Description
Corrosion Resistance
Alloy 901 has good corrosion resistance to the atmospheres normally found in jet engine operations. It has slightly lower scaling resistance than such alloy as Types 309 and 310 stainless steel.
Heat Treatment
Solution Treatment
1975/2025°F (1080/1107°C), hold 2 hours at heat, and water quench.
Stabiliztion Treatment
1400/1475°F (760/802°C), hold 2 to 4 hrs, and air cool.
Precipitation Hardening Treatment
1300/1375°F (704/746°C), hold for 24 hours, and air cool.
Workability
Hot Working
Alloy 901 is forged between 2050°F (1121°C) and 1850°F (1010°C), metal temperature. Light hot work may be continued down to 1600°F (871°C) but not below. Metal temperature should not exceed 2050°F (1121°C) during rapid working. Billets should be charged into a hot furnace and heated rapidly through the precipitation hardening range.
Weldability
Alloy 901 can be welded by the inert-gas-arc method. It is difficult to weld. All welding should be done in the solution treated condition. Cold worked parts should be re-solution treated before welding. A re-solution treatment is recommended after welding before stabilizing and aging.
Typical Mechanical Properties
Tensile Properties
Solution Treated: 2000°F (1093°C), 2 hours, water quenched. Stabilized: 1425°F (774°C), 4 hours , air cooled. Aged: 1350°F (732°C), 24 hours, air cooled.
| Test Temperature |
0.2% Offset Yield Strength |
Ultimate Tensile Strength |
% Elongation in 2″ |
% Reduction of Area |
|||
| °F | °C | ksi | MPa | ksi | MPa | ||
| 70 800 1000 1200 1300 1400 1500 |
21.1 427 538 649 704 760 816 |
125.0 116.5 113 117 114 102.5 79 |
862 803 779 807 786 707 545 |
175 159 156 150 130 107.5 81 |
1207 1096 1076 1034 896 741 559 |
15.0 16.0 17.0 14.0 11.5 9.0 13.0 |
19.0 25.5 29.0 21.0 15.5 14.5 20.0 |
Stress Rupture Strength
Solution Treated: 2000°F (1093°C), 2 hours, water quenched. Stabilized: 1425°F (774°C), 4 hours , air cooled. Aged: 1350°F (732°C), 24 hours, air cooled.
| Test Temperature |
Stress to Produce Rupture in | ||||||
| °F | °C | 10 Hours | 100 Hours | 1000 Hours | |||
| ksi | MPa | ksi | MPa | ksi | MPa | ||
| 1000 1200 1350 1500 |
538 649 732 816 |
— 96.5 60 35 |
— 665 414 241 |
120 90 51 22.5 |
827 621 352 155 |
100 75 33 11 |
689 517 228 76 |
Physical Properties
Density, lb/cu in……………………………………………………………….. 0.294 Mg/cu m……………………………………………………………….. 8.14 Melting Range, °F……………………………………………………… 2335-2455 °C……………………………………………………… 1280-1345 Specific heat, Btu/lb-°F………………………………………………………. 0.103 J/kg-°C…………………………………………………………… 431 Permeability at 200 oersted (15.9 kA/m)………………………………..1.013 Coeffiecent of Expansion, 68-212°F, 10(-6) in/in-°F………………. 7.50 20-100°C, æm/m-°C……………………. 13.50 Electrical Resistivity, ohm-cir mil/ft……………………………………….. 674 æê-m………………………………………………….. 1.12
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