TIMET TIMETAL® 834 (Ti-5.8Al-4Sn-3.5Zr-0.7Nb-0.5Mo-0.35Si-0.06C) Titanium Alloy

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TIMET TIMETAL® 834 (Ti-5.8Al-4Sn-3.5Zr-0.7Nb-0.5Mo-0.35Si-0.06C) Titanium Alloy
Categories:	Metal; Nonferrous Metal; Titanium Alloy; Alpha/Near Alpha Titanium Alloy
Material Notes:	High-Strength, High Temperature, Creep Resistant Alloy Industry Specifications: France: T-A6EZ r4Nb. Features: TIMETAL 834 is a near alpha titanium alloy offering increased tensile strength and creep resistance up to 600°C together with improved fatigue strength when compared with established creep resistant alloys such as TIMETAL 6-2-4-2, TIMETAL 829 and TIMETAL 685. Like these alloys, it is weldable and has good forgeability. Major uses for TIMETAL 834 include rings, compressor discs and blades for aeroengines. It is nonmagnetic. Typical heat treatment for this alloy: Solution heat treatment: 1015°C for 2 hours, oil quench. Aging heat treatment: 700°C for 2 hours, air cool. Data provided by TIMET.
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Physical Properties	Original Value	Comments

Density	4.55 g/cc	Typical

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	1050 MPa	Typical
Tensile Strength, Yield	930 MPa @Strain 0.2 %	Typical
Elongation at Break	11 %	Typical
Reduction of Area	>= 15 %
Modulus of Elasticity	120 GPa	Typical
Notched Tensile Strength	>= 1493 MPa	Kt=3
Fatigue Strength	<= 350 MPa @# of Cycles 1.00e+7	Notched; Kt = 2; stress range 0 to 350 Mpa
	560 MPa @# of Cycles 1.00e+7	unnotched, stress range 0 to 560 Mpa
Fracture Toughness	>= 45.0 MPa-m½	K(IC)
Bend Radius, Minimum	6.0 t @Thickness 2.00 mm	Typical; sheet

Thermal Properties	Original Value	Comments
CTE, linear	10.6 µm/m-°C @Temperature 20.0 - 200 °C
	10.9 µm/m-°C @Temperature 20.0 - 400 °C
	10.9 µm/m-°C @Temperature 20.0 - 600 °C
Thermal Conductivity	7.06 W/m-K
Maximum Service Temperature, Air	600 °C	Good tensile and creep to 600°C
Beta Transus	1045 °C

Component Elements Properties	Original Value	Comments
Aluminum, Al	5.5 - 6.1 %
Carbon, C	0.040 - 0.080 %
Hydrogen, H	<= 0.0060 %
Iron, Fe	<= 0.050 %
Molybdenum, Mo	0.25 - 0.75 %
Niobium, Nb (Columbium, Cb)	0.50 - 1.0 %
Nitrogen, N	<= 0.030 %
Oxygen, O	0.075 - 0.15 %
Silicon, Si	0.20 - 0.60 %
Tin, Sn	3.0 - 5.0 %
Titanium, Ti	81 - 87.4 %	Calculated as remainder
Zirconium, Zr	3.0 - 5.0 %

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NTIME834 / 19341

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