Molybdenum - Mechanical Properties And Material ...

Want more information on Lanthanated Molybdenum Alloy? Feel free to contact us.

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Thermal Properties
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Annealing
Applications

Introduction

Molybdenum, a refractory metal is widely used as an alloying element. Due to its good thermal and electrical conductivity, high melting point and excellent strength at elevated temperatures, molybdenum can be used for various applications in its pure form. In addition, molybdenum has low thermal expansion coefficient. It has to be protected by a suitable coating to withstand temperatures above 500°C under an oxidizing environment.

The following section will explain in detail about molybdenum.

Chemical Composition

The following table shows the chemical composition of molybdenum.

Element Content (%) Molybdenum, Mo 100

Physical Properties

The physical properties of molybdenum are outlined in the following table.

Properties Metric Imperial Density 10.3 g/cm³ 0.369 lb/in³ Melting point 2625°C 4760°F

Mechanical Properties

The mechanical properties of molybdenum are outlined in the following table.

Properties Metric Imperial Tensile strength (annealed) 324 MPa 47000 psi Shear strength (torsional strain rate 0.25/s) 500 MPa 72500 psi Compressive yield strength (0.01% yield) 400 MPa 58000 psi Modulus of elasticity 330 GPa 47900 ksi Modulus of elasticity at elevated temperature (@2000°C/3630°F) 160 GPa 23200 ksi Poissons ratio (calculated) 0.38 0.38 Hardness, Brinell (converted from Vickers for 3000 kg load/10 mm ball Brinell test. annealed) 225 225 Hardness, Rockwell A (converted from Vickers. annealed) 60 60 Hardness, Rockwell B (converted from Vickers. annealed) 98 98 Hardness, Rockwell C (converted from Vickers. annealed) 19 19 Hardness, Vickers (annealed) 230 230

Other Designations

Other designations that are equivalent to molybdenum include the following:

• ASTM B386
• ASTM B387

Thermal Properties

The thermal properties of molybdenum are outlined in the following table.

If you are looking for more details, kindly visit Moly-Reo Alloy.

Properties Metric Imperial Thermal expansion coefficient (@20°C/68°F) 5.35 µm/m°C 2.97 µin/in°F Thermal conductivity 138 W/mK 958 BTU in/hr.ft².°F

Fabrication and Heat Treatment

Machinability

Machining molybdenum is similar to that of cast iron. Molybdenum tends to tear if positive feeds are not employed.

Forming

Molybdenum can be efficiently formed while bending in a transverse direction or against rolling or grain direction. The workpiece can be heated before forming to avoid cracking.

Welding

Molybdenum can be welded using electron beam methods and other resistance methods in helium or argon atmosphere.

Annealing

Annealing of molybdenum can be performed at 1149°C (2100°F).

Applications

The following are the major applications of molybdenum:

• Heating elements in furnaces
• Filament supports in electric lamps
• Heat shields
• Hearth trays, plates and racks
• Missile and aircraft parts
• Boring bars
• Thermocouples
• Nuclear energy applications

Molybdenum: Properties

Molybdenum belongs to the group of metals with a high melting point (also called refractory metals). Refractory metals are metals that have a higher melting point than platinum (1772 °C). In refractory metals, the binding energy between the individual atoms is particularly high. Refractory metals are also characterized by a high melting point coupled with a low vapor pressure, good high-temperature stability and in the case of molybdenum- and tungsten-based materials, a very high modulus of elasticity. They are also typically characterized by a low coefficient of thermal expansion and relatively high density. The fact that molybdenum belongs to the same group as tungsten in the periodic table means that it has similar physical and chemical properties. The excellent thermal conductivity of both molybdenum and tungsten is also of particular interest. However, molybdenum is easily deformable even at quite low temperatures and is therefore simpler to work than tungsten. Molybdenum is a genuine all-rounder with a very well-balanced range of properties.

We are able to influence the properties of our molybdenum and its alloys by varying the type and quantity of alloying elements that we add as well as by using a tailor-made production process. The carbides that we specifically include in our TZM and MHC materials modulate the mechanical properties of molybdenum across all temperature ranges. In particular, oxides increase the recrystallization temperature and creep resistance of the molybdenum. Rhenium makes molybdenum ductile even at room temperature. Copper increases the thermal conductivity without having any serious effects on the coefficient of thermal expansion.

Contact us to discuss your requirements of Commercially Pure Titanium Grades. Our experienced sales team can help you identify the options that best suit your needs.