scholarly journals QUALITY IMPROVEMENT OF CAST CYLINDRICAL BAR OF VACUUM INDUCTION MELTING FROM INCONEL 718 ALLOY AT PJSC “RUSPOLIMET”

2019 ◽  
Vol 62 (4) ◽  
pp. 257-262
Author(s):  
A. I. Demchenko ◽  
E. N. Korzun ◽  
E. A. Chernyshov
Keyword(s):  
Casting Speed ◽  
Inconel 718 ◽  
Induction Furnace ◽  
Macro Level ◽  
Vacuum Induction Melting ◽  
Vacuum Induction Furnace ◽  
Induction Melting ◽  
Axial Zone ◽  
High Quality ◽  
Inconel 718 Alloy

The analysis of technological processes of smelting and casting of cylindrical bars from Inconel 718 alloy, obtained in a vacuum induction furnace at PJSC “Ruspolimet”, was performed. The existing technology does not ensure the production of a sound bar of the required quality due to the presence of porosity in the axial zone, and also due to liquation at the macro level of elements such as chromium, nickel, niobium. The results have shown the need to adjust the parameters of casting and solidification of bars from the Inconel 718 alloy. The task to get high-quality sound bar was set without changing the main technical parameters of production, namely: type of furnace – vacuum induction furnace with capacity of 3 tons; material of the furnace lining – ceramics based on aluminum oxide Al2O3 ; type of the casting mold – cylindrical mold for bar diameter of410 mm; diameter of crystallizer for vacuum-arc remelting –450 mm. With the use of the Thermo-Calc program (version 2017a), the solidus temperatures for the equilibrium solidification process and for the non-equilibrium process were clarified, which were 1211 °С and 1091 °С, respectively. Based on the results obtained, the casting speed (SCM LP) system corrects casting speed by reducing the diameter of the casting nozzle from 32 to28 mm and casting temperature by reducing it from 1470 to1460 °C. According to the corrected technology, a batch of bars has been smelted. From the bar of the first batch, transverse templates were selected to determine the chemical composition and longitudinal temp lates for metallographic analysis. Metallographic studies have been carried out that suggest a decrease in porosity of axial zone of the bar and a decrease in phase separation at the macro level. Based on the results obtained, the authors proposed to introduce approp riate changes in casting technology. It is shown that computer modeling of metallurgical processes of metal casting and crystallization allows developing a technology of obtaining a high-quality bar already at the first redistribution, while avoiding appearance of products that do not meet customer requirements.

scholarly journals Investigations on the Process of Lead Removal from Cu-Pb Alloys During their Melting in Vacuum Induction Furnace

2017 ◽  
Vol 62 (4) ◽  
pp. 2449-2453 ◽  
Author(s):  
G. Siwiec ◽  
P. Buliński ◽  
M. Palacz ◽  
J. Smołka ◽  
L. Blacha
Keyword(s):  
Thermodynamic Analysis ◽  
Induction Furnace ◽  
Vacuum Induction Melting ◽  
Vacuum Induction Furnace ◽  
Lead Removal ◽  
Induction Melting ◽  
Melting Technology

AbstractThe paper presents analysis and assessment of operating power of vacuum induction furnace in relation to the efficiency of lead removal from Cu-Pb alloy in VIM (vacuum induction melting) technology. Thermodynamic analysis of the process is performed as well.

Hardness and Microstructure Change During Annealing Process of a Modified Inconel-718

1985 ◽  
Vol 43 ◽  
pp. 340-341
Author(s):  
Chen-Ti Hu ◽  
Yau-Tsurng Syu
Keyword(s):  
Inconel 718 ◽  
Hot Forging ◽  
Solution Treatment ◽  
Melting Furnace ◽  
Annealing Process ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Rockwell Hardness ◽  
Inconel 718 Alloy ◽  
Complete Investigation

A modified Inconel 718 alloy with a higher content of Mo and lower was prepared from metals of electrolytic grade purity with a L-H IS 8/III vacuum induction melting furnace. The results of chemical analysis were shown in Table 1. After about 80 pet reduction in thickness with hot forging, material was then subjected to 1200°C solution treatment for one hour, air cool and 720°C ageing treatment for 16 hour, air cool. An uniformly dispersed γ’ and γ” precipitates was obtained.Material was plastically deformed to 70 pet reduction in thickness by cold rolling treatment. Then all specimens were divided into four groups and annealed in salt baths with temperatures of 750°C, 850°C, 920°C and 1060°C, respectively. 850°C was chosen to conduct a complete investigation of interior microstructures of different time periods: (1) 2 sec (2) 5 sec (3) 10 sec (4) 30 sec (5) 1 min (6) 5 min (7) 10 min (8) 20 min (9) 35 min (10) 1 hr (11) 2hr. Hardness of all thermomechanically treated specimens were examined with a Rockwell Hardness machine, using RC and RB scales.

scholarly journals The possibility of using high-quality fused magnesia in the manufacture of crucibles for vacuum-induction melting

2019 ◽  
pp. 60-64
Author(s):  
B. L. Krasnii ◽  
K. I. Ikonnikov ◽  
V. S. Anikanov ◽  
A. L. Galganova ◽  
M. A. Mikhailov
Keyword(s):  
Induction Furnace ◽  
Raw Material ◽  
Molar Ratio ◽  
Vacuum Induction Melting ◽  
Vacuum Induction Furnace ◽  
Induction Melting ◽  
Concrete Technology ◽  
Nickel Cobalt ◽  
Subsequent Decomposition ◽  
Physical And Mechanical Characteristics

The prospect of using crystalline fused magnesia (FL LC) in the manufacture technology of melting crucibles by the method of isostatic pressing is shown. It has been established that the production of a material based on MgO using concrete technology is limited to the hydration and loosening of the structure due to the formation and subsequent decomposition of brucite (native magnesia). The physical and mechanical characteristics of the obtained products are given. The effect of the CaO/SiO2 ratio on the corrosion and erosion resistance of products is considered. The raw material should have a molar ratio of these oxides of more than 1,7. Pressed crucibles were tested in the production of nickel, cobalt and tin based alloys in a vacuum induction furnace. The parameters of operation of products in the enterprise are shown. The effect of clogging by crucible materials during smelting of pure nickel has also been studied. The absence of contamination of the melt with crucible materials such as silicon dioxide, aluminosilicates and oxide films, etc., has been established.

THE VACUUM INDUCTION MELTING-POURING INSTALLATION VIM 12 III HMC FOR HIGH QUALITY SUPPERALLOYS NICKEL BASE PRODUCTION

2014 ◽  
Vol 0 (5) ◽  
pp. 5-5 ◽  
Author(s):  
D.E. Kablov ◽  
◽  
E.G. Shompolov ◽  
V.V. Sidorov ◽  
A.V. Gorunov ◽  
...  
Keyword(s):  
Vacuum Induction Melting ◽  
Induction Melting ◽  
High Quality ◽  
Nickel Base

Influence of Rare Earth Additions to an Inconel 718 Alloy

MRS Advances ◽  
2020 ◽  
Vol 5 (59-60) ◽  
pp. 3035-3043
Author(s):  
Luis E. Gonzalez A. ◽  
Arnoldo Bedolla-Jacuinde ◽  
Francisco V. Guerra ◽  
A. Ruiz
Keyword(s):  
Rare Earth ◽  
Inconel 718 ◽  
Thermomechanical Processing ◽  
Charpy Impact ◽  
Microstructural Characterization ◽  
Vacuum Induction Furnace ◽  
Inconel 718 Alloy ◽  
Impact Tests ◽  
Rare Earth Additions ◽  
The Impact

AbstractThis work analyzes the effect of rare earth additions to an Inconel 718 superalloy; for this purpose, two 8 kg ingots of a commercial composition of Inconel 718 were made in a vacuum induction furnace. One of them (In718) with the base composition and the other one (In718RE) with an addition of 0.04wt% of mischmetal (rare earths alloy based on cerium and lanthanum). Both alloys were cast into metallic molds into the vacuum chamber and let to solidify. The alloys were then solubilized for two hours at 1155 °C to eliminate deleterious phases, rolled at 1100 °C to get a reduction of 50% in thickness, then aged for 16 hours at 720 °C and 620 °C by 8 hours each. A complete microstructural characterization was undertaken by optical and electronic (SEM and TEM) microscopy and X-ray diffraction. Mechanical characterization was done by hardness tests, tensile and Charpy impact tests. Results show a slight improvement of the tensile and hardness values for the alloy with rare earth additions. However, no notorious difference was observed during the impact tests, since both alloys show the same values. These mechanical results are discussed in terms of the obtained microstructure. Both alloys are mainly composed by γ, γ´, γ´´ and carbides. It was observed that primary carbides nucleate rare earth particles; therefore, higher number of carbides and of larger size (according to a size distribution) are observed in the alloy with rare earth additions. The presence of such carbides prevents the grain growth during the thermomechanical processing which in turn improve the mechanical properties.

scholarly journals РЕАЛИЗАЦИЯ SLM - ТЕХНОЛОГИИ ДЛЯ ИЗГОТОВЛЕНИЯ ОБРАЗЦОВ ИЗ ЖАРОПРОЧНОГО СПЛАВА INCONEL 718, ПРИМЕНЯЕМОГО В АВИАЦИОННО-КОСМИЧЕСКОЙ ТЕХНИКЕ

2019 ◽  
pp. 69-75
Author(s):  
Сергей Викторович Аджамский
Keyword(s):  
Inconel 718 ◽  
Additive Technologies ◽  
Print Quality ◽  
Layer By Layer ◽  
High Quality ◽  
Inconel 718 Alloy ◽  
Laser Technology ◽  
Heat Resistant Alloy ◽  
Resistant Alloy ◽  
Heat Resistant

The new production method, called additive technologies, is a method with the ability to produce 3D products in layers. One of the most widely used methods for the additive production of metal products is selective laser melting. To melt the metal in the form of a powder, use a ytterbium fiber laser with a power of 200 to 1000 W, the radiation of which with the help of mirrors on a high-speed drive is focused to the required place. The subject of research was the possibility of creating products from the heat-resistant alloy INCONEL 718 by the method of layer-by-layer fusion on the equipment produced by LLC «Additive Laser Technology of Ukraine». The material for research was a test sample made by the SLM method (laser selective melting) by layer-by-layer fusion of the metal powder of the heat-resistant alloy INCONEL 718 with the laser beam. Research methods: microstructural analysis by light microscope Carl Zeiss AXIOVERT M200 MAT, particle size analysis by scanning electron microscope REM 106, the microstructure was detected by etching in CuSO4 + HCl. Objective: to establish the possibility of manufacturing a high-quality sample of alloy INCONEL 718, the study of its porosity and microstructure as the main indicators of print quality. Results: it was found that the equipment produced by LLC «Additive Laser Technology of Ukraine» allows to implement the SLM process and to manufacture products from INCONEL 718 alloy with high metal density. The study of the microstructure in the planes parallel and perpendicular to the direction of sample construction was performed. Conclusions: additive technologies are promising for the creation of parts and structures for aerospace technology, allowing to reduce the time and cost of their design and creation. The possibility of creating high-quality products from INCONEL 718 alloy using the SLM method at the installation of the production of LLC «Additive Laser Technology of Ukraine» (Dnipro) is shown. The interrelation of process parameters and microstructure is shown, which necessitates the development of reasonable SLM process modes for products for various purposes

scholarly journals Metallothermic Al-Sc Co-Reduction by Vacuum Induction Melting Using Ca

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1223 ◽  
Author(s):  
Frederic Brinkmann ◽  
Carolin Mazurek ◽  
Bernd Friedrich
Keyword(s):  
Software Tool ◽  
Metal Extraction ◽  
Vacuum Induction Melting ◽  
Vacuum Induction Furnace ◽  
High Tech ◽  
Induction Melting ◽  
Metallothermic Reduction ◽  
In Situ Extraction ◽  
Master Alloys

Due to its enhancing properties in high-tech material applications, the rare earth element Scandium (Sc) is continuously gaining interest from researchers and material developers. The aim of this research is to establish an energy and resource efficient process scheme for an in situ extraction of Al-Sc master alloys, which offers usable products for the metallurgical industry. An AlSc20 alloy is targeted with an oxyfluoridic slag as a usable by-product. The thermochemical baseline is presented by modelling using the software tool FactSage; the experimental metal extraction is conducted in a vacuum induction furnace with various parameters, whereas kinetic aspects are investigated by thermogravimetric analysis. The Sc-containing products are analyzed by ICP-OES/IC concerning their chemical composition. Optimum parameters are derived from a statistical evaluation of the Sc content in the obtained slag phase. The material obtained was high in Ta due to the crucible material and remarkably low in Al and F; a comparison between the modelled and the obtained phases indicates kinetic effects inhibiting the accomplishment of equilibrium conditions. The formation of a Sc-rich Al-Sc phase (32.5 wt.-% Sc) is detected by SEM-EDS analysis of the metal phase. An in situ extraction of Al from Ca with subsequent metallothermic reduction of ScF 3 as a process controlling mechanism is presumed.

EFFECT OF VACUUM INDUCTION MELTING TECHNOLOGY ON MECHANICAL PROPERTIES OF Nb-16Si-22Ti-2Al-2Hf-17Cr ALLOY

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2940-2945 ◽  
Author(s):  
XIAOJIAN LI ◽  
HU ZHANG ◽  
JIANGBO SHA
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Compressive Strength ◽  
Room Temperature ◽  
Vacuum Induction Melting ◽  
Vacuum Induction Furnace ◽  
Induction Melting ◽  
Arc Melting ◽  
Temperature Fracture ◽  
High Temperature Compressive Strength

This paper dealt with the effect of different induction melting technologies on mechanical properties of Nb -16 Si -22 Ti -2 Al -2 Hf -17 Cr alloy. The cast ingots were fabricated first by arc-melting, and then remolten in the vacuum induction furnace. The results showed that the ingot with refining process of 1800°C/15min and 0.1 at% C addition had finer microstructure and higher room-temperature fracture toughness. In addition, the compressive strength of the ingot with refining technology of 1700°C/10min was 315MPa at 1250°C. However, the arc melting ingot had the lowest fracture toughness and high-temperature compressive strength.

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