Research on the Effect of Selected Rare-Earth Scavengers on the Properties of Tungsten and Molybdenum (Quarterly Progress Report No. 1, 1 February 1962 through 30 April 1962)
- Univ. of Denver, CO (United States). Denver Research Institute
This research program is an investigation of a processing method designed to remove the interstitial oxygen and nitrogen from tungsten and molybdenum, and also to convert the grain-boundary films to less harmful forms. Minor additions of yttrium or a rare-earth metal are arc melted with the tungsten and molybdenum to act as scavengers of the oxygen and nitrogen and form stable, inert oxides and nitrides. An additional objective of the program is to achieve grain-refinement of the as-cast structure simultaneously with the scavenging action as a result of the formation of nuclei in the melt. Small-diameter ingots (7/8-inch) are melted in a continuous-casting, non-consumable electrode arc furnace using compacted powder charges. The ingots are machined and then formed into rod from which test specimens are machined. Recrystallized specimens are tested in torsion and by impact loading at various temperatures, and the ductile-to-brittle transition temperature is determined. The lowering of the ductile-to-brittle transition temperature is the criterion for ductility. Commercially produced molybdenum and tungsten rods are fabricated into test specimens to function as standards. Also, swaged and recrystallized arc-cast molybdenum, tungsten, and molybdenum -0. 5 percent titanium materials are included to provide additional base-line data.
- Research Organization:
- Univ. of Denver, CO (United States). Denver Research Institute
- Sponsoring Organization:
- National Aeronautics and Space Administration (NASA)
- NSA Number:
- NSA-17-014818
- OSTI ID:
- 4749249
- Report Number(s):
- DRI--2039; N6211513
- Country of Publication:
- United States
- Language:
- English
Similar Records
THE SCAVENGING OF TUNGSTEN AND MOLYBDENUM WITH SELECTED RARE EARTHS. Quarterly Progress Report No. 2, May 1, 1961-July 31, 1961
MOLYBDENUM AND THE EFFECTS OF MINOR ADDITIONS OF YTTRIUM
MECHANICAL PROPERTIES OF CHROMIUM. Period covered: April 1, 1956 to May 31, 1958
Technical Report
·
Tue Aug 01 00:00:00 EDT 1961
·
OSTI ID:4816142
MOLYBDENUM AND THE EFFECTS OF MINOR ADDITIONS OF YTTRIUM
Technical Report
·
Sun Dec 31 23:00:00 EST 1961
·
OSTI ID:4731362
MECHANICAL PROPERTIES OF CHROMIUM. Period covered: April 1, 1956 to May 31, 1958
Technical Report
·
Sun Jun 01 00:00:00 EDT 1958
·
OSTI ID:4292924