MECHANICAL PROPERTIES 
} 24 : 
XN 
20 aN 5 FATIGUE. In Table 6, the fa- 
2 NR . tigue tests were performed at 
3 ING 316° F on notched and un- 
> 1.6 ~#-Zr-2at mtemp, \ : notched specimens with their axes 
ra 3 large specimen > : parallel to the rolling directions. 
= 12 (0.187 "dia} Base-annealed specimens and 
= “| ~e-Zr-2 at rm temp, small beta-quenched-plus-annealed 
es specimen (0.140 dia) (700° C for 1 hr in vacuum, fur- 
2 08 ~@-7r-2 at 550°F, small nace cooled) specimens were 
Pe specimen(0.140' dia) tested. Results indicate a rela- 
tively high notch sensitivity (8). 
Cycles to failure for constant- 
“10? : io° : ¥ 10% : 10° strain fatigue tests (12) are 
pao Cycles to Failure ; shown at left. 
TABLE 8—Effect of Cold Work on 
Room-Temperature Properties 
(Longitudinal Specimens) (5) 
0.2% 2 
Cold yield Tensile 2 
reduction strength strength 2 = 
(%) (103 pst) (103 psi) DPH* S S 
= o 
S S 
0 66.2 82.6 210 = 2 ee 
10 81.1 92.2 228 ~S Bs a 
25 90.6 103.8 231 = N 
40 96.5 107.0 243 - 
60 97.1 111.2 256 x 
n 
@ 
* Diamond-pyramid hardness. = 
COLD WORKING, IRRADIATION. The ef- 
fects of cold working on room-temperature 
longitudinal tensile properties are given in 
Table 8 (8). Stress-strain curves along the 
longitudinal direction at 250° C for different 
amounts of cold work (14) are shown at 
right. Typical curves for control and 
irradiated (1.4 X 10?! nvt at 40°-60° C) 
specimens (15) are shown below. 
Cold-worked control 
100 oe 
80 — on me vere ? ~ ee ae 
a Be IE: en 
% 60 7 Annealed inode te ear 
3 eo Anneoled-irradiated = 
8 40 ee ee eee 
bs Annealed control ke aoe ae ape wee 
a 2 ee 
20 
O01 002. 004 008 
Natural Strain {in./in) : 
252 
