Abstract
In order to provide for quality of large forgings we should work in several directions. Suppression of grain-boundary embrittlement by using appropriate heat-treatment regimes for large forgings has few prospects because of their slow cooling after tempering. Melting from a primogenital charge will eliminate the risk of grain-boundary fracture (exclude the Sb, Sn, and As admixtures). Though even the electroslag remelting of such metal eliminates coarse nonmetallic inclusions, we still have to suppress the consequences of the dendrite segregation, i.e., the formation of coarse upper bainite with large cementite plates between the axes, which causes cold brittleness. This can be accomplished by changing the hot deformation process, i.e., better control over the cast structure.
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