Comprehensive Guide to Molybdenum Plate Stretching Technology

Molybdenum, with its unique combination of properties like high melting point, corrosion resistance, and excellent tensile strength, finds application in various industries such as aerospace, defense, and nuclear energy. Stretching molybdenum plates is a critical process that helps enhance their mechanical properties, ensuring their reliability and longevity in demanding applications. This guide provides a comprehensive overview of the various methods and considerations involved in stretching molybdenum plates.

Methods of Stretching Molybdenum Plates:

  1. Hot Stretching:

    • In this method, the molybdenum plate is heated to a temperature just below its recrystallization temperature.
    • It is then stretched using a mechanical force to induce plastic deformation.
    • The hot stretching process allows for more uniform deformation across the plate, resulting in improved mechanical properties.
  2. Cold Stretching:

    • This method involves stretching the molybdenum plate at room temperature without heating it.
    • It is typically done using dies or rolls to apply tension and induce plastic deformation.
    • Cold stretching can lead to grain refinement and improved tensile strength but may result in uneven deformation.
  3. Electrochemical Stretching:

    • This method utilizes an electrochemical process to stretch the molybdenum plate.
    • It involves passing an electrical current through the plate while applying a tensile force.
    • Electrochemical stretching can achieve uniform deformation with minimal material loss and is suitable for complex shapes.
  4. Hydrostatic Stretching:

    • In this method, the molybdenum plate is placed in a high-pressure fluid environment.
    • Hydrostatic pressure is applied, causing the plate to stretch uniformly in all directions.
    • This technique is suitable for large and thin-walled components, providing excellent control over deformation.
  5. Thermal-Assisted Stretching:

    • This method combines heating and mechanical stretching to achieve controlled deformation.
    • The molybdenum plate is heated to a specific temperature range and then stretched using dies or rolls.
    • Thermal-assisted stretching can enhance the ductility and tensile strength of the material.

Considerations for Stretching Molybdenum Plates:

  1. Temperature Control:

    • The temperature at which stretching is performed is crucial. Too high a temperature may cause recrystallization, while too low a temperature may result in uneven deformation.
  2. Mechanical Properties:

    • The final mechanical properties of the stretched molybdenum plate depend on the process parameters, such as the stretching rate, temperature, and strain applied.
  3. Surface Condition:

    • The surface finish and condition before stretching affect the uniformity of deformation and subsequent properties. Ensure cleanliness and proper preparation of the surface before stretching.