TZM Alloy Plate Hot Rolling

Hot rolling is kind of roughing, whose main role is to make the alloy blank shaping, broadened and extended. Molybdenum has high thermal conductivity which can be quickly cooled in the air, so molybdenum plate can’t insulation and after cogging molybdenum plate blank should be heated, namely hot rolling. TZM alloy plate hot rolling temperature is higher than molybdenum plate, usually selected 1400 ℃as  hot rolling starting temperature, 50 minutes for heating time. Besides, during heating should employ uniform annealing process to alloy plate.

Hot rolling reduction is one of the important factors affecting the hot rolling process. In the hot rolling process, in order to improve alloy plate’s productivity and achieve uniform deformation should carry larger amount of reduction and increase passes. If the passes are small, the deformation does not get to the middle of the alloy plate, causing uneven deformation, resulting in alloy slab stratification.

In the hot rolling process, not only should consider the hot rolling reduction, but also consider the hot rolling finished temperature. The test found that the finished temperature have a greater impact on the organization and performance of the alloy plate, thereby affecting the performance of the finished product. When the finished temperature is higher than recrystallization temperature the grains along the machine deformation direction has some stretch, but the grain is coarse and in some areas shows equiaxed crystal phase. When finished rolling temperature is lower, the alloy plate shows smaller longitudinal axis compressed grain structure. This is mainly because molybdenum has higher stacking fault energy, so at high temperature deformation it is prone to slip and climb, while at the same time on the deformation took place dynamic recovery. Suitable finished temperature makes the alloy plate at high temperature recovery state, which is conductive to warm rolling. TZM alloy plate recrystallization temperature is higher than pure molybdenum, so the finished rolling temperature is generally higher than the pure molybdenum finished temperature about 200 ℃, and its finishing temperature is about 1200 ℃.

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