抄録
Vacuum arc remelting with rectangular mold was tried in order to reduce the cost of producing titanium sheet and plate. Compact electrodes and solid ones were melted with a mold designed to have the proportion of wide side length to the narrow of 1.5 and the round inner corners. The conditions of melting and the quality of ingots were investigated, and the following results were obtained.
(1) Melting aspects are the same as those with round mold, and there is no problem in melting compact electrode.
(2) There is no difference between heat fluxes at the wide side, the short side and the corners of mold, and those are the same as the heat flux at the round mold too. As the result, the thickness of solidified shell is uniformed.
(3) Distributions of [Fe] and [O] in the ingot are as homogeneous as those in round ingot.
(4) Surface quality of the ingot from a solid electrode is good enough, even in hot rolled plate from the ingot without conditioning, however only a few sharrow defects within 0.3 mm depth are detected.
