ORNL-1771 - Oak Ridge National Laboratory

PERIOD ENDING SEPTEMBER JO, 1954
Fig. 2.5. Inside Surface of lnconel Sleeve Enclosing Beryllium Insert Exposed in Whirligig Test to
Sodium for 300 hr at 1300°F. Etched with glyceria regia. 1OOOX.
TABLE 2.8. EFFECT OF CIRCULATING SODIUM AT VARIOUS TEMPERATURES FOR 500 hr IN
INCONEL THERMAL-CONVECTION LOOPS WITH BERYLLIUM SPECIMENS IN THE HOT LEGS
.
.... ......
Tempera tu re
...... _____ ..... -~
.........
Metallographic Examination
. ~ .
(OF)
Beryllium Specimen lnconel Hot Leg
...... _ ............... ___ __ ............
____ __
1500 Outside surface of insert showed holes to a depth Deposit opposite the beryllium
of 14 mils; inside surface slightly rough insert
1300 Intergranular penetrations to a depth of 2 mils on No attack or deposii
outside surface; no attack on inside surface
1100 No layer or attack No attack or deposit
9 00 No layer or attack No attack or deposit
- __ ..................................... - ................ ___ ..
results reported in Table 2.8 are from tests oper-
ated for 500 hr. Other loops are now in operation
that will be run for longer periods.
.......
in the hot leg of the loop operated at 1500°F. The
deposit material has not yet been identified by
spectrographic or diffraction studies. The deposit
Photomicrographs of the outsides of the be- found on the lnconel opposite the beryllium insert
ryllium inserts are shown in Fig. 2.7. Black, in the loop operated at 1500°F is shown in Fig.
flaky material was found in the cold legs of the 2,8; it has been identified as a nickel-beryllium
loops operated at 1100, 1300, and 1500°F and alloy.
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