TIMETAL ® 17

Product catalog summary

Overview:
TIMETAL® 17 is a high-strength, deep hardenable forging alloy primarily used in jet engines. It is a near-alpha alloy that can be heat-treated to various strength levels in sections up to 6 inches. The alloy offers good ductility, toughness, low-cycle and high-cycle fatigue properties, and high creep resistance at intermediate temperatures.

Chemical Composition:
The alloy consists of Aluminum (4.5-5.5%), Tin (1.6-2.4%), Zirconium (1.6-2.4%), Molybdenum (3.5-4.5%), Chromium (3.5-4.5%), with minor amounts of Carbon, Nitrogen, Oxygen, Hydrogen, and residuals.

Physical Properties:
Density is 0.168 lb/in³ (4.65 g/cm³). The Beta Transus temperature is 1635°F (890.5°C). The tensile modulus ranges from 16-16.5 Msi (110-113 GPa).

Heat Treatment:
Solution Treat & Age (STA) involves heating at 1475°F for 4 hours followed by water quenching, then aging at 1175°F for 8 hours with air cooling. Stress relief before finish machining is done at 1020°F for 4 hours with air cooling.

Mechanical Properties:

Low Cycle Fatigue: At 75°F, the total cycles to failure range from 3,180 to 60,600 depending on strain levels. At 600°F, cycles range from 3,600 to over 86,000.
High Cycle Fatigue: At 75°F, cycles to failure range from 21,000 to 7,000,000 depending on stress levels. At 600°F, cycles range from 37,000 to over 15,000,000.
Tensile Properties: At 77°F, the ultimate tensile strength (UTS) ranges from 160-180 ksi with 8-15% elongation.
Fracture Toughness: Yield strength is 168 ksi with KIC values ranging from 26-31 ksi√in.
Stress Rupture: At 400°F, stress levels range from 137 to 145 ksi with time to rupture from 0.01 to over 1,000 hours.
Creep Properties: At 400°F, stress levels range from 115 to 120 ksi with time to 0.2% strain from 0.01 to 2,200 hours.

Recommendations:
Consult TIMET technical personnel for specific applications and operating conditions. Contact information for North America and Europe is provided for further assistance.

Catalog excerpts

TIMETAL® 17 is a high strength deep hardenable forging alloy primarily used for jet engines. Metallurgical^ it is a near-p alloy capable of being heat treated to a variety of strength levels in sections up to 6 inches. This is the major advantage of TIMETAL® 17 offering good ductility and toughness, as well as good low-cycle and high cycle fatigue properties and high creep resistance at intermediate temperatures. CHEMICAL COMPOSITION (PHYSICAL PROPERTIES HEAT TREATMENT STA (Solution Treat & Age) Stress Relieve (before finish machining) 1475°F for 4 hr, water quench, 1175°F for 8 hr, air cool 1020°F for 4 hr, air cool TYPICAL LOW CYCLE FATIGUE, STA CONDITION As (Strain Control, A* = 1.0) Temperature, °F (°C) Plastic Elastic Load Control, A* = 1.0 Stress Range, ksi 160 155 145 135 130 120 130 125 122 121 _120_ Alternating Stress -r- mean stress

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TYPICAL HIGH CYCLE FATIGUE, STA CONDITION (LOAD CONTROL, A* = 0.95) Temperature, °F (°C) Maximum Stress, ksi (MPa) Alternating Stress, ksi (MPa) Cycles to Failure A* = Alternating Stress + mean stress TYPICAL TENSILE AND NOTCHED TENSILE PROPERTIES, STA CONDITION Notched tensile strength _(ksi)_ At 75°F= 200-220 210-220 200-210 185-195 185-195 Notched tensile strength + ultimate tensile strength FRACTURE TOUGHNESS TYPICAL STRESS RUPTURE PROPERTIES (STA) Yield Strength, ksi (MPa) KIC, ksiVin (MPaVm) 168(1158) 26-31 (28.6-34.1) TYPICAL CREEP PROPERTIES, STA Temperature, °F(°C) Stress, ksi (MPa)...

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TIMETAL ® 17

TIMETAL ® 17

Catalog excerpts

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