Alloy VM-103 is especially promising for use in applications requiring short time exposure to very high temperatures. Its properties over broad range of temperatures are superior to those of comparable commercial wrought cobalt-base superalloys, L-605 and HS-188

Freche, J. C.

Harf, F. H.

Harlow, R. A.

English

NASA Technical Reports Server

August 1974	 B74-10081 
•	 NASA TECH BRIEF 
Lewis Research Center 
NASA Tech Briefs announce now technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service. Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Cobalt Base Superalloy Has Outstanding 
Properties Up to 1478 K (2200°F) 
S
NASA alloy VM . 103 (cobalt .25W-3Cr- lTi.0.5Zr-0.SC) 
can be produced in wrought form and has outstanding 
properties up to 1478 K (2200 0 F). Working schedules and 
specifications have been developed. This alloy is especially 
promising for use in applications requiring short time 
exposure to very high temperatures. Its properties over a 
broad range of temperatures are superior to those of 
comparable commercial wrought cobalt-base superalloys, 
L-605 and HS-188. 
Alloy VM-103 was originally developed as a high 
strength cobalt-base cast superalloy (U.S. Patent No. 
3,276,865). It has been demonstrated that its ductility 
allows it to be processed by hot and cold rolling. Ingots 
have been produced by induction plus vacuum arc 
remelting and by induction plus electrbslag remelting. The 
ingots have been forged and hot rolled, typically at 1463 
K (2174°17). Adding up to 10 percent nickel to the base 
composition is beneficial and further enhances alloy 
workability without adversely affecting other mechanical 
properties. The alloy can be rolled with reductions up to 
25 percent per pass with intermediate anneals at 1478 K 
(2200°F). 
Cold rolled sheet alloy in the solution heat-treated 
(1478 K (22000 F), one-half hour, water quench) condi-
tion has average tensile properties as follows: 
ULTIMATE 
TEMPERATURE TENSILE STRENGTH YIELD STRENGTH EL0I4GATICN 
K OF
PSI 
PiN/N2	 Cx 1000) MN/N2
P51 
(x 1000) 2 
298 75 1095	 159 705 102 17 
923 1200 780	 113 540 78 12 
1143 1600 565	 82 400 58 3 
1238 1770 415	 60 295 43 2 
1568 2000 150	 22 
At high strain rates (5 per minute), the tensile properties 
are higher:
ULTIMATE 
TEMPERATURE	 TENSILE STRENGTH	 YIELD STRENGTH	 ELONGATION
Comparatively, for L-605, the corresponding values are: 
Notes: 
I. Potential applications for high temperature cobalt-base 
superalloy include high firing rate small caliber gun 
barrels and gun barrel liners, gas valve and hydraulic 
power system components for missiles, various static 
parts on jet engines, ramjets and rocket engines, where 
high temperature strength is required up to 1478 K 
(2200°F). 
2. Further information is available in the following 
reports: 
NASA CR-121 189 (N73-21457), Further Develop-
ment and Characterization of VM-103, A NASA 
Wrought Cobalt-Base Alloy 
NASA CR-72726 (N70-37090), Development and 
Metallurgy Study of a NASA Cobalt-Base Super-
alloy 
Copies may be obtained at cost from: 
Aerospace Research Applications Center 
Indiana University 
400 East Seventh Street 
Bloomington, Indiana 47401 
Telephone: 812-337.7833 
Reference: B74-10081 
3. Specific technical questions may be directed to: 
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B74-10081
K OF MN/s2 (x 1000)
PSI
MN/s2
I 
Cx
P
 1
S
000)	 2 
298 75 1140 165 850 123	 22 
S
923 
1143 
1253
1200 
1600 
1800
820 
725 
470
119 
105 
68
515 
485 
395
75	 26 
70	 12 
1368 2000 275 40 270
57	 19 
39	 19 
1.478 2200 180 26 180 26	 20
ULTIMATE 
TEMPERATURE TENSILE STRENGTH YIELD STRENGTH ELONGATICU 
K	 OF
PSI 
MN/s2	 (x 1000)
PSI 
MIs2	 Cx 1000) 2 
1368	 2000 217	 31.5 192	 27.8 25 
1478	 2200 123	 17.8 123	 17.8 25
(continued overleaf) 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and S pace Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights. 
https://ntrs.nasa.gov/search.jsp?R=19740000081 2020-03-17T14:02:14+00:00Z
Patent Status: 
NASA has decided not to apply for a patent. 
Source: R.A. Harlow
Philco-Ford Co.
under contract to
Lewis Research Center, and
F.H. L-larf and J.C. Freche
Lewis Research Center
(LEW.
 12089)
. 
C 
B74.10081	 Category 03


Cobalt base superalloy has outstanding properties up to 1478 K (2200 F)

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