Grade Ti 15V 3Cr 3Al 3Sn Alloy (UNS R58153)

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
     Aging
Applications

Introduction

Titanium alloys are divided into alpha alloys, near-alpha alloys, alpha and beta alloys, and beta alloys. Grade Ti 15V 3Cr 3Al 3Sn alloy is a beta alloy that can be strip-rolled and heat-treated. It is highly formable, and has good room temperature bending properties. Solution treatment of this alloy enhances its strength.

The following sections will discuss in detail about grade Ti 15V 3Cr 3Al 3Sn alloy.

Chemical Composition

The chemical composition of grade Ti 15V 3Cr 3Al 3Sn alloy is outlined in the following table.

Element Content (%)
Titanium, Ti 76
Vanadium, V 15
Aluminum, Al 3
Tin, Sn 3
Chromium, Cr 3

Physical Properties

The physical properties of grade Ti 15V 3Cr 3Al 3Sn alloy are tabulated below.

Properties Metric Imperial
Density 4.76 g/cm3 0.172 lb/in3

Mechanical Properties

The following table shows mechanical properties of grade Ti 15V 3Cr 3Al 3Sn alloy.

Properties Metric Imperial
Tensile strength 790 MPa 115000 psi
Yield strength 770 MPa 112000 psi
Poisson’s ratio 0.33 0.33
Elastic modulus 82.0 GPa 11900 ksi
Shear modulus 30.8 GPa 4470 ksi
Elongation at break 22% 22%
Hardness, Rockwell B 95 95

Thermal Properties

The thermal properties of grade Ti 15V 3Cr 3Al 3Sn are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 8.50 µm/m°C 4.72 µin/in°F
Thermal conductivity 8.08 W/mK 56.1 BTU in/hr.ft².°F

Other Designations

Equivalent material to grade Ti 15V 3Cr 3Al 3Sn alloy is AMS 4914.

Fabrication and Heat Treatment

Machinability

Grade Ti 15V 3Cr 3Al 3Sn 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 15V 3Cr 3Al 3Sn alloy can be hot or cold formed. Cold forming is easy to perform. It is strip-producible.

Welding

Weldability of grade Ti 15V 3Cr 3Al 3Sn alloy is rated as good.

Annealing

Full annealing of this material can be performed by soaking at 792°C (1450°F) and then air cooled. The material can be stress relieved at 538-649°C (1000-1200°F).

Forging

Rough forging can be performed at 982-1093°C (1800-2000°F) and completed at 816-927°C (1500-1700°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.

Aging

Grade Ti 15V 3Cr 3Al 3Sn alloy can be aged at 538°C (1000°F) for 8 h and air cooled.

Applications

Grade Ti 15V 3Cr 3Al 3Sn alloy was primarily developed for airframe applications.

The other application areas include:

  • Aerospace fasteners
  • Tubing and tankage components
  • Flat-rolled products
  • Foil, plate, castings and forgings.

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