プラズマアークによる鋼および超合金の再溶解(<特集>鋼の特殊精錬)

概要

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The feature of plasma-arc remelting and the quality of plasma-arc remelted steels and superalloys were investigated by using an originally designed and constructed PPC (Plasma Progressive Casting) furnace with a 110mm dia. water-cooled copper mould and a maximum 150kW power source. The results obtained are as follows : 1) It was possible to some extent, to control the solidification structure of the PPC ingot. By selec ting a relatively slow melting rate against a given plasma power, the metal pool became very shallow and flat, so that columnar crystals grew nearly vertical. 2) The hot workability, based on the Gleeble test, of a solidification controlled PPC ingot, which had verical columnar crystals, was superior to that of VAR ingot. 3) No chemical composition change including for Ti, Al, Mn etc. was observed, and deoxidization could be done in the PPC process. As the deoxidizing mechanism, the C-O reaction and the removal of the Al_2O_3 type oxide inclusions were considered. 4) The ingot surface was comparable to that of ESR ingot, though some differences were observed between the steel grades. 5) The distribution of alloy elements in a PPC ingot and the mechanical properties of the ingot were almost the same as those of the VAR ingot.
社団法人日本鉄鋼協会の論文
1977-11-01