Ti-15V-3Cr-3Sn-3Al Alloy

1.    Introduction

Ti-15V-3Cr-3Sn-3Al (Ti-15-3-3-3) is one of the mostly widely used metastable Beta titanium alloys in aircraft industries. A wide range of strength levels can be achieved by heat-treating the Ti-15-3 alloy to meet various needs and applications. It has been reported that a tensile strength over 1700 MPa can be obtained through thermo-mechanical treatments of the Ti-15-3-3-3 alloy

Chinese Similar Materials: TB5      UNS R58153

Ti-15-3-3-3 Alloy Plate

2. Chemical Composition

3.Physical Properties

1)    Density: 4.77 g/cm3

2)    Nonmagnetic

3)    Thermal Conductivity: 20℃ -- 6.1     100℃ -- 7.3      200℃ -- 8.8 
                                       300℃ -- 10.4          400℃ -- 12.0    
                                       500℃ -- 13.7      600℃ -- 15.4

4)    Specific Heat Capacity: 20℃ -- 536     100℃ -- 551     
                                        200℃ -- 567    300℃ -- 583
                                        400℃ -- 599     500℃ -- 616       600℃ -- 630

5)    Electrical Resistivity:  20℃ -- 1.45     100℃ -- 1.48      200℃ -- 1.51 
                                     300℃ -- 1.54          400℃ -- 1.57    
                                     500℃ -- 1.59      600℃ -- 1.60

4.    Mechanical Property

5. Other Designations

Equivalent material to grade Ti 15V 3Cr 3Al 3Sn alloy is AMS 4914.

6. Fabrication and Heat Treatment

7. Machinability

Grade Ti 15V 3Cr 3Al 3Sn alloy is hard to machine but can be successfully done using slow speeds, high coolant flow, and high feed rates. Tooling should be performed using tungsten carbide designations C1-C4 or cobalt type high speed tools.

8. Forming

Grade Ti 15V 3Cr 3Al 3Sn alloy can be hot or cold formed. Cold forming is easy to perform. It is strip-producible.

Ti-15-3-3-3 Alloy Bars

9. Welding

Weldability of grade Ti 15V 3Cr 3Al 3Sn alloy is rated as good.

10. Annealing

Full annealing of this material can be performed by soaking at 792°C (1450°F) and then air cooled. The material can be stress relieved at 538-649°C (1000-1200°F).

11. Forging

Rough forging can be performed at 982-1093°C (1800-2000°F) and completed at 816-927°C (1500-1700°F).

12. Hot Working

Hot working enhances the overall ductility of the material.

UNS R58153 Bars

13. Cold Working

Cold working features of this material is same as that of a moderately tempered austenitic stainless steel. Post-work annealing is recommended to re-attain favorable performance properties.

14. Aging

Grade Ti 15V 3Cr 3Al 3Sn alloy can be aged at 538°C (1000°F) for 8 h and air cooled.

15. Applications

Grade Ti 15V 3Cr 3Al 3Sn alloy was primarily developed for airframe applications.

The other application areas include:

l  Aerospace fasteners

l  Tubing and tankage components

l  Flat-rolled products

l  Foil, plate, castings and forgings.

Ti-15-3-3-3 Hollow Bar