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

TB5 alloy is a metastable β-type titanium alloy with a nominal composition of Ti-15V-3Cr-3Sn-3Al, containing isomorphous β-stabilizing element V, eutectoid β-stabilizing element Cr, neutral elements Sn and α-stabilizing Element Al. The alloy has excellent cold rolling and cold forming properties. The cold rolling deformation can reach more than 90%. It can form moderately complex sheet metal parts at room temperature. It can also be superplasticized at 700°C and can be cold-headed rivets. And bolts. The alloy can also reach a strength of more than 1240MPa through aging treatment, and has excellent welding performance and corrosion resistance. Ti-15V-3Cr-3Sn-3Al alloy is mainly used to manufacture various sheet metal components, as well as fasteners. It can meet the requirements of high structural efficiency, high production efficiency and low manufacturing cost. The working temperature in the solution treatment state is below 200 ℃, and the solution aging is The working temperature of the state can reach 290℃. The semi-finished products of this alloy mainly include thin plates, strips and rods (wires), as well as pipes and castings.

Physical and chemical properties of TB5
Density /g.cm^-3	Linear expansion coefficient /10^-6K^-1	Specific heat capacity /10^-6K^-1
4.77	8.81(20~100℃)	551(100℃)

Ti-15V-3Cr-3Sn-3Al Titanium Alloy chemical composition (mass fraction) %

Grade

Alloy Element

Impurities≤

V

Cr

Sn

Al

Ti

Fe

C

N

H

O

Other Element

Single

Total

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

14.0~16.0

2.5~3.5

2.8~3.6

margin

0.25

0.05

0.015

0.13

0.1

0.4

Forms of Ti-15V-3Cr-3Sn-3Al Titanium Alloy We Can Provide

Physical and Chemical Properties of Ti-15V-3Cr-3Sn-3Al

1. Density ρ=4.77g/cm³

2. Thermal conductivity

Thermal conductivity
θ/℃	20	100	200	300	400	500	600
λ/W·m^-1·K^-1	6.1	7.3	8.8	10.4	12	13.7	15.4

3. Specific heat capacity

Specific heat capacity
θ/℃	20	100	200	300	400	500	600
c/J·kg^-1·K^-1	536	551	567	583	599	616	630

4. Coefficient of linear expansion

Coefficient of linear expansion
θ/℃	20～100	20～200	20～300	20～400	20～500	20～600
α/10^-6·K^-1	8.81	9.26	9.45	9.73	9.95	10.25

5. Blackness factor

Blackness factor
θ/℃	150	200	250	300
εn	0.21	0.24	0.27	0.29

6. Resistivity

Resistivity
θ/℃	20	100	200	300	400	500	600
ρ/μΩ·m	1.45	1.48	1.51	1.54	1.57	1.59	1.6

7. Magnetic properties Non-magnetic
8. Antioxidant properties
Since Ti-15V-3Cr-3Sn-3Al contains 15% V, its oxidation resistance is worse than that of Ti-6Al-4V (Ti Gr5).
9. Corrosion resistance
Like most titanium alloys, Ti-15V-3Cr-3Sn-3Al has excellent resistance to general corrosion when exposed to common environmental conditions. Ti-15V-3Cr-3Sn-3Al does not require special surface treatment when used in aircraft structures. However, due to the reason of hydrogenation, when Ti-15V-3Cr-3Sn-3Al works under the environmental conditions that may generate a large amount of hydrogen, surface modification treatment must be carried out to prevent hydrogenation. The contact corrosion behavior of Ti-15V-3Cr-3Sn-3Al with structural steel and aluminum alloy is the same as that of Ti-6Al-4V (Ti Gr5).

Phase Transformation and Microstructure of Ti-15V-3Cr-3Sn-3Al

Phase transition temperature

The transformation temperature of α+β↔β phase is 750~770℃

Microstructure

After solution treatment in the β phase region, the alloy is a single β phase after air cooling or water quenching, and the microstructure after slow cooling is a small amount of α phase distributed on the β phase matrix. The structure of solid solution aging treatment (480~675°C) is composed of β phase and α phase.

Manufacturing process and performance of Ti-15V-3Cr-3Sn-3Al

Heat treatment system

Solution treatment

Select the solution treatment temperature in the range of 760~815℃ or 790~815℃. The usual solution treatment system is 800℃±15℃, 3~30min, air cooling or faster cooling.

Prescription

The aging temperature is 480~675℃, and the aging time is 2~24h. According to the strength level, three aging systems are usually adopted, and the temperature fluctuation range is ±6℃.
Intensity class Prescription system
σ_b≥1000MPa, δ₅₀≥7% 540℃, 8h, air cooling
σ_b≥1080MPa, δ₅₀≥6% 520℃, 10h, air cooling
σ_b≥1240MPa, δ₅₀≥5% 480℃, 16h, air cooling

Stress relief annealing

680~710℃, 30~60min, cooling in air or inert gas or cooling with furnace.

Application of Ti-15V-3Cr-3Sn-3Al Titanium Alloy

Ti-15V-3Cr-3Sn-3Al Titanium Alloy is mainly used to manufacture high-strength sheet metal parts in aircraft structures and rivets for cold riveting. It has been used to manufacture aircraft drag parachute beams (1080MPa strength level) and supporting rivets. In the satellite structure, it has been used to manufacture apogee engine supports and support cones. In civilian use, it is used to make the striking surface of golf heads.