2020 №06 (08) DOI of Article
2020 №06 (02)

Automatic Welding 2020 #06
Avtomaticheskaya Svarka (Automatic Welding), #6, 2020, pp. 3-10

The influence of introducing refractory compounds into the weld pool on the weld metal dendritic structure

V.V. Holovko, D.Yu. Ermolenko, S.M. Stepanyuk
E.O. Paton Electric Welding Institute of the NAS of Ukraine, 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

A study was conducted in order to expand the knowledge base on the mechanisms of the influence of refractory compounds in the weld pool on modification of weld metal structure. Results of experiments on inoculation of TiN, SiC, NbC, VC, TiC, TiO2, Al2O3, MGO, ZrO2 dispersed particles to the liquid metal of the weld pool are given. Possibility of the influence of refractory inoculants as the melt «microcoolants», centers for epitaxial initiation of a new phase in the liquid metal and surface-active compounds on modification of the dendritic structure of the welds was analyzed. It is shown that under the conditions of welding low-alloyed steels by flux-cored wire of «metal core» type in shielding gas atmosphere, the refractory compounds, inoculated to the weld pool, the most actively influence modifying of the primary structure, as surface-active compounds. It is established that the change of dendrite morphology in the weld metal influences the temperature range of the recrystallization process, formation of secondary microstructure and mechanical properties of the welds. 10 Ref., 5 Tabl., 8 Fig.
Keywords: low-carbon steel, weld, refractory inclusions, dispersed particles, dendritic structure, modification, austenite grains

Received: 30.04.2020


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