Aug 9 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Forming
Welding
Annealing
Forging
Hot Working
Cold Working
Applications
Introduction
Titanium alloys are light weight metals with excellent corrosion resistance, very high tensile strength and high toughness.
Grade Ti-13V-11Cr-3Al alloy is a heat treatable beta alloy titanium. This alloy is known to possess good fabricability and excellent corrosion resistance and mechanical properties. It is basically used in high strength applications.
The following sections will discuss in detail about grade Ti-13V-11Cr-3Al alloy.
Chemical Composition
The chemical composition of grade Ti-13V-11Cr-3Al alloy is outlined in the following table.
|
Element |
Content (%) |
|
Vanadium, V |
12.5 - 14.5 |
|
Chromium, Cr |
10-12 |
|
Aluminum, Al |
2.5 - 3.5 |
|
Iron, Fe |
0.35 max |
|
Oxygen, O |
0.17 max |
|
Carbon, C |
0.05 max |
|
Nitrogen, N |
0.05 max |
|
Hydrogen, H |
0.025 max |
|
Titanium, Ti |
Remainder |
Physical Properties
The physical properties of grade Ti-13V-11Cr-3Al alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
4.84 g/cm3 |
0.175 lb/in3 |
Mechanical Properties
The following table shows mechanical properties of grade Ti-13V-11Cr-3Al alloy.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
1276 MPa |
185068 psi |
|
Yield strength |
1207 MPa |
175060 psi |
|
Poisson's ratio |
0.304 |
0.304 |
|
Elastic modulus |
101.4 GPa |
14706 ksi |
|
Elongation at break |
8% |
8% |
|
Hardness (HRC) |
40 |
40 |
Thermal Properties
The thermal properties of grade Ti-13V-11Cr-3Al alloy are tabulated below.
|
Properties |
Conditions |
|
T (°C) |
Treatment |
|
Thermal expansion |
9.4 x 10-6/°C |
20-100 |
- |
Other Designations
Equivalent materials to grade Ti-13V-11Cr-3Al alloy are as follows:
-
AMS 4917
-
AMS 4959
-
MIL F-83142
-
MIL T-9046
-
MIL T-9047
Fabrication and Heat Treatment
Machinability
Grade Ti-13V-11Cr-3Al 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.
Forming
Grade Ti-13V-11Cr-3Al alloy can be hot or cold formed.
Welding
Welding of grade Ti-13V-11Cr-3Al alloy is rated as good.
Annealing
Full annealing of this material can be performed by heating to 788°C (1450°F) for 15 min and then air cooled.
Forging
Forging can be performed at 1065-1176°C (1950-2150°F).
Hot Working
Hot working enhances the overall ductility of the material.
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.
Applications
Grade Ti-13V-11Cr-3Al alloy is used in the following application areas:
-
High-strength airframe components such as wire springs