ORNL-1816 - the Molten Salt Energy Technologies Web Site

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ANP QUARTERLY PROGRESS REPORT Fig. 7.3. NaK-to-Air Radiator with Hastelloy 6 Tubing and Manifolding and a Sin. Section of High-Conductivity Copper Fins Spaced 15 Fins per Inch. 106 Mechanical Properties Studies R. B. Oliver D. A. Douglas J. H. DeVan J. W. Woods Metallurgy Division M. D'Amore Pratt & Whitney Aircraft The stress-rupture properties of the nickel- molybdenum base alloys are being studied in fused salts, sodium, and various gases. Six new lever arm machines are being used to testHastelloy B sheet specimens, and eight additional tube burst units have Hastelloy B pipe in test. It is anticipated that design curves for properties in the fused salts at 1500 and 165OOF will be available by February 1955. Data are also being obtained for a design curve for properties in argon. The results obtained in argon at 15OOOF are presented in Table 7.4. As Table 7.4 indicates, Hastelloy B has sub- stantially greater strength at 15OOOF than Inconel, which will rupture in 1200 hr when stressed to 3500 psi. A Hastelloy B specimen tested in hydrogen at 12,000 psi ruptured in 1300 hr; a similar time to rupture was found in argon. Thus there is an indication that Hastelloy B may not be sensitive to a hydrogen atmosphere when tested in the so- l ution-annealed condition. TABLE 7.3. EFFECT OF AGING TIME ON ROOM-TEMPERATURE BEND DUCTILITY OF WROUGHT HASTELLOY B Time at Bend Angle Before Fracture (deg) 150OoF b (hr) As-Received Specimen ' Heat-Treated Specimen 0 25 50 75 100 200 223 300 Greater than 135,c no fracture Greater than 135, fissuring evideni 92, complete fracture 90, complete fracture 84, complete fracture 80, complete fracture 76, complete fracture 80, complete fracture 'Solution annealed at 215OOF and quenched. 1 Greater than 135, no fracture Greater than 135, no fracture Greater than 135, no fracture Greater than 135, no fracture Greater than 135, no fracture 90, complete fracture 82, complete fracture 75, complete fracture bHeat treated in hydrogen for /2 hr at 215OoF and then for 30 hr at 195OOF followed by water quench. CMaximum bend angle available with apparatus. i - * a . -
TABLE 7.4. STRESS-RUPTURE PROPERTIES OF HASTELLOY B IN ARGON AT 1500°F Stress Time to Rupture Elongation (psi) (hr) (%I 15,000 157 45.0 13,500 180 15.0 12,000 1150 20.0 8,500 2200* 4.0 *Specimen stili in test. The new alloys being developed are also tested for stress rupture at 150OOF in argon in order to check the effect on strength which results from the various modifications. The results of tests made to date are presented in Table 7.5. These modified alloys show a decrease in high-temperature strength and elongation in comparison with Hastelloy B in the solution-annealed condition. SPECIAL MATERIALS FABRICATION H. lnouye .J. H. Coobs Metallurgy Division Duplex Tubing The efforts to produce duplex seamless tubing that will have good oxidation resistance on the outer surface and good corrosion resistance on the inner surface have continued. In the previous reportt3 tests were described in which hot-rolled and hot-pressed composites were deep drawn. 3J. H. Coobs and H. Inouye, ANP Quar. Prog. Rep. Sept. IO 1954, ORNL-1771, p 123. PERIOD ENDING DECEMBER 70, 7954 tubing is now being used in which the composite bi I lets are extruded. A study of the flow of metals during an impact extrusion is being made. For the study, the effect of the shape of the nose of the extrusion billet was determined on extrusions of Zircaloy ccinned in copper and extrusions of vanadium canned in steel. In addition, a two-ply and a three-ply billet of stainless steel-carbon steel were extrud'ed, but the extrusions have not yet been evaluated. The results of the tests show that largegrained billets, such as cast billets, produce 12 rough interface between the outer cladding and the core. A tapered nose on the can and a square (edge on the core result in a short section of can material restricted to the front of the billet; thereafter, the core has a thin layer of the canning material on the surface. A square nose on the can and a tapered core result in a thin section of corle begin- ning very soon after the front of the extrusion and increasing in thicknesses toward the end of the extrusion. Boron Carbide Shielding Suitable compositions for the boron carbide shield for the ART heat exchanger are being developed by The Carborundum Company ancl by the Norton Company by using various noninetall ic bonding materials, including BN, Sic, and carbon, as well as those mentioned previo~sly.~ All these bonding materials have been used to some extent in fabricating useful forms of B,C. Another possible source for fabrication of these shield pieces is Sylvania Electric Products, Inc., which only recently became interested in the problem. In a recent conference with representatives of The Carborundum Company it was stated that they 11.0 8,000 510 7.0 t
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