Electrometallurgy Today, 2018, №01



2018 №01 (02)

DOI of Article 10.15407/sem2018.01.03

2018 №01 (04)

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Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2018, #1, 17-27 pages
 

Mathematical modeling of process of formation of multilayer 3D structure by additive method using electric arc heat sources

V.A. Kostin, G.M. Grigorenko, V.A. Shapovalov, A.N. Pikulin

E.O. Paton Electric Welding Institute of the NAS of Ukraine.
11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

The results of simulation of temperature fields, kinetics of deposition of layers of dissimilar metals and the character of structural transformations during the formation of an additive multilayer structure of 17G1S and 30XGS steels are presented. For the computer simulation, the COMSOL Multiphysics calculation package was used. The effect of temperature on the thermophysical parameters of steels was taken into account. The simultaneous effect of three arcs on the process of formation of deposits, kinetics of structural transformations and the diffusion processes of the redistribution of alloying elements was studied. It is shown that to reduce the stress level between additive deposit and substrate up to 50 MPa it is necessary at the beginning of the deposition process to apply the preheating of substrate by arc without application of material being deposited and also to keep the time of passing between the adjacent arc heat sources in the range from 5 to 30 s. It has been established that at low arc power (1 kW), a ferrite-bainite structure is predominantly formed in the deposit, the share of bainite in which is 71 % , 28 % ferrite, and about 1 % martensite. When using an arc of higher power (5 kW), a bainite-martensite structure is formed in the deposit, the share of bainite in which is about 50 %, the share of martensite increases to 40 % and ferrite — to 10 %. The increase in arc power leads to increase in maximum temperature of the molten pool to 1750...1850 ºC, increase in the cooling rate to 15...25 ºС/s and, as a result, increase in the share of martensite in the structure of the deposited layers. A software has been developed that can be used for mathematical modeling of the metallurgical additive process of forming products from various steels and alloys. Ref. 16, Tab. 2, Fig. 8.

Key words: additive production; modeling; deposition; functional materials; structural transformations; microstructure
 
Received:                22.01.18
Published:               20.03.18
 
 
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