Jul 5 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Welding
Annealing
Applications
Introduction
Titanium alloys have several advantageous attributes that allow their use in industries like automobile, consumer electronics, military, aerospace, medical, marine, and sports equipment.
Grade 7 Ti-0.15Pd alloy is highly resistant to corrosion in reducing acids and localized attack in hot halide media. The presence of palladium helps to enhance the alloy’s corrosion resistance. This alloy is similar to grade 2, and possesses medium strength and ductility.
The following sections will discuss in detail about grade 7 Ti-0.15Pd alloy.
Chemical Composition
The chemical composition of grade 7 Ti-0.15Pd alloy is outlined in the following table.
|
Element |
Content (%) |
|
Iron, Fe |
0.3 |
|
Oxygen, O |
0.25 |
|
Palladium, Pd |
0.12-0.25 |
|
Carbon, C |
0.08 |
|
Nitrogen, N |
0.03 |
|
Hydrogen, H |
0.015 |
|
Other, total |
0.4 |
|
Titanium, Ti |
Balance |
Physical Properties
The physical properties of grade 7 Ti-0.15Pd alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
4.51 g/cm3 |
0.162 lb/in3 |
Mechanical Properties
The following table shows mechanical properties of grade 17 Ti-0.05Pd alloy.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
485 MPa |
70343 psi |
|
Yield strength |
350 MPa |
50763 psi |
|
Elastic modulus |
103 GPa |
14938 ksi |
|
Elongation in 50 mm (A5) |
28% |
28% |
|
Hardness (HV) |
150 |
150 |
Thermal Properties
The thermal properties of grade 7 Ti-0.15Pd alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Thermal conductivity (room temperature) |
20.8 W/mK |
144 BTU in/hr.ft².°F |
Fabrication and Heat Treatment
Welding
Weldability of grade 7 Ti-0.15Pd alloy is rated as excellent. This alloy is a single-phase material, hence the microstructure of the alpha phase is not affected by thermal treatments or welding temperatures.
Annealing
Annealing of this material can be performed by heating to 650-760°C (1202-1400°F) for 6 min -2 h and then air cooled. In case stress relieving is required, the material has to be heated to 480-595°C (896-1103°F) for 15 min - 4 h, and then air cooled.
Applications
Grade 7 Ti-0.15Pd alloy is used in the following application areas:
-
Anode/cathode/cell components
-
Chemical processing equipment
-
Air pollution control equipment
-
Pulp/paper bleaching/washing equipment
-
Hydrometallurgical extraction/electrowinning
-
Desalination, brine concentration/evaporation