Nickel-manganese electroformed specimens and nickel-cobalt-manganese samples were heat treated at 343 C (650 F) for comparison of room temperature ductility with that observed for alloys heat treated at 315.6C (600 F). All heat treatments were for 24 hours. This heat treatment temperature increase generally did not result in significant improvements in ductility. However, increases in yield strength - with slight decreases in tensile strengths - were noted for the nickel-manganese and nickel-cobalt-manganese alloys. For the case of employing fairly high manganese contents in the electrolyte and countering ensuing high tensile  stress in the alloy by saccharin additions to the bath, it was noted that nickel-manganese alloys with over 0.4% by weight manganese retained high ultimate and yield strengths after the 343 C (650 F) heat treatment for 24 hours. Elongations were still lower than desired. For alloys with less than 0.4% by weight manganese this heat treatment provided excellent ductility, but very significant reductions in ultimate and yield strengths were noted

Malone, G. A.

English

NASA Technical Reports Server

CONTRACT HAS 8-3581?
STUDY OF HIGH PERFORMANCE ALLOY ELECTROFORMING
NINTH MONTHLY TECHNICAL. PROGRESS NARRATIVE
AUGUST 27, 198U TO SEPTEMBER 28, 198U
ELECTROFORKENG OPERATIONS DEPARTMENT
BELL AEROSPACE TEXTRON
POST OFFICE BOX ONE
BUFFALO, NEW YORK 1U2UO
BY
G. A. MALONE
OCTOBER 5,
PREPARED FOR:
GEORGE C. MARSHALL SPACE FLIGHT CENTER
MARSHALL SPACE FLIGHT CENTER, AL 35812
https://ntrs.nasa.gov/search.jsp?R=19840025494 2020-03-20T20:53:03+00:00Z
STUDY OF HIGH PERFORMANCE ALLOY ELECTRQFORMING
ABSTRACT
Nickel-manganese electroformed specimens and nickel-cobalt-manganese
samples were heat treated at 3^ 3°C (650°F) for comparison of room temperature
ductility with that observed for alloys heat treated at 315.6°C (600°F). All
heat treatments were for 2k hours. This heat treatment temperature increase
generally did not result in significant improvements in ductility. However,
increases in yield strength - with slight decreases in tensile strengths -
were noted for the nickel-manganese and nickel-cobalt-manganese alloys. For
the case of employing fairly high manganese contents in the electrolyte and
countering ensuing high tensile stress in the alloy by saccharin additions
to the bath, it was noted that nickel-manganese alloys with over Q.k% by
weight manganese retained high ultimate and yield strengths after the 3^ 3°C
(650°F) heat treatment for 2k hours. Elongations were still lower than
desired. For alloys with less than O.k% by weight manganese this heat
treatment provided excellent ductility, but very significant reductions in
ultimate and yield strengths were noted. A last series of specimens are
in test to (l) examine the effects of heat treatments at 3?1°C (?00°F) for
2k hours, (2) expand the test data for mechanical properties of nickel-
manganese alloys at lU9°C (300°F) and 260°C (500°F), and (3) provide compar-
ison mechanical property data for nickel-cobalt-manganese at these same
intermediate temperatures simulating service requirements on the Space
Shuttle MCC.
I. INTRODUCTION
The purpose of this work is to develop and demonstrate a system for
electroforming materials with improved strength and high-temperature prop-
erties. The Space Shuttle Main Engine employs a main combustion chamber
(MCC) where final combustion of propellent at high temperature and pressure
takes place. This critical component must be structurally supported by a
nickel-base alloy jacket. Producing this jacket from formed wrought metal
segments requires numerous weldments which alter the mechanical properties
of the base metal through heat affected zones. This requires thickening the
alloy where joints are to be made to meet the structural reouirements of the
shroud. The use of electroformable alloys with great strength would have
the potential for simplifying fabrication procedures for structural jackets
and reducing overall weight by removing weldments. Such an electroformable
alloy might also afford a possible use in advanced engines where light weight
and good strength at high temperatures are necessary.
II. TECHNICAL PROGRESS SUMMARY
A. Task I - Literature Survey (Phase A) - Completed previously.
B. Task II - Alloy Characterization and Optimization (Phase A)
The ten sets of nickel-manganese alloy panels reported as produced
last month in the progress narrative have been tested for mechanical propert-
ies as deposited and after various moderate heat treatments. Table I reports
these results. It should be noted that those specimens coded "NM" refer to
- 1 -
deposits from a bath without saccharin as a stress reducing additive. The •
somples coded "NMS" refer to deposits from a bath containing saccharin to
reduce stress. In the report of last month, we considered that certain
samples containing sulfur as a codeposit from the saccharin exhibited better
yield strengths up to a test temperature of 260°C (500°F) than normal "low"
sulfur deposits with higher manganese contents. Based on data in Table I of
this report, we can not confirm the beneficial effect of the sulfur. It
would appear that promising mechanical properties are obtained when the
sulfur induced by saccharin is below 100 parts per million by weight. The
mechanics behind this performance are not understood at this time. The high
"as deposited" properties are likely due to grain refinement characteristic
of deposits from a stress reduced bath.
It will be noted that the data in Table I is presented in order of
increasing manganese content in the deposits. Certain columns have been
included with no data. This will be updated during the next reporting
period. The data for the various heat treatments (not already performed)
will be of significant value prior to starting Task I of Phase B, Heat
Treatment of Alloy Structural Shells. This will complete all Phase A
investigations leading to the selection of one set of electroforming and
heat treating parameters for producing the sets of round test bars for
official evaluation by MSFC and ourselves.
Similar panels of nickel-cobalt-manganese alloy were tested for
mechanical properties after various heat treatments as shown in Table II.
These specimens are listed in order of increasing manganese content. For
this group of alloys the cobalt content was in the range of 5^ .1 ^  percent.
It will be noted that there is a gradual increase in ultimate and yield
strengths with increasing manganese content. The ductility improvement
with moderate heat treatments is excellent. The mechanical property test
results at lk9°C (300°F) and 260°C (500°F) should be available shortly. The
internal stress problem associated with this alloy may not be an insurmount-
able problem for shroud applications due to the mass strength of the nickel
electroform making up the outer shell of the main combustion chamber itself.
We still plan to produce stock of sufficient thickness to machine round
test bars from the nickel-cobalt-manganese alloy - if the intermediate
test temperature mechanical properties look good.
III. CimRENT PROBLEMS
Although the backlog of mechanical property testing was completed in
September, as planned, the additional testing at new heat treatment conditions
and with moderate test temperatures is progressing slowly due to an unexpected
workload in our metallurgical group. We expect to finish all flat strip
testing by the second week of November, at the latest. This will be necessary
if round bars are to be made and delivered by January 1985.
IV. WORK PLANNED
1. Confirm performance of latest sets of specimens showing useful
properties by testing at lU9°C (300°F) and 260°C (500°F).
- 2 -
Tabulate test data for those nickel-manganese and nickel-cobalt-
manganese alloy samples (and deposition parameters) showing
best combination of mechanical strength and ductility. Advise
MSFC personnel of results for final selections and recommend most
optimum parameters for duplication as round test bars.
V. FEJANCIAL DATA
See attached NASA Form 533P. Note that nominal expenditures were
incurred during the month of September. This was due to the fact that
a great part of the work effort involved evaluation of nickel-cobalt-
manganese alloys which are technically not a part of this contract. Since
we are considering such alloys as a back-up material for the nickel-
manganese alloy, most of the testing costs were separately funded. We
make this point as fulfilling a previous promise that data on the nickel-
cobalt-manganese alloys would be freely available to MSFC.
- 3 -
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Study of high performance alloy electroforming

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