TIMETAL ® 17
1 / 2Páginas

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

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...