ORNL-1816 - the Molten Salt Energy Technologies Web Site

ANP QUARTERLY PROGRESS REPORT
fabricability of the cast alloy is associated with
a second phase which persists after long-time heat
treatments at 21OOOF.
New Alloys
H. lnouye J. H. Coobs
Metallurgy Division
Several new alloys are being studied in an attempt
to find an alloy that is superior to Hastelloy B,
l and efforts are being made to improve the existing
ys. Preliminary results of experiments
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arious compositions are presented
Hastelloy B Plus 0.03% Cerium. A 3-lb vacuum
melt was rolled at 21OO0F, and there was con-
siderably less cracking than would have been
found with Hastelloy B. Numerous small defects
ere present, however, that may be eliminated by
increasing the cerium content of he alloy.
ybdenum-Columbium-Nickel Alloy. A 20%
Cb-75% Ni alloy could be cold rolled from
the cast structure to sheet. The structure is twophased
at 1500OF and single-phased at a solution
annealing temperature of 195OOF. The tensile
strength of the alloy at 1500°F is 36,800 psi
(elongation 3.5%). A creep test at a temperature
of 1500OF and a stress of 8000 psi is in progress.
Molybdenum-AluminumNickel Alloy. A 20%
Mo-2% AI-78% Ni alloy could be rolled at room
temperature from the cast condition. At 1500OF
the tensile strength was 43,500 psi with an elongation
of 5%.
Molybdenum-Nickel Alloy. A 100-g arc melt of
a 24% Mo-76% Ni composition was hot rolled
60% at 220OOF. Following a 1-hr anneal at 21OO0F,
the alloy was cold rolled 72% without cracking.
The work hardening data for the alloy are listed
Cold Work (%) HardnessVPN (20-kg load)
, Annealed
200
25
347
29.6 40 1
423
60.4
72.0
432
483
470
A 3-lb vacuum melt of this alloy has been rolled
to sheet and will be screened for strength and
ductility in creep and tensile tests. In addition,
an extrusion of the alloy has been rolled to sheet
for obtaining more detailed data.
A 100-9 arc melt ofa 32% Mo-68% Ni composition
was successfully hot rolled 60% at 22OOOF. The
alloy was further cold rolled 72% without cracking.
The work hardening data for the alloy are listed
below:
Cold Work (%) Hardness V PN (20-kg load)
Annealed 23 1
21
386
31
444
41 47 1
54
513
62
502
72
516
A 3-lb vacuum melt of the alloy has been rolled
to 0.063-in. sheet and is being machined into
creep and tensile test specimens.
A 100-9 arc melt of a 38% M0-62% Ni compo-
sition was rolled60% at 2200OF. The alloycracked
when cold rolled. In the annealed condition the
hardness of the alloy is 396 VPN. The micro-
structure of the cast alloy shows a considerable
quantity of eutectic, which appears to be similar
to that found in Hastelloy B.
The following additional arc-melted alloys were
evaluated:
Alloy Results
75% Ni-20% Mo-5% AI Cracked during hot rolling
70% Ni-20% Mo-10% Cb Slight edge cracking during
hot rolling, further cold
rolled to sheet without
difficulty
78% Ni-20% Mo-2% V Successfully hot rolled and
cold rolled to sheet with
no visible flaws
78% Ni-20% Mo-2% Zr Moderate amount of cracking
during hot rolling that be-
came progressively more
severe during cold rolling
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