mental-phase composition, the parameters of the crystal lattice, the degree of graphitization and texturing of pyrolytic reinforced carbon-carbonaceous composite are given. Estimation of the level of residual technological tensions resulting in defects of products has been performed at the micro and macro stages. Quality criterion is written as a deviation square sum, calculated and measured broa-dening of diffractogram lines. High informativity of the radiographic method for estimating artificial graphite prod-uct quality and the possibility of using this method in the production environment.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

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