A method for measuring the spark-shower radiance of metals
when abraded on an abrasive grinding wheel was developed for
evaluating their sparking tendency. One hundred metals were tested
and rated relative to commercially pure iron. The radiance was
measured in units of energy per solid angle per area of the...
Exogenous and indigenous inclusions are defined and described
with respect to their origins and effects in cast steel. Means of
minimizing exogenous inclusions thru prevention of their formation
as well as entrapment in the mold filling system are discussed. Indigenous
inclusions arise from elements normally present in steel,
principally oxygen,...
Tungsten alloys containing approximately 0.75 and 2.3 vol pct Zr0₂
were prepared by powder metallurgical methods from blends
of commercial
tungsten powder and ZrW₂ powder.
A heat treatment of the extruded rods
at 1800°C was found to produce a stable structure with a
dispersion of
Zr0₂ particles in the tungsten...
High purity single crystals of zirconium were produced and
mechanically strained in the temperature range from 4.2°K to 293°K.
The crystals were produced by thermal treatment with a specially
constructed electron beam zone refiner which provided the abrupt
temperature gradient necessary for crystal growth. Specimens were
electrolytically machined to have...
High purity vanadium, both in the polycrystalline
and monocrystalline form, was strained in tension in
order to study the controlling deformation mechanism at
temperatures between 77 and 293°K. The temperature and
strain rate dependence of the flow stress for two grades
of material, 99.99% and 99.93%, was evaluated using temperature...
Relatively simple methods are developed for obtaining discreet
orientation characterization of preferred orientation from x-ray
diffraction-determined pole figure data. It is demonstrated how this
information, along with the single crystal elastic constants, can be
used to calculate Young's modulus as a function of sheet direction.
Computer programs are developed for...
A theoretical study of the heat and momentum transfer resulting
from a flow of power plant condenser effluent discharged vertically to
shallow, quiescent coastal receiving water is presented. The complete
partial differential equations governing steady, incompressible, turbulent
flow driven by both initial momentum and buoyancy are solved
using finite-difference techniques...