Polishko G. Peculiarities of ingots enlargement by sequential circle Electroslag Surfacing.

In this work the possibility of forming huge homogeneous heavy forged ingots with a view to their enlargement by sequential circle Electroslag Surfacing by means of Liquid Metal (ESSE LM process) was theoretically justified and experimentally confirmed for the first time. Based on comprehensive studies using mathematical modeling of ESSE LM sequence and results of experimental studies of ESSE LM process thermal cycles were calculated and physically modeled using modern research complex Gleeble 3800 with a fully digital thermal testing system, which allowed to evaluate the efficiency of the sequential circular ESSE LM and influence of its thermal cycle on the structure of the fusion area for enlargement of large high-alloy steels and alloys similar to 316L while providing disperse homogeneous dendrite structure of cast metal. The thesis is dedicated to the investigation of possibilities for applying sequential ESSE LM for enlargement of huge steel ingots using model ingots that were obtained in the laboratory. As a result of defining peculiarities of the formation of huge steel ingots by the sequential circular ESSE LM issued technological advice on developing the concept of ESSE LM furnace for huge ingots with diameters from 1400 to 3200 mm and weighing 300 tons, and the sequence of main manufacturing operations of their production. Keywords: enlargement by sequential Electroslag Surfacing by means of Liquid Metal (ESSE LM), high-alloy steels, huge ingots and model ingots, fusion zone, thermal cycle of ESSE LM, dispersed dendrite structure, physical and mechanical properties, impact strength.