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HAYNES® Alloys

Thermal Stability

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.

230 - Thermal Stability

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

Retained Room Temperature Tensile Ductility after 8000 Hour Exposure at Temperature


Exposure Temperature
230® 188 625 X
Room Temperature Tensile Elongation Room Temperature Tensile Elongation Room Temperature Tensile Elongation Room Temperature Tensile Elongation
°F % % % %
1200 36.4 29.1 18 19
1400 32 10.8 13 19
1600 36.2 22.2 26 30
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