超合金,ステンレス鋼のEB溶解における成分挙動について

概要

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Superalloy (Inconel 718) and stainless steel (SUS 316) were melted by using 300kW Electron Beam (EB) melting furnace and the evaporation behavior of elements and the effect of purification were investigated.1) The evaporation behavior could be explained well by a Langmuir evaporation equation under the consideration of the vapor pressure of element and the activity in metal.2) The uniformalization of the chemical composition in the longitudinal direction can not be expected because the molten pool is not so deep, and so the accurate control of EB condition is important.3) In the investigation on mechanical properties of Inconel 718, creep rupture properties of EB melted material were better than those of VAR remelted material, which is considered to be caused by the purification of EB melted ingot.
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