Author: W. H. JohnsonPublisher:
ISBN:
Category : Heat resistant alloys
Languages : en
Pages : 42
Book Description
Melting and Casting of the Refractory Metals Molybdenum, Columbium, Tantalum, and Tungsten
Author: W. H. JohnsonPublisher:
ISBN:
Category : Heat resistant alloys
Languages : en
Pages : 42
Book Description
Structural Considerations in Developing Refractory Metal Alloys
Author: R. I. JaffeePublisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 36
Book Description
Progress made in applying advanced techniques and structural concepts to the problem of strengthening the Group VI-A metals, Cr, Mo, and W, is examined. At low temperatures, T/Tm
The Engineering Properties of Tantalum and Tantalum Alloys
Author: F. F. SchmidtPublisher:
ISBN:
Category : Tantalum
Languages : en
Pages : 134
Book Description
This report presents the results of a state-of-the-art survey covering tantalum and seven of its alloys. All data are given in tabular and graphical form covering some of the more important physical, mechanical, and metallurgical properties for each material. References are given at the conclusion of each material section.
Properties of Coated Refractory Metals
Author: W. A. GibeautPublisher:
ISBN:
Category : Heat resistant alloys
Languages : en
Pages : 104
Book Description
This report summarizes the information generated since the middle of 1961 on the chemical, physical, and mechanical properties of refractory metals that are coated with oxidation-resistant coatings of advanced-experimental or commercial status. It is a supplement to DMIC Report 162, Coatings for the Protection of Refractory Metals from Oxidation, dated November 24, 1961. Recent data on specific silicide- and aluminide- type coatings for columbium, molybdenum, tantalum, and tungsten and their alloys reflect general advances in coating quality and performance, understanding of the behavior of coated systems, and more complete realization of the problems associated with the use of coated hardware.
The Effect of Fabrication History and Microstructure on the Mechanical Properties of Refractory Metals and Alloys
Author: Albert G. ImgramPublisher:
ISBN:
Category : Heat resistant alloys
Languages : en
Pages : 80
Book Description
This report summarizes the present knowledge concerning the relationship among fabrication history, metallurgical structure, and the mechanical properites of the refractory metals columbium, tantalum, bolybdenum, and tungsten, and their alloys. These are the refractory metals currently reveiveing the most attention for aerospace applications, and are therefore the materials considered in this survey. The report is organized into three main sections, titled ''Fabrication'', ''Microstructure and Alloying'', and ''Interstitial Impurities''. The data presented were selected as those which best illustrate the topics discussed. Descriptions of the metaljurgical principles involved are included. Suggestions for optimizing mechanical properties by controlling metallurgical structure are made where possible. (Author).
The Application of High Pressure in Metal-deformation Processing
Author: F. W. BoulgerPublisher:
ISBN:
Category : Hydrostatic pressure
Languages : en
Pages : 82
Book Description
On October 3, 1963, a symposium was sponsored by the Bureau of Naval Weapons, Metalworking Processes and Equipment Program, on the application of high pressure in metal-deformation processing. Past research has shown that superimposed hydrostatic pressure can significantly increase the ductility at fracture of various materials. These observations have stimulated considerable interest in applying this hydrostatic-pressure effect to metal deformation processing, where it was anticipated that improved ductility and fabricability of brittle materials could be realized. Hydrostatic extrusion and hydrodynamic compressive forging were two such fabrication techniques discussed at the symposium, and preliminary results were found to be encouraging. Another fabrication process that will be investigated in the near future is sheet drawing, where the effect of superimposed pressure improves the ductility to fracture, it was noted that pressure cycling did not improve either the strength or ductility of steels containing various amounts of carbon. In addition to the mechanical-property effects, hydrostatic pressure has been found to affect measurably, numerous metallurgical properties of metals and alloys. (Author).
Joining of Nickel-base Alloys
Author: R. M. EvansPublisher:
ISBN:
Category : Brazing alloys
Languages : en
Pages : 86
Book Description
NASA Technical Note
Author: Nuclear Science Abstracts
Author: Cracking in High-strength Steel Weldments
Author: P. A. KammerPublisher:
ISBN:
Category : Steel
Languages : en
Pages : 132
Book Description
Weldment cracking is a broad complex field. Even if one considers only cracking of steel weldments, the problems range from cracking at temperatures near the solidus during welding to cracking at room temperature days, weeks, or months after welding is completed. Numerous reports of investigations in this field are contained in the published and unpublished literature. However, most of these reports cover only a particular problem in a specific area of the broad field of weldment cracking. This review attempts to cover the major aspects of the entire field of weldment cracking. Necessarily, the review is for the most part general, only being specific in a few instances to illustrate a point. (Author).