Research and Development on High-pressure-high-temperature Metallurgy
Research and Development on High-pressure-high-temperature Metallurgy

Author:

Publisher:

Published: 1963

Total Pages: 90

ISBN-13:

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The phase diagram of the iron-silicon system was investigated at high pressure using alloys of varying silicon content up to 13.9a/o Si. The results of the investigati the Mo-C system were used to understand the relative stability of the monocarbides of molybdenum and to predict the high-temperature, high-pressure characteris tics of a cubic phase in the W-C system. In the attempted preparanoon of the intermetallic com pound, boron antimonide, techniques were devel oped to predict the crystal structure and the lattice constants of the anticipated compound. The predicted energy gap for BSb, zinc blends, is 2.5 e.v. The problem of microcracking in small specimens of low alloy steels austenitized and quenched at high pressure has been sodeed. The use of a liquid pressure transmitting medium has proved mandatory for the successful high pressure treatment of these specimens. (Author).

Research and Development on High-pressure High-temperature Metallurgy
Research and Development on High-pressure High-temperature Metallurgy

Author:

Publisher:

Published: 1963

Total Pages: 21

ISBN-13:

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Two separate high-pressure systems were designed, constructed and tested. Their successful use to pressures of 60 kilobars and temperatures up to 1500 C was demonstrated. It is anticipated that both of these systems will be utilized for high-pressure heat treatment of large specimens in the current high pressure program.

The Application of High Pressure in Metal-deformation Processing
The Application of High Pressure in Metal-deformation Processing

Author: F. W. Boulger

Publisher:

Published: 1964

Total Pages: 82

ISBN-13:

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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).