The Paton Welding Journal, 2016, №12



2016 №12 (02)

DOI of Article 10.15407/tpwj2016.12.03

2016 №12 (04)

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The Paton Welding Journal, 2016, #12, 13-20 pages
 

Direct numerical Modelling of formation of weld metal dendrite structure with disperse refractory inoculants

D.Yu. Ermolenko, A.V. Ignatenko And V.V. Golovko

E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
Abstract
Studied were the advantages of alloy feeding with the disperse refractory inoculants for regulation and optimizing the primary structure of high-strength low-alloy steel weld metal. The main assumptions and limitations of a model of weld metal solidification process, proposed in this work, were considered. The model of melt solidification was described in details taking into account effect of the introduced disperse refractory inoculants. A hypothesis was presented on mechanism of interaction of a refractory inoculant with moving solidification front, which was taken in computations. Effect of the different alloying elements on surface energy of phase interface was described. Boundary conditions of the proposed model, realized in form of author software, were described. The results are given of computational experiments showing the possibilities of regulation of parameters and morphology of the primary structure of high-strength low-alloy steel weld metal by means of melt feeding with the disperse refractory inoculants (by example of TiO₂ introduction). Presented is a comparison of experimental and computational results of change of the primary structure parameters. Developed mathematical model and software, written on its basis, are good for prediction of dimensional parameters and morphology of the weld metal primary structure considering refractory inoculants being fed in the weld pool. 17 Ref., 1 Table, 10 Figures.
 
Keywords: dendrite structure, disperse refractory inoculants, solidification, high-strength low-alloy steels, morphology, mathematical modelling
 
 
Received:                26.10.16
Published:               24.01.17
 
 
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