REACTOR TECHNOLOGY REPORT NO. 16-METALLURGY
Welding and Brazing. A resistance autobrazing process was developed for joining metallic probes to semiconductive thermoelectric materials. A dynamic method for measuring temperatures in heat-affected zones of Zircaloy-2 weldments was devised using W-Re thermocouples which can record peak temperatures up to 1600 deg 30 deg C. Four brazing alloys for joining Inconel to Inconel were evaluated, and data are presented on their tensile properties, corrosion, and optimum brazing temperatures. Structural Materials. The results of an evaluation of a cast Inconel bottom transition piece are reported. Preliminary results are also reported for arc-melting of Na-reduced Zr sponge to produce a Zircaloy-2 ingot. Hydrogen pickup in Zr alloys by Sieverts apparatus or aqueous corrosion was found not to affect the appearance and distribution of hydrides in the alloys. Investigations were carried out on the aqueous corrosion resistance and high-temperature strength of modifications of the Zr-2 at.% Sn-2 at.% Nb alloy. Studies were made on the aging kinetics of Zr-Nb alloys in order to understand the mechanism of omega phase decomposition and the effects of 02. Mechanical Properties of Structural Materials. The hardnesses of a large number of highstrength Zr alloys were measured at elevated temperatures. The fatigue strength of Zircaloy-2 weld metal was determined. Repeated shock tests were carried out on 17-4 pH steel to determine their effects on the steel plastic deformation. The tensile properties of vacuum-melted Inconel were found to be nearly the same as those for the airmelted material. The effect of neutron irradiation on the null ductility transition temperature of structural steels was found to follow a linear law on a semilog plot. Fuel and Control Materials. The results of fabrication of Sm, Eu, Gd, Dy, and Er strips are given. Procedures are described for preparing very dilute alloys of U in Zr for use as standards for alpha counting. The results of an attempt to produce Hf flat bar from arc-melted Hf sponge are reported. Theoretical relationships for thermal conductivity in aggregates are discussed. (D.L.C.)
- Research Organization:
- Knolls Atomic Power Lab., Schenectady, N.Y.
- DOE Contract Number:
- W-31-109-ENG-52
- NSA Number:
- NSA-15-026472
- OSTI ID:
- 4004384
- Report Number(s):
- KAPL-2000-13
- Country of Publication:
- United States
- Language:
- English
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