Formation of the Diffusion Zone in Explosion Welded Composite Cr20Ni80 - AD1 at Liquid-Phase Interaction

2021 ◽  
Vol 410 ◽  
pp. 531-536
Author(s):  
Victor Georgievich Shmorgun ◽  
Artem I. Bogdanov ◽  
Dmitriy V. Shcherbin
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Liquid Phase ◽  
Ternary Compound ◽  
Diffusion Zone ◽  
Diffusion Coating ◽  
Phase Interaction ◽  
Coating Structure

The paper presents the investigation on the structure, chemical and phase composition of the diffusion coating formed during the liquid-phase heat treatment in the explosion-welded Cr20Ni80 + AD1 bimetal. It is shown that the coating structure consists of NiAl3, CrAl7, Ni2Al3 intermetallic inclusions, as well as a metastable ternary compound – τ2-phase (Al77.5Cr12.5Ni10) of different dispersion and morphology. There are no crystallization defects in the coating structure.

scholarly journals FORMATION OF THE STRUCTURE AND COMPOSITION OF THE DIFFUSION INTERACTION ZONE DURING THE HEAT TREATMENT OF THE EXPLOSION-WELDED AD1 + Cr20Ni80 COMPOSITE IN THE PRESENCE OF A LIQUID PHASE

2021 ◽  
pp. 7-11
Author(s):  
V. G. Shmorgun ◽  
A. I. Bogdanov ◽  
D. V. Shcherbin ◽  
V. P. Kulevich
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Melting Point ◽  
Liquid Phase ◽  
Intermetallic Compounds ◽  
Diffusion Coating ◽  
Phase Interaction ◽  
Interaction Zone ◽  
Coating Structure ◽  
Study Results

The paper presents the study results of the structure, chemical and phase composition of the diffusion coating formed during the heat treatment of the explosion-welded Cr20Ni80 + AD1 bimetal according to the regime providing liquid-phase interaction (above the melting point of aluminum) on the surface of the Cr20Ni80 alloy. It is shown that its structure consists of inclusions of NiAl, CrAl, NiAl intermetallic compounds, as well as a metastable ternary compound - τ-phase with composition of AlCrNi of different dispersion and morphology. There are no crystallization defects in the coating structure.

Micromorphology and Characterization of V2O3 Nanoparticles Produced by the Liquid Phase Reduction-Heat Treatment

2019 ◽  
Vol 944 ◽  
pp. 650-656
Author(s):  
Ming Rui Zhang ◽  
Yuan Qin ◽  
Dao Zhang ◽  
Guang Yuan Wang ◽  
Sen Yang
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Liquid Phase ◽  
Thermal Treatment ◽  
Oxalic Acid ◽  
Structure And Morphology ◽  
Phase Reduction ◽  
Novel Method ◽  
Composition Structure

The liquid phase reduction-heat treatment has been used to prepare V2O3nanoparticles in this paper. It is a novel method that the precursor was developed by Oxalic acid dehydrate (H2C2O4·2H2O) reduction of V2O5powder in anhydrous ethanol. V2O3nanoparticles were successfully obtained by thermal treatment of the precursor. The phase, composition, structure, and morphology of the as-obtained samples were verified by XRD, XPS, SEM and TEM measurements. Meanwhile, the possible formation mechanism of V2O3in the heat-treatment is briefly discussed by analyzing the DSC.

scholarly journals PHASE COMPOSITION OF THE INTERACTION ZONE FORMED IN THE TI-CU SYSTEM COMPOSITE IN THE PRESENCE OF A LIQUID PHASE

2020 ◽  
pp. 18-24
Author(s):  
V. G. Shmorgun ◽  
O. V. Slautin ◽  
A. G. Serov ◽  
V. P. Kulevich
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Phase Composition ◽  
Liquid Phase ◽  
Nickel Alloy ◽  
Intermetallic Compounds ◽  
Melting Temperature ◽  
Weight Fraction ◽  
Interaction Zone ◽  
Copper Nickel Alloy

It was shown that heat treatment of Ti-Cu system composites at temperatures above the melting temperature of copper (copper-nickel alloy) leads to the formation of an interaction zone, the structure and phase composition of which is determined by the temperature and time of existence of the liquid melt solid solution in contact with the interlayer. Other things being equal, an increase in the exposure time leads to an increase in the volume of reacted titanium and the weight fraction of titanium-rich intermetallic compounds in its structure.

Investigation of the Phase Composition of the Diffusion Zone in the Al-Ni-Cr Composite Material

2014 ◽  
Vol 698 ◽  
pp. 430-433 ◽  
Author(s):  
Victor Georgievich Shmorgun ◽  
A.O. Taube ◽  
Aleksandr Vasilevich Krokhalev
Keyword(s):  
Heat Treatment ◽  
Composite Material ◽  
Phase Composition ◽  
Isothermal Section ◽  
Diffusion Zone ◽  
Room Temperature ◽  
State Diagram ◽  
Explosion Welding

This paper describes the investigation of the phase composition of the diffusion zone in the H20N80+AD1 composite material obtained by explosion welding, after heat treatment at 630оС, 75h. The isothermal section of the Al-Cr-Ni state diagram at room temperature is given. Microhardness of diffusion zone layers is measured.

scholarly journals ESTIMATION OF WEAR RESISTANCE OF INTERMETALLIC COATINGS BASED ON COPPER ALUMINIDES

2020 ◽  
pp. 14-17
Author(s):  
V. G. Shmorgun ◽  
O. V. Slautin ◽  
V. P. Kulevich ◽  
A. A. Artem’ev ◽  
O. M. Chukova
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Liquid Phase ◽  
Abrasive Wear ◽  
Explosion Welding ◽  
Subsequent Heat Treatment ◽  
Phase Interaction ◽  
Diffusion Coatings ◽  
Intermetallic Coatings ◽  
Tribotechnical Characteristics

The wear resistance of the Al-Cu system diffusion coatings, obtained using explosion welding and subsequent heat treatment in modes providing solid and liquid-phase interaction, was investigated, and their tribotechnical characteristics were assessed during scratching and under conditions of abrasive wear.

A Contribution to the Structure Characteristics and Phase Composition of Vanadium-Phosphorus Catalysts Prepared from the VOPO4.xH2O.yH3PO4 Precursor

1992 ◽  
Vol 57 (12) ◽  
pp. 2475-2480 ◽  
Author(s):  
Milan Brutovský ◽  
Štefan Gerej ◽  
Ján Novák ◽  
Lucia Ferdinandyová
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Ir Spectra ◽  
Metal Cations ◽  
Preparation Procedure ◽  
Final Temperature ◽  
Structure Characteristics ◽  
Heat Treatment Regime ◽  
Condensed Phosphates ◽  
Defective Crystals

Catalysts were prepared from VOPO4.xH2O.yH3PO4 (x = 0.3-2, y = 0.2-0.85) by reduction with SO2 up to a final temperature of 750-800 °C, and activated in a reaction mixture of 1.0-1.4% butane in air up to 500 °C. The structure characteristics and phase composition of the catalysts were found to be affected by the preparation procedure and heat treatment regime. Their diffraction lines and IR spectra revealed that the catalysts from larger and less defective crystals than catalysts which were obtained from the VOHPO4.xH2O.yH3PO4 precursor and activated in the reaction mixture at temperatures up to 500 °C. In the catalysts prepared by the above procedure, the tendency to the formation of phases of higher-condensed phosphates, in particular VO(PO3)2 or even V(PO3)3, increases with increasing n(P):n(V) ratio and is then more pronounced than with vanadium-phosphorus catalysts prepared by other procedures. The tendency to the formation of the catalytically less active condensed phosphates is partly suppressed by the embedding of modifying metal cations (Fe or Cu in this case).

scholarly journals Removal of Tramp Elements within 7075 Alloy by Super-Gravity Aided Rheorefining Method

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 701 ◽  
Author(s):  
Lei Guo ◽  
Xiaochun Wen ◽  
Qipeng Bao ◽  
Zhancheng Guo
Keyword(s):  
Heat Treatment ◽  
Liquid Phase ◽  
7075 Aluminum Alloy ◽  
Total Removal ◽  
Tramp Element ◽  
Removal Ratio ◽  
Gravity Coefficient ◽  
Flow Through ◽  
Solid Phases ◽  
7075 Alloy

An investigation was made on the super-gravity aided rheorefining process of recycled 7075 aluminum alloy in order to remove tramp elements. The separation temperatures in this study were selected as 609 °C, 617 °C and 625 °C. And the gravity coefficients were set as 400 G, 700 G, 1000 G. The finely distributed impurity inclusions will aggregate to the grain boundaries of Al-enriched phase during heat treatment. In the field of super-gravity, the liquid phase composed of tramp elements Zn, Cu, Mg et al. will flow through the gaps between solid Al-enriched grains and form into filtrate. Both the weight of filtrate and removal ratio of tramp element improved with the increase of gravity coefficient. The total removal ratio of tramp element decreased with the fall of temperature due to the flowability deterioration of liquid phase. The time for effective separation of liquid/solid phases with super-gravity can be restricted within 1 min.

Representation of VLE and liquid phase composition with an electrolyte model: application to H3PO4–H2O and H2SO4–H2O

2002 ◽  
Vol 194-197 ◽  
pp. 729-738 ◽  
Author(s):  
Mourad Cherif ◽  
Arbi Mgaidi ◽  
Mohamed Naceur Ammar ◽  
Manef Abderrabba ◽  
Walter Fürst
Keyword(s):  
Phase Composition ◽  
Liquid Phase ◽  
Model Application ◽  
Liquid Phase Composition

Microstructure and Mechanical Properties of Ti-6Al-4V Manufactured by SLM

2015 ◽  
Vol 651-653 ◽  
pp. 677-682 ◽  
Author(s):  
Anatoliy Popovich ◽  
Vadim Sufiiarov ◽  
Evgenii Borisov ◽  
Igor Polozov
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Behavior ◽  
Ductile Fracture ◽  
Elevated Temperatures ◽  
Initial Material ◽  
Laser Melting ◽  
Microstructure And Mechanical Properties ◽  
Before And After

The article presents results of a study of phase composition and microstructure of initial material and samples obtained by selective laser melting of titanium-based alloy, as well as samples after heat treatment. The effect of heat treatment on microstructure and mechanical properties of specimens was shown. It was studied mechanical behavior of manufactured specimens before and after heat treatment at room and elevated temperatures as well. The heat treatment allows obtaining sufficient mechanical properties of material at room and elevated temperatures such as increase in ductility of material. The fractography of samples showed that they feature ductile fracture with brittle elements.

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