REDUCTION AND CONSOLIDATION OF SUPERIOR QUALITY MOLYBDENUM ALLOYS
Abstract
Heat treating studies on single crystals swaged 95% at 800 F indicated a recrystallization temperature between 1200 and 1300 F after one-half hour at temperature. This is the lowest recrystallization temperature reported for molybdenum and is attributed to the high purity obtainable by electron-beam melting. Three electron-beammelted, hydrogen-reduced molybdenum billets were extruded. Sheets rolled to .030 inch from these extrusions had recrystallization temperatures between 1200 and 1400 F. Room temperature tensile properties of the sheet showed a large dropoff in strength after a one-hour heat treatment at 1400 F. Elongation values for this material were between 30 and 40%. A one-hour heat treatment at 1800 F resulted in a sharp drop in tensile elongation. Bend test data revealed brittle fracture after the one-hour heat treatment at 1400 F. Electron-beam melted, hydrogen-reduced molybdenum which was arc melted to refine the grain size showed properties similar to commercial molybdenum. The recrystallization temperature for this material was in excess of 1800 F. This increase in recrystallization temperature is attributed to contamination during arc melting. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 30, 1961
- Accession Number
- AD0284814
Entities
People
- James Wong
- Socrates S. Christopher