2017 №02 (05) DOI of Article
2017 №02 (07)

Electrometallurgy Today 2017 #02
Electrometallurgy today, 2017, #2, 35-44 pages
Modeling of metallurgical additive process of manufacture of 09G2S steel structures
G.M. Grigorenko, V.A. Kostin, V.V. Zhukov
E.O. Paton Electric Welding Institute, NASU. 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
Presented are the results of modeling the thermal fields, stresses, deformations and displacements in formation of additive structures of steel 09G2S on substrate. To carry out the computer modeling, a calculation package of interdisciplinary investigations COMSOL Multiphysics was used. In the work the effect of temperature on steel physicalchemical parameters was taken into account. Results for modeling were obtained by using a complex Gleeble 3800 of simulation of thermodeformational state of a thermal cycle of metal welding under the action of tension (coefficient of linear expansion) and unit VDTA-8M of high-temperature thermal analysis (heat capacity, heat conductivity). The carried out investigations showed that at the additive deposition of steel 09G2S layers on substrate the highest level of residual stresses and deformations is reached at the interface of the first layer and substrate and amounts to 280…320 MPa. The stresses between the deposited metal layers are significantly lower (to 50 MPa). It was found that with increase in the number of depositing layers the level of stresses at the additive layer/substrate interface is increased and does not depend with time on the deposited layer number. During the additive process it is necessary to apply the preheating up to temperatures of not lower than 300…320 oC to prevent a noticeable deformation of the substrate. The developed software can be used for the mathematical modeling of the additive process of formation of structures of steels, titanium and aluminium alloys. Ref. 13, Table 1, Figures 7.
Keywords: additive production; modeling; steel; deposition; stress; microstructure


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