Effect of Chromium Carbide Introduced into a Flux Cored Wire Charge on the Structure and Properties of the Hardfacing Deposit

2020 ◽  
Vol 2020 (13) ◽  
pp. 1485-1490
Author(s):  
N. V. Kobernik ◽  
A. S. Pankratov ◽  
S. S. Sorokin ◽  
V. V. Petrova ◽  
A. L. Galinovskii ◽  
...  
Keyword(s):  
Chromium Carbide ◽  
Structure And Properties ◽  
Cored Wire

scholarly journals Research of nanoscale titanium carbides influence on the structure and properties of weld metal in automatic submerged arc welding

2018 ◽  
Vol 226 ◽  
pp. 03029
Author(s):  
Nikolay V. Kobernik ◽  
Alexander S. Pankratov
Keyword(s):  
Titanium Carbide ◽  
Weld Metal ◽  
Weld Pool ◽  
Arc Welding ◽  
Submerged Arc Welding ◽  
Structure And Properties ◽  
Cored Wire ◽  
Average Value ◽  
Submerged Arc ◽  
Primary Crystals

The influence of nanoscale refractory titanium carbide particles on the structure and properties of weld metal in automatic submerged arc welding is considered. Composite granules based on nickel were used to introduce the compound into the composition of the weld pool. Two schemes for introducing granules into the weld pool were tested, characterized by different temperature conditions: to the head part of the welding pool with the help of “ligature” and to the tail section with the help of additional filler wire. The prospects of introducing nano-sized titanium carbide into the tail part of the weld pool as part of a flux-cored wire are shown. With this method, the structure of the weld metal is observed to modify: the average size of the primary crystals of the weld metal is reduced by almost 50%. At the same time, the value of the toughness of the weld metal increases: the average value of this index increases by 36%. When titanium carbide is introduced as part of the “ligature” into the head of the weld pool, despite the effect of modifying (reducing the width of the primary crystals by 30%), the average value of the toughness of the weld metal decreases.

Application of chromium carbides in surfacing materials intended for obtaining of abrasion resistant coatings

2020 ◽  
pp. 64-68
Author(s):  
N.V. Kobernik ◽  
A.S. Pankratov ◽  
R.S. Mikheev ◽  
A.G. Orlik ◽  
S.P. Sorokin ◽  
...  
Keyword(s):  
Weld Metal ◽  
Abrasive Wear ◽  
Chromium Carbide ◽  
Cored Wire ◽  
Chromium Carbides ◽  
Electrode Wire ◽  
Deposited Metal ◽  
The Wire

The application of chromium carbides in the composition of a powder flux-cored wire mixture for applying abrasion-resistant coatings is considered. It is shown, that when using chromium carbide in the charge of the electrode wire during surfacing, the reinforcement of the weld metal is not achieved. The use of chromium carbide instead of ferrochrome changes the structure of the wire and deposited metal, which increases the hardness of the coating. Keywords: surfacing, chromium carbides, abrasive wear, surfacing material, reinforcement. [email protected]

A Production Method for Wear-Resistant Deposited Coatings Modified with TiN Particles

2017 ◽  
Vol 743 ◽  
pp. 107-111
Author(s):  
Alexander Artem'ev ◽  
Gennady Sokolov ◽  
Aleksey Antonov ◽  
Ilya Zorin ◽  
Yuri Dubtsov ◽  
...  
Keyword(s):  
Titanium Nitride ◽  
Weld Pool ◽  
Production Method ◽  
Consumable Electrode ◽  
Structure And Properties ◽  
Cored Wire ◽  
Wear Resistant

A method of arc surfacing with a consumable electrode and a flux-cored wire containing titanium nitride micro-and nanoparticles added to the weld pool was developed. The influence of the modifier on the structure and properties of the deposited coatings was studied.

scholarly journals Effect of long-term thermal aging in heat exchange equipment of fast neutron switchgears on the structure and properties of austenitic chromium-nickel steel

2018 ◽  
Vol 61 (11) ◽  
pp. 907-913
Author(s):  
A. S. Kudryavtsev ◽  
K. A. Okhapkin
Keyword(s):  
Solid Solution ◽  
Phase Composition ◽  
Impact Strength ◽  
Chromium Carbide ◽  
Thermal Aging ◽  
Carbide Phase ◽  
Structure And Properties ◽  
Secondary Phases ◽  
Secondary Precipitates

The influence of long-term operation at 515 °C on structure and properties of 09Cr18Ni9 steel was investigated. Structure and phase composition were obtained using optical and scanning electron microscopy. The phase composition of the steel in equilibrium state was determined by thermodynamic modeling in the software package Fact-Sage. As a result of the study, it was found that during the operation at 515 °C with a duration of 195,000 h, the structure changes occurred in the 09Cr18Ni9 steel with the formation of secondary phases, initiated by the release of elements with limited solubility from the supersaturated solid solution. The following secondary precipitates in structure of the solid solution of austenite presented: Cr23C6 chromium carbide, ferrite (a), G-phase. Based on comparison of the thermodynamic modeling results and on experimental determination of the phase composition, it was established that the steel structure is in a state close to equilibrium. The mechanism of structural transformations course and sequence of the secondary phases’ formation were revealed and described. At the initial stage, chromium carbide is formed, then a-ferrite is formed near the carbides, and then G-phase is formed. Results of the tests for impact strength and static elongation have shown that the change in phase composition in process of thermal aging leads to embrittlement of the steel - a reduction in ductility and impact energy. Fractografic studies of fracture surfaces of the samples have shown that the decrease in plasticity during long-term high-temperature operation is associated with softening of the grain body and strengthening of the boundaries due to secondary precipitations of the carbide phase. As a result of this process, plastic deformation is localized in the weakened volume of the body of grain surrounded by strong boundaries. The structure evolution during prolonged heat aging has the greatest effect on impact strength. At the same time, the change in ultimate and yield stress is insignificant. The main contribution to the change in mechanical characteristics of steel is made by the secondary precipitates of the carbide phase.

Structure and properties of chromium-carbide composite materials and coatings

1981 ◽  
Vol 20 (11) ◽  
pp. 805-810
Author(s):  
V. I. Trefilov ◽  
Yu. S. Borisov ◽  
R. A. Alfintseva ◽  
I. N. Gorbatov ◽  
V. V. Pushkarev
Keyword(s):  
Composite Materials ◽  
Chromium Carbide ◽  
Structure And Properties ◽  
Carbide Composite

Arc Sprayed Coatings of Ferroalloy-Base Flux-Cored Wires

2000 ◽  
Author(s):  
A.L. Borisova ◽  
I.V. Mitz ◽  
A. Kleyman
Keyword(s):  
Abrasive Wear Resistance ◽  
Structure And Properties ◽  
Properties Of Coatings ◽  
Cored Wire ◽  
Powder Charge ◽  
Substrate Adhesion ◽  
Coating Layers ◽  
Cored Wires ◽  
Sprayed Coatings ◽  
Outer Coating

Abstract This paper presents the results an experimental study on ferroalloy-base flux-cored wire coatings. The work conducted shows that it is possible to improve the structure and properties of coatings by adding aluminum to the ferrochromium powder charge and rare-earth elements and calcium to ferroboron. This reduces the oxygen content and porosity of coatings by a factor of 1.5-2. It also reduces residual tensile stresses in outer coating layers and improves coating-substrate adhesion strength as well as abrasive wear resistance.

Some Studies on Chromium Carbide Hardfacing with Self Shielded Flux Cored Wire

1994 ◽  
Vol 27 (4) ◽  
pp. 13
Author(s):  
Rakesh Sharma ◽  
M. Breazu ◽  
S. R. Gupta
Keyword(s):  
Chromium Carbide ◽  
Cored Wire
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