HAYNES® 230® alloy exhibits excellent retained ductility after long-term thermal exposure at intermediate temperatures. It does not exhibit sigma phase, mu phase, or other deleterious phase formation even after 16,000 hours of exposure at temperatures from 1200 to 1600°F (649 to 871°C). Principal phases precipitated from solid solution are all carbides.
This contrasts markedly with many other solid-solution-strengthened superalloys such as HAYNES® 188 alloy, HAYNES® 625 alloy, and HASTELLOY® X alloy. These alloys all precipitate deleterious phases, which impair both tensile ductility and impact strength.
Room-Temperature Properties after Thermal Exposure
Condition |
0.2% Yield
Strength |
Ultimate Tensile
Strength |
Elongation |
R.A. |
Impact Strength |
| ksi |
ksi |
% |
% |
ft-lb |
| MA |
58.4 |
123.1 |
50 |
47.2 |
54 |
| + 1200/8,000 hr |
57.9 |
128.0 |
36.4 |
39 |
31.4 |
| + 1200/20,000 hr |
57.6 |
128.4 |
34.8 |
37 |
28.9 |
| + 1200/30,000 hr |
59.4 |
129.9 |
34 |
38.3 |
- |
| + 1200/50,000 hr |
61.2 |
131.7 |
33.9 |
36.9 |
25.8 |
|
| +1400/8,000 hr |
59.2 |
129.7 |
32 |
34.3 |
18.7 |
| +1400/20,000 hr |
55 |
126.9 |
31.2 |
31.6 |
18.8 |
| +1400/30,000 hr |
54.3 |
126.9 |
31.3 |
33.9 |
- |
| +1400/50,000 hr |
55.2 |
127.7 |
32.2 |
32.5 |
20.7 |
|
| + 1600/8,000 hr |
54.3 |
122.7 |
36.2 |
34.6 |
21.6 |
| + 1600/20,000 hr |
50.1 |
121.6 |
34.4 |
31.1 |
19.5 |
| + 1600/30,000 hr |
49.6 |
120.0 |
32.1 |
28.6 |
- |
| + 1600/50,000 hr |
50.4 |
116.7 |
25.2* |
20.2 |
14.8 |
*BIGM; AGL Elong, which tends to be lower; Other data are 4D Elong.
R.A.= Reduction of Area