Grade Ti-13V-11Cr-3Al Alloy

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

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