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Electron Beam Melting Beta III Titanium Alloy.
COLT INDUSTRIES INC PITTSBURGH PA CRUCIBLE RESEARCH CENTER
Electron beam melting is a theoretically attractive method for producing Beta III titanium alloy Ti-11.5Mo-6.0Zr-4.5Sn ingots free from incompletely melted molydbenum. Two approaches were investigated 1 direct E. B. melting of the titanium alloy, followed by vacuum-arc remelting and 2 an indirect approach employing an E. B. melted Mo-Zr master alloy. Product inspection showed the master alloy approach to be most unsatisfactory because of marginal meltability, with the resulting risk of brittle inclusions and the survival of many unmelted molybdenum particles. Direct E. B. melting was found to be more promising, but less satisfactory than the proprietary are melting practice now being used for the alloy. The mill processing of E. B. melted Beta III ingots to strip, bar and rod is discussed. Mechanical test data on strip, bar and rod produced by both E. B. melt methods are presented. Author
Final rept. 1 Jun 68-31 Jul 70,