Abstract
The properties of welded joints are largely determined by their phase composition and by the morphology of the structural components. For instance, in the investigation of welded joints it was established [i] that there is a correlation between the grain size of ferrite in a ferritic-pearlitic structure and the characteristics of failure, in particular the dimensions of transcrystalline cleavage facets. In high-strength steels, which are a promising material for pressure vessels, a predominantly bainitic-type structure forms in the nearseam zone under the effect of the thermal cycle of welding; the influence of this structure on the mechanism of failure has not been sufficiently studied.
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