HIGH TEMPERATURE MATERIALS PROGRAM PROGRESS REPORT NO. 19, PART A
Stress-rupture results obtained with molybdenum at 2200 deg C in hydrogen and argon were essentially identical indicating little or no atmosphere effect. Previous data which indicnted longer rupture life (and increased creep resistance) in the argon tests were discourted because of tungsten contamination of the sample material during testing as revealed by chemical analysis. Identical results at 2200 deg C in both hydrogen and argon were obtained on two of the three differert heats of molybdenum employed in the stressrupture tests. The third heat exhibited much longer rupture life, particularly at a stress level of 1000 psi. The reason for this difference was not idertified but is probably caused by some material variability. The stress-rupture properties of tantalum at 2600 deg C were evaluated in two grades of argon and two grades of hydrogen. The stress-rupture life in argon was found to decrease as the dewpoint was decreased. Tungsten contamination was found on the surface of tantalum samples tested in the wet'' argon due, in all probability, to the transport of tungsten from the furnace heating element by the tungsten-water vapor cycle. There was no signiftcant difference noted in the tantalum stressrupture life test data obtained for tests conducted in commercial (2000 ppm impurities) and high purity grade hydrogen (5 ppm impurities). The preliminary experimental program on the refractory metals was initiated with the irradiation of several tungsten and molybdenum flat test specimens. Support equipment and furnaces for testing at high temperature in hydrogen or inert atmosphere or in vacuum are being assembled. Tensile data generated on Hastelloy X, and Rene' 41 is reported. The effects of irradiation on the stress rupture properties of overaged and underaged specimens of Rene' 41 are presented. Preliminary studies on the creep-rupture properties of Hastelloy X are illustrated in the form of specimen elongations as a function of testing time for various temperatures and stresses. Studies on the number of atom displacements in iron due to neutrons of various energies are discussed. The angular distribution of neutron scattering in iron and also the effect of the angle of neutron incidence on the medium are presented. The influence of material geometry on the number of atom displacements per unit flux is demonstrated by comparing the displacements in an iron column with those in an iron slab for various base widths and thicknesses. (auth)
- Research Organization:
- General Electric Co. Flight Propulsion Lab. Dept., Cincinnati
- DOE Contract Number:
- AT(40-1)-2847
- NSA Number:
- NSA-17-011087
- OSTI ID:
- 4713282
- Report Number(s):
- GEMP-19A
- Country of Publication:
- United States
- Language:
- English
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