THE EFFECTS OF HEAT-TREATING AND TESTING ENVIRONMENTS ON THE PROPERTIES OF REFRACTORY METALS,
Abstract
Studies on the effects of heat-treating and testing environments for the refractory metals have been limited primarily to the unalloyed metals and a few alloys of columbium and molybdenum. Most of this work has relied on compositional changes as a means of assesing the effects of various environments on these materials. It has been shown that all of these materials are subject to contamination or purification in various test environments. The residual gases H2, CO(or N2), and H20, constitute the major sources of contamination when testing columbium and tantalum materials in vacua. Under the same conditions, molybdenum and molybdenum alloys containing carbon and reactive-metal additions are subject to serious decarburization. Nonreactive gaseous atmospheres also cause serious changes in material chemistry, since small quantities of noxious gases are contained in the atmosphere. Several promising methods of circumventing material chemistry changes during various longtime, high-temperature exposures are being used and/or evaluated. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 20, 1964
- Accession Number
- AD0607481
Entities
People
- D. J. Maykuth
- F. F. Schmidt
- H. R. Ogden
Organizations
- Battelle Memorial Institute