Advanced Rolling Techniques for Molybdenum Sheets

Molybdenum, a refractory metal, is known for its exceptional strength, high melting point, and resistance to corrosion. These properties make molybdenum sheets highly suitable for use in extreme environments, such as high-temperature applications and corrosive media. However, achieving the desired properties in molybdenum sheets often requires advanced rolling techniques. This article aims to explore the latest rolling methods used in the production of molybdenum sheets.

1.Rolling Principles

Rolling is a deformation process that involves passing a metal sheet between two rotating rolls to reduce its thickness and increase its width. The process is used to obtain sheets with the desired thickness and surface finish. In the case of molybdenum, rolling techniques must consider the metal’s high strength and low ductility.

2.Advanced Rolling Techniques

1)Hot Rolling: Hot rolling is a common technique used to process molybdenum sheets. It involves heating the metal to a temperature above its recrystallization temperature, which allows for easier deformation. Hot rolling can effectively reduce the thickness of molybdenum sheets while maintaining good mechanical properties.
2)Cold Rolling: Cold rolling is performed at room temperature or below. It is commonly used to further reduce the thickness of molybdenum sheets obtained through hot rolling. Cold rolling enhances the mechanical properties of the metal, such as strength and hardness, but it requires careful control of the rolling parameters to avoid cracking.
3)Warm Rolling: Warm rolling is a technique that falls between hot and cold rolling. It involves rolling the metal at elevated temperatures but below the recrystallization temperature. Warm rolling combines the advantages of both hot and cold rolling, allowing for better control of the deformation process and improved mechanical properties.
4)Multi-pass Rolling: Multi-pass rolling involves dividing the rolling process into multiple passes, with intermediate annealing steps. This technique reduces the stress accumulated during rolling, allowing for more uniform deformation and improved surface finish.
5)Asymmetric Rolling: Asymmetric rolling is a technique that involves using rolls with different diameters or surface speeds. This approach allows for more controlled deformation, resulting in sheets with better mechanical properties and thickness uniformity.

3.Surface Finishing

After rolling, the surface finish of molybdenum sheets is often improved through various techniques such as polishing, grinding, or etching. These processes remove surface imperfections and enhance the appearance of the sheets.

Advanced rolling techniques play a crucial role in the production of molybdenum sheets with desired properties. By combining different rolling methods and optimizing rolling parameters, manufacturers can achieve sheets with excellent mechanical properties, thickness uniformity, and surface finish. With continuous research and development, new rolling techniques are expected to further enhance the performance of molybdenum sheets in various applications.