Creep And Oxidation Resistant Engine Alloy Ti-6Al-2Sn-4Zr-2Mo
Titanium 6-2-4-2 (Ti-6Al-2Sn-4Zr-2Mo) is an alpha-beta titanium alloy that is capable of being heat-treated to higher strengths in larger section sizes than 6Al-4V Grade 5. Typically found in forged components, Ti-6Al-2Sn-4Zr-2Mo forged material demonstrates greater strength, ductility, and a good combination of low-cycle fatigue and fatigue-crack growth resistance.
Ti-6Al-2Sn-4Zr-2Mo was developed to handle operations in high temperature applications of up to 538°C (°1000.4°F). Used in the intermediate compressor stages of turbine engines for disks, blades, seals and other airframe parts. This alloy has a combination of excellent strength and corrosion resistance with comparatively good weldability and fabricability.
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Chemical Composition
| Element | Content (%) |
|---|---|
| Titanium, Ti | 83.785 - 87.24 |
| Aluminum, Al | 5.5 - 6.5 |
| Zirconium, Zr | 3.6 - 4.4 |
| Tin, Sn | 1.8 - 2.2 |
| Molybdenum, Mo | 1.8 - 2.2 |
| Iron, Fe | ≤ 0.25 |
| Oxygen, O | ≤ 0.15 |
| Silicon, Si | 0.060 - 0.10 |
| Carbon, C | ≤ 0.050 |
| Nitrogen, N | ≤ 0.050 |
| Hydrogen, H | ≤ 0.015 |
| Other, each | ≤ 0.10 |
| Other, total | ≤ 0.30 |
Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 4.54 g/cm3 | 0.164 lb/in3 |
| Melting point | ≤ 1705°C | ≤ 3101°F |
Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 1110 MPa | 161000 psi |
| Yield strength | 1050 MPa | 152000 psi |
| Poisson's ratio | 0.325 | 0.325 |
| Elastic modulus | 118 GPa | 17100 ksi |
| Shear modulus | 44.5 GPa | 6450 ksi |
| Elongation at break | 13% | 13% |
| Hardness, Brinell | 318 | 318 |
| Hardness, Knoop | 346 | 346 |
| Hardness, Rockwell C | 34 | 34 |
| Hardness, Vickers | 333 | 333 |
Thermal Properties
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion coefficient (@0.000-100°C/32-212°F) | 7.70 µm/m°C | 4.28 µin/in°F |
| Thermal conductivity | 7 W/mK | 48.6 BTU in/hr.ft².°F |
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Machinability
Although tough, grade Ti-6Al-2Sn-4Zr-2Mo titanium alloy can be machined using the right quantity of coolant flow, slow speeds and high feed rates. High-speed tools should be used for tooling this alloy and the recommended tool types are tungsten carbide designations C1-C4 or cobalt based.
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Forming
Grade 6Al 2Sn 4Zr 2Mo titanium alloy can be hot or cold formed.
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Welding
Weldabilty of grade 6 Ti-5Al-2.5Sn alloy is rated as fair.
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Heat Treatment
Recommended heat treatment is Beta minus 14C (25 F).
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Annealing
Duplex annealing of this material can be performed by holding at 900°C (1670° F) for 1/2 h, air cooling to 788°C (1465°F) and again air cooled. In case of beta annealing, the process requires holding at 1024°C (1900°F) for 1/2 h, air cooling to 593°C (1100°F) for 8 h and finally air cooled.
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Forging
Rough forging can be performed at 1038-1066°C (1929-1980°F) and completed at 954-982°C (1770-1825°F).
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Hot Working
Hot working enhances the overall ductility of the material.
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Cold Working
Cold working features of this material is same as that of austenitic stainless steel. Post-work annealing is recommended to re-attain favorable performance properties.
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Aging
Aging of grade 6Al 2Sn 4Zr 2Mo titanium alloy can be performed by holding the material at 538-593 °C (1000-1100 °F) for 8 h and then air cooling.
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Applications
Grade 6Al 2Sn 4Zr 2Mo titanium alloy is used in the following application areas:
- Sheet metal parts in afterburners and hot airframe sections
- Gas turbine compressor components e.g. discs, blades, and impellers.
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