scholarly journals INFLUENCE OF ULTRASOUND ON DIFFUSION ZONE GROWTH KINETICS DURING HEAT TREATMENT OF NICKEL-ALUMINUM BIMETAL

2021 ◽  
pp. 18-23
Author(s):  
V. G. Shmorgun ◽  
A. I. Bogdanov ◽  
O. V. Slautin ◽  
V. P. Kulevich ◽  
S. A. Kuznecov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Chemical Composition ◽  
Growth Kinetics ◽  
Diffusion Zone ◽  
Nickel Aluminum ◽  
Eutectic Transformation ◽  
Phase And Chemical Composition ◽  
Zone Growth ◽  
Intermetallic Layers

It has been shown experimentally that the effect of ultrasound during heat treatment of the explosion-welded bimetal nickel NP2 + aluminum AD1 helps to reduce the latent nucleation period of NiAl and NiAl intermetallic layers at its interlayer boundary, reduces the temperature of the onset of eutectic transformation (~10 °C), at a temperature of intense diffusion increases the thickness diffusion zone (by 30-40%), without affecting its phase and chemical composition.

Investigation of the Influence of Ultrasound Action on Diffusion Processes in an Explosion-Welded Bimetal System Cu-Al during Heat Treatment

2021 ◽  
Vol 410 ◽  
pp. 306-312
Author(s):  
Oleg V. Slautin ◽  
Dmitriy V. Pronichev ◽  
Evgeniy V. Kuz’min
Keyword(s):  
Heat Treatment ◽  
Composite Material ◽  
Diffusion Zone ◽  
Diffusion Processes ◽  
Intermetallic Phases ◽  
Layered Composite ◽  
Acoustic Vibrations ◽  
Fixed Temperature ◽  
Eutectic Transformation ◽  
Ultrasound Action

The influence of ultrasound on the main regularities of the formation and growth of the diffusion zone at the interlayer boundary of an explosion-welded layered composite material of Al-Cu systems is investigated. It is proved that the effect of ultrasound contributes to the reduction of the latent period of the nucleation of intermetallic phases at the interlayer boundary, lowers the temperature of the beginning of the eutectic transformation (by about 10 ° C), but at the same time does not affect the phase composition of the diffusion zone as a result of homogeneous reactions at the boundary of contact of solids. It has been established that the thickness of the diffusion zone, with the duration of the supplied acoustic vibrations, ensures the absence of cracks in the diffusion zone, leading to delamination of the material, increases by 30-40% at a fixed temperature of intense diffusion.

Effect of the High-Heating on the Chemical and Phase Composition of the Al-Ni-Cr Layered Coatings

2016 ◽  
Vol 870 ◽  
pp. 169-174 ◽  
Author(s):  
Victor Georgievich Shmorgun ◽  
A.I. Bogdanov ◽  
A.O. Taube
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Chemical Composition ◽  
Binary System ◽  
Diffusion Coatings ◽  
Layered Coatings ◽  
Structure Phase ◽  
High Heating ◽  
Phase And Chemical Composition ◽  
Diffusion Redistribution

The transformation of the structure, phase and chemical composition of the diffusion coatings of the system Al-Ni and Al-Cr-Ni at 1100 °C is studied. It is shown that the diffusion redistribution of Al by the coating thickness during the heat treatment is slower in the system Al-Cr-Ni than in the binary system Al-Ni.

scholarly journals FORMATION OF A MULTI-LAYERED TITANO-STEEL INTERMETALLIC COMPOSITE

2020 ◽  
pp. 6-14
Author(s):  
V. N. Arisova ◽  
L. M. Gurevich ◽  
V. O. Kharlamov ◽  
D. D. Tverdysheva ◽  
V. A. Izyumsky
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Spectral Analysis ◽  
Chemical Composition ◽  
X Ray ◽  
Intermetallic Composite ◽  
Intermetallic Layers

The work presents the results of studies on the formation of intermetallic layers in a five-layer explosion-welded composite titanium VT-20+steel 08Cr18Ni10Ti after heat treatment at temperatures of 800, 850 and 900 °C and holding times of 4 and 10 hours. The structure, microhardness, chemical composition of the diffusion zones of the composite were studied using optic, electron microscopy and X-ray spectral analysis.

BÖHLER W403 VMR

Alloy Digest ◽  
2013 ◽  
Vol 62 (9) ◽  
Keyword(s):  
Heat Treatment ◽  
Chemical Composition ◽  
Physical Properties ◽  
Tool Steel ◽  
Raw Materials ◽  
Heat Treating ◽  
Diffusion Annealing ◽  
Selection Of

Abstract Böhler (or Boehler) W403 VMR is a tool steel with outstanding properties, based not only on a modified chemical composition, but on the selection of highly clean raw materials for melting, remelting under vacuum (VMF), optimized diffusion annealing, and a special heat treatment. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on forming and heat treating. Filing Code: TS-721. Producer or source: Böhler Edelstahl GmbH.

Analysis of CoCrMo Surface Oxide Removal by Alumina Blasting before Porcelain Firing in Dental Restorations

2012 ◽  
Vol 730-732 ◽  
pp. 9-14 ◽  
Author(s):  
Bruno Henriques ◽  
Filipe Silva ◽  
Delfim Soares
Keyword(s):  
Heat Treatment ◽  
Surface Roughness ◽  
Chemical Composition ◽  
High Alumina ◽  
X Ray ◽  
Dental Restorations ◽  
Ceramic Bond ◽  
Xrf Scanning ◽  
Oxide Removal

The purpose of this work was to perform a chemical and mechanical characterization of a preoxidized CoCrMo alumina blasted surface. This is a commonly performed surface treatment used in metal-porcelain systems for dental restorations to remove oxides formed during preoxidation heat treatment from the metal’s surface. CoCrMo dental alloy’s specimens produced by lost wax process were examined in terms of chemical composition using X-Ray fluorescence spectroscopy (XRF), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS); in terms of mechanical characteristics through the means of a microhardness test and in terms of surface roughness using a profilometer. It was investigated the chemical composition of various surface conditions: non-preoxidized, preoxidized, ground oxidized surface and sandblasted oxidized surface. After alumina blasting, the oxides level on metal’s surface remained high. Alumina blasting treatment (Ø110 µm) produced an 84% increase of CoCrMo surface hardening and an increase in surface roughness (Ra=0.58 µm). It was found alumina contaminants on the metal’s surface. Therefore, it was concluded that alumina blasting do not entirely removes the oxide layer formed during preoxidation heat treatment. It produced a chemical and mechanical surface modification that can influence the metal-ceramic bond strength.

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