Jul 24 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Forming
Welding
Annealing
Forging
Applications
Introduction
Grade 11 Ti-0.15Pd alloy’s mechanical properties are known to be similar to commercially pure titanium grade 1. The main difference is the presence of palladium in grade 11. Palladium helps to enhance the alloy’s corrosion resistance in crevices and reducing acid chloride environments. This alloy has excellent ductility, high-impact toughness and useful strength.
The following sections will discuss in detail about grade 11 Ti-0.15Pd alloy.
Chemical Composition
The chemical composition of grade 11 Ti-0.15Pd alloy is outlined in the following table.
|
Element |
Content (%) |
|
Iron, Fe |
<0.20 |
|
Oxygen, O |
<0.18 |
|
Palladium, Pd |
0.12-0.25 |
|
Carbon, C |
<0.10 |
|
Nitrogen, N |
<0.03 |
|
Hydrogen, H |
<0.015 |
|
Titanium, Ti |
Balance |
Physical Properties
The physical properties of grade 11 Ti-0.15Pd alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
4.51 g/cm3 |
0.162 lb/in3 |
|
Melting point |
1670°C |
3038°F |
Mechanical Properties
The following table shows mechanical properties of grade 11 Ti-0.15Pd alloy.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
345 MPa |
50038 psi |
|
Yield strength |
221 MPa |
32908 psi |
|
Elastic modulus |
103 GPa |
14938 ksi |
|
Elongation over 2”% |
37% |
37% |
|
Hardness (BHN) |
120 |
120 |
Thermal Properties
The thermal properties of grade 11 Ti-0.15Pd alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Thermal conductivity (room temperature) |
20.6 W/mK |
143 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to grade 11 Ti-0.15Pd alloy are as follows:
-
ASTM B265
-
ASTM B337
-
ASTM B338
-
ASTM B348
-
ASTM B861
-
ASTM B862
-
ASTM B381
-
ASTM B863
-
ASTM B363 (WPT)
Fabrication and Heat Treatment
Forming
Grade 11 Ti-0.15Pd alloy has good formability.
Welding
Weldability of grade 11 Ti-0.15Pd alloy is rated as excellent.
Annealing
Annealing of this material can be performed by heating to 704°C (1300°F) for 2 h and then air cooled. In case stress relieving is required, the material has to be heated to 482-538°C (900-1000°F) for 45 min.
Forging
Rough forging can be performed at 871°C (1600°F) and completed at 788-843°C (1450-1550°F).
Applications
Grade 11 Ti-0.15Pd alloy is chiefly used in the chemical and marine industries and in airframe construction sectors.