ANP P R O J E C T PROGRESS R E P O R T
Fig. 6.2. Stress-Rupture C u r v e s for 0.060-in.-Thick at 210OOF and T e s t e d in Argon at 1650OF.
Sheet Specimens
of H a s t e l l o y
B Solution-Annealed
TABLE 6.8. CREEP-RUPTURE TESTS OF MODIFIED NICKEL-MOLYBDENUM ALLOYS AI loy Composition (wt
Stress
X)
77 Ni-20 Mo-3 Cr
Time
to
Rupture
Elongation
(Psi)
(hr)
(%I
8000 5000
90
7
67 5
9
8000
80
7
8000
444
28
8000
380
%
7 5 Ni-20 Mo-5 Cr 74.75 Ni-20 Mo-5 Cr-0.25 73 Ni-20 Mo-7 Cr
Ce
between physical properties and the corresponding microstructures. As a r e s u l t of this investigation, more comprehensive information on the high-temture properties of t h i s material is being obe r i t s of various preaging telloy B are also being that, as a r e s u l t of t h i s be developed which will
s t a b i l i z e t h e microstructure sufficiently to t h e s e n s i t i v i t y to high-temperature aging. A summary of the short-time t e n s i l e d a t a t h a t h a v e been obtained to d a t e is presented in Figs. 6.5, 6.6, and 6.7, and in Table 6.9. It may be noted in Fig. 6.5, which s h o w s t h e r e s u l t s of t h e t e s t in which the variable of a g i n g t i m e w a s investigated, t h a t t h e tensile-strength a n d yield-point