Molybdenum Plate High Vs. Low Rolling Temperatures

—Comparing Initial Rolling Temperature Differences on Moly Plate Properties

Molybdenum plate production and quality are guided by numerous factors, among the most critical of which is the initial rolling temperature of molybdenum billets. This temperature point is a key determinant of structural and mechanical properties and performance of the final moly plates. Common plate-forming methods such as hot forging and high-temperature rolling are effective but often result in large grain sizes, uneven microstructures, and suboptimal mechanical properties. In contrast, low-temperature processing produces a finished plate with better plasticity, strength, and elongation rates.


Impact of Molybdenum Plate Rolling Temperatures on Microstructure

Molybdenum, with its body-centered, cubic crystalline structure, maintains a relatively steady grain shape during deformation. Yet, the initial rolling temperature can significantly influence molybdenum grain fragmentation. Higher initial temperature rolling can result in a coarse and shortened grain fibrous and presents indicative of substantial fragmentation. Conversely, lower initial temperature rolling produces a fibrous microstructure of overlapping, elongated grains, resulting in less fragmentation and minimal shifts in grain size and distribution.


Effects of Molybdenum Plate Rolling Temperatures on Mechanical Properties

Molybdenum plates produced by either high or low-temperature rolling exhibit similar strengths; both methods achieve peak strength when the annealing temperature reaches 850℃. Yet there is ample evidence that low-temperature rolling results in superior performance, particularly under high-temperature working conditions.

For example, the low-temperature process imparts a notably higher elongation rate—40% higher than the hot-temperature method in both the longitudinal and transverse directions. Moreover, as the annealing temperature increases beyond 850℃, the strength and elongation rate of high-temperature rolled plates decline sharply.

Overall, the initial temperature used for rolling molybdenum billets plays a key role in determining both the preliminary microstructure and mechanical attributes of the final molybdenum plate. The low-temperature rolling of the molybdenum plate offers greater potential for improved grain structure and better mechanical performance, positioning it as a viable alternative to the traditional high-temperature rolling method.