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Mosten Alloy Co., Ltd.

Mechanical properties of molybdenum plate

  • Mosten
  • 16 Sep

The tensile strength, yield strength and elongation of 0.5mm thick molybdenum plate annealed by different processes were measured by shear tensile test on electronic universal tensile testing machine (see table).

0.5mm Mechanical properties of molybdenum plate
Technology Tensile Strength/MPa Yield Strength /MPa Elongation/%
30%~35% Finish rolling temperature 1000℃ 965 658 10.5
35%~40% Finish rolling temperature 1000C 980 695 11.2
30%~35% Finish rolling temperature 1100℃ 958 648 9.8
35%~40% Finish rolling temperature 1100℃ 945 667 8.6

After the same annealing process (850℃x60min), the comparison results of four cross processes are that the deformation rate of 35% ~ 40% and the final rolling temperature of 1000 ℃ are selected. The mechanical properties of molybdenum plate rolled by rolling process are superior, and the tensile strength and yield strength elongation are significantly improved. In addition, the surface quality of molybdenum plate is greatly improved and the peeling surface cracks are greatly reduced. This is because the large deformation not only makes the internal deformation of molybdenum billet uniform, so that it will not produce delamination and cracking in the subsequent processing;In addition, the closed hole and air hole in molybdenum billet will be closed by rolling. The final rolling temperature of molybdenum slab. The results show that the final rolling temperature (i.e. slab temperature) has a great influence on the microstructure and properties of the slab, and then affects the properties of the finished plate. When the final rolling temperature is very high (exceeding the recrystallization temperature of the slab), the grains of the rolled slab are very coarse, and equiaxed grains are easy to appear in some areas, although there is a certain stretch along the deformation direction. On the contrary, when finishing rolling at a lower temperature, the slab has a finer flattening structure along the longitudinal axis, which is due to the higher stacking fault energy of molybdenum and deformation at high temperature, which is very easy to produce cross slip, climbing and node debonding, and dynamic recovery will occur at the same time of deformation. The final rolled slab at a suitable temperature is in a high temperature recovery state, which provides a good foundation for subsequent warm rolling and cold rolling.