Automatic Welding, 2018, №10



2018 №10 (02)

DOI of Article 10.15407/as2018.10.03

2018 №10 (04)

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Avtomaticheskaya Svarka (Automatic Welding), #10, 2018, с. 17-26
 

Effect of surface-active elements on the formation of crystalline cracks

V.A. Anoshin, V.M. Ilyushenko

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

Based on the analysis of physicochemical properties of harmful impurities, the notions about the mechanism of their effect on the formation of crystalline cracks in different metals are summarized, which consist, firstly, in their enrichment of crystallite boundaries (residual liquid) at the last stages of solidification and, secondly, in revealing the effect of adsorption reduction of strength and ductility. The difference in the character of solidification of single-phase and two-phase (with eutectic) alloys in the enrichment of crystallite boundaries with harmful impurities was established. It is shown that the specific surface energy at the interface solid metal – melt and grain boundaries have the greatest effect on cracks formation. It was established that also surface-active alloying elements, characterized by the same physicochemical properties as harmful impurities, can influence the increased tendency to crystalline cracks formation. The formula for subcritical crack growth, proposed by E.E. Glikman et al. can serve as a criterion for evaluation of the effect of surface-active elements on the formation of crystalline cracks. 36 Ref., 2 Tabl., 9 Fig.
Keywords: crystalline cracks, harmful impurities, physicochemical properties, effect of adsorption reduction of ductility and strength, distribution coefficient, enrichment of grain boundaries, state diagram, crystalline pattern, eutecticAvtomaticheskaya Svarka (Automatic Welding), #10, 2018, с. 17-26

Received: 10.09.2018
Published: 25.10.2018

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