Details

Autor(en) / Beteiligte

• Shimizu, Fumiyuki
• Yano, Toshihiro
• Umemoto, Yasushi
• Yukawa, Yasumasa

Titel

Electron Beam Cold Hearth Melting and Refining (EB-CHR) of Refractory Metals

Ist Teil von

• ISIJ International, 1992/05/15, Vol.32(5), pp.656-663

Ort / Verlag

The Iron and Steel Institute of Japan

Erscheinungsjahr

1992

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Electron beam cold hearth melting and refining (EB-CHR) of refractory metals (Nb, Mo, Ta) and an alloy (Nb-1%Zr) was examined for its ability to produce homogeneous materials in the 2 000 and 400 kW EB-CHR furnaces and the 70 kW EB furnace. Behavior of gaseous elements was discussed with taking the volatile parameter R into the consideration. In the production of Nb-1%Zr in the 400 kW EB-CHR furnace, zirconium content was controllable. No serious segregation was found. These results show that the mechanism of zirconium loss in the EB-CHR process depends on both the evaporation and segregation of zirconium. Heat balance in molybdenum melting was measured in the 2 000 kW EB-CHR furnace. The obtained heat efficiency was about 70% and energy loss of EB agreed with the ratio of backscattered electron energy to whole EB well energy input, which is about 30%. Mechanical processing tests involving forging, hot-rolling and cold-rolling were carried out. Material property such as workability was evaluated. EB-CHR processed materials gave better workability than others. Plates and sheets of some refractory metals were successfully produced.