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Molybdenum and TZM Alloy Plastic Processing

When stress of the metal exceeds the elastic limit, there will have plastic deformation occurs. Adjacent atomic planes have relative tangential motion. Besides, when the shear stress is large enough, the atomic will from the equilibrium position go into another equilibrium position. But when the external force disappear the atomic planes which after tangential motion can not move back to the original position, thus producing irreversible permanent deformation, that is, plastic processing.

Deformation resistance refers to a kind of ability for resistance plastic deformation. The metal material in order to maintain the original state, there will produce deformation resistance to resist deformation at certain of temperature, speed and deformation degree. From the microscopic point, the external forces make the distance between atoms to change resulting in an imbalance of attraction and repulsion. Molybdenum and TZM alloy in the rolling process will produce deformation resistance, and the main factors which influence the deformation resistance is material chemical composition, metallurgical properties, geometry, friction of deformation outer zone, material work hardening and the deformation zone of thermodynamic parameters.

Molybdenum and TZM alloy plastic processing method mainly includes rolling, extrusion, drawing, stamping, forging, die forging and the equipments include used include rolling mill, extrusion machines, stretching machines, punching machine, forging machines and rolling machine and so on. Molybdenum and TZM alloy only through plastic processing can obtain the desired shape such as wire, strip, rods, tubes and other products with customized shapes and can apply to different areas as well. The main plastic processing method of TZM or molybdenum rod is rolling and model rolling. On the other hand, the wire and tubes usually through stretching machine to produce, and the products of sheet, strip and foil mainly through rolling method.

Using rolling method for material plastic processing mainly puts metal blank in the gap of a pair of rotating rollers (the desired shape), through the compression of rotating rollers to decrease cross-section and to increase the length of the material, then to obtain high quality products. Rolling method is mainly used for the production of bar, sheet and tube. Using rolling mill can obtain good quality product, having low metal burning rate, high productivity, high degree of mechanization, and therefore it is widely used. Rolling can be divided into cold rolling and hot rolling.

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