ORNL-1816 - the Molten Salt Energy Technologies Web Site
ORNL-1816 - the Molten Salt Energy Technologies Web Site
ORNL-1816 - the Molten Salt Energy Technologies Web Site
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ANP QUARTERLY PROGRESS REPORT<br />
Fig. 7.3. NaK-to-Air Radiator with Hastelloy 6<br />
Tubing and Manifolding and a Sin. Section of<br />
High-Conductivity Copper Fins Spaced 15 Fins<br />
per Inch.<br />
106<br />
Mechanical Properties Studies<br />
R. B. Oliver D. A. Douglas<br />
J. H. DeVan J. W. Woods<br />
Metallurgy Division<br />
M. D'Amore<br />
Pratt & Whitney Aircraft<br />
The stress-rupture properties of <strong>the</strong> nickel-<br />
molybdenum base alloys are being studied in<br />
fused salts, sodium, and various gases. Six new<br />
lever arm machines are being used to testHastelloy<br />
B sheet specimens, and eight additional tube<br />
burst units have Hastelloy B pipe in test. It is<br />
anticipated that design curves for properties in<br />
<strong>the</strong> fused salts at 1500 and 165OOF will be available<br />
by February 1955. Data are also being obtained<br />
for a design curve for properties in argon. The<br />
results obtained in argon at 15OOOF are presented<br />
in Table 7.4.<br />
As Table 7.4 indicates, Hastelloy B has sub-<br />
stantially greater strength at 15OOOF than Inconel,<br />
which will rupture in 1200 hr when stressed to<br />
3500 psi. A Hastelloy B specimen tested in hydro-<br />
gen at 12,000 psi ruptured in 1300 hr; a similar<br />
time to rupture was found in argon. Thus <strong>the</strong>re is<br />
an indication that Hastelloy B may not be sensitive<br />
to a hydrogen atmosphere when tested in <strong>the</strong> so-<br />
l ution-annealed condition.<br />
TABLE 7.3. EFFECT OF AGING TIME ON ROOM-TEMPERATURE BEND<br />
DUCTILITY OF WROUGHT HASTELLOY B<br />
Time at<br />
Bend Angle Before Fracture (deg)<br />
150OoF<br />
b<br />
(hr) As-Received Specimen ' Heat-Treated Specimen<br />
0<br />
25<br />
50<br />
75<br />
100<br />
200<br />
223<br />
300<br />
Greater than 135,c no fracture<br />
Greater than 135, fissuring evideni<br />
92, complete fracture<br />
90, complete fracture<br />
84, complete fracture<br />
80, complete fracture<br />
76, complete fracture<br />
80, complete fracture<br />
'Solution annealed at 215OOF and quenched.<br />
1<br />
Greater than 135, no fracture<br />
Greater than 135, no fracture<br />
Greater than 135, no fracture<br />
Greater than 135, no fracture<br />
Greater than 135, no fracture<br />
90, complete fracture<br />
82, complete fracture<br />
75, complete fracture<br />
bHeat treated in hydrogen for /2 hr at 215OoF and <strong>the</strong>n for 30 hr at 195OOF followed by water quench.<br />
CMaximum bend angle available with apparatus.<br />
i -<br />
*<br />
a<br />
.<br />
-