Titanium Alloys - Timetal 1100 Physical and Mechanical Properties and Fabrication

 

Background

This near-alpha alloy was developed primarily for elevated temperature applications in the range of 600°C (1112°F) or possibly slightly higher. In the beta-processed condition, Ti-1100 offers the highest combination of strength, creep resistance, fracture toughness and stability. It has approximately 38°C (100°F) advantage in terms of creep and stress rupture over beta-processed Ti-6242Si. After long exposure in the 500-650°C (932-1200°F) range, Ti-1100 demonstrates good bulk stability. Coatings may be required for prolonged use above 600°C (1112°F).

Two conditions are recommended:

        Beta forged, which gives a balance of creep resistance, ductility and stability

        Beta annealed which has slightly better creep resistance than the beta forged,  but somewhat lower ductility and tability.

Composition

Table 1. The composition of Timetal 1100.

 

Content

Al

5.5-6.5%

Sn

2.4-3.0%

Zr

3.5-4.5%

Fe

<0.30

Mo

0.35-0.50%

Si

0.35-0.50%

C

<0.04%

O2

<0.09%

N2

<0.03%

Others

<0.30%

Ti

Balance

 

Key Properties

Physical Properties

Table 2. Typical physical properties for Timetal 1100.

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.55 (0.164)

Volume Electrical Resistivity ohm.cm (ohm.in)

180 (71)

Thermal Conductivity W/m.K (Btu/ft.hr.°F)

6.6 (3.9)

Mean Thermal Expansion Co-eff 0-100°C /°C (32-212°F /°F)

8.8x10-6 (4.9)

Mean Thermal Expansion Co-eff 0-300°C /°C (32-572°F /°F)

9.5x10-6 (5.4)

Mean Thermal Expansion Co-eff 0-550°C /°C (32-1022°F /°F)

10.1x10-6 (5.6)

Mean Thermal Expansion Co-eff 0-650°C /°C (32-1200°F /°F)

10.1x10-6 (5.6)

Beta Transus °C±15°C (°F)

1020 (1868)

Mechanical Properties

Table 3. Typical mechanical properties for Timetal 1100.

Property

Typical

0.2% Proof Stress MPa (ksi)

910 (132)

Tensile Strength MPa (ksi)

1000 (145)

Elongation over 2 inches %

8

Reduction in Area %

15

Fracture Toughness MPa.m½ (ksi.in½) annealed + 600°C (1112°F) 8hrs

64 (58)

Notched Fatigue Strength MPa (ksi) Kt1

655 (95)

Notched Fatigue Strength MPa (ksi) Kt3

250 (36)

Notched Fatigue Strength MPa (ksi) Kt1, 480°C (896°F)

500 (72)

Notched Fatigue Strength MPa (ksi) Kt3, 480°C (896°F)

235 (34)

Long Term Creep for 0.2% strain hr, 565°C (1049°F) 275MPa (40ksi)

2250

Long Term Creep for 0.2% strain hr, 510°C (950°F) 414MPa (60ksi)

430

Long Term Creep for 0.2% strain hr, 595°C (1100°F) 1654MPa (240ksi)

1025

Table 4. Mechanical properties for Timetal 1100 cast, hipped and annealed (625°C (1100°F), 8 hours).

Property

Typical

0.2% Proof Stress MPa (ksi)

848 (123)

0.2% Proof Stress MPa (ksi) at 500°C (932°F)

579 (84)

Tensile Strength MPa (ksi)

917 (133)

Tensile Strength MPa (ksi) at 500°C (932°F)

690 (100)

Elongation over 2 inches %

6

Elongation over 2 inches % at 500°C (932°F)

7

Fabrication

        Weldability – Good

        Forging – Beta forge: 1065 - 1095°C (1950-2000°F), plus stabilise 8hrs at 595-705°C (1100-1300°F)

        Annealing – Beta anneal: 1065-1095°C (1950-2000°F), plus stabilise 8hrs at 595-705°C (1100-1300°F)

        Ageing - 593°C (1100°F), over 8hr

 

Source: The Titanium Information Group

 

For more information on this source please visit The Titanium Information Group

 

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