Molybdenum News Center

TZM Alloy Plate Warm Rolling

TZM alloy plate after hot rolling, the fiber streamline structure has not yet formed. After hot rolling, manufacturers to carry out warm rolling process on TZM alloy plate can greatly improve the finished products rate. TZM alloy plastic-brittle transition temperature is closely related to the rolling temperature. Warm rolling is processing at the temperature which is under recrystallization, temperature and above ductility-brittle transition temperature. The warn rolling of molybdenum plate is generally processing under recrystallization temperature and above room temperature, having wide range. The molybdenum plate after rolling the fibrous tissue always is fibrous deformation tissue and there is a certain degree of work hardening. With the thinning of the molybdenum plate thickness, the rolling temperature should be gradually reduced. This is because as the deformation increase, the recrystallization temperature is decreased and molybdenum plate is very sensitive to the deformation temperature, so at a high temperature in a short time can produce recrystallization, and therefore the rolling temperature must be decreased. Compared to pure molybdenum, TZM alloy has higher recrystallization temperature, thus rolling temperature range is wider and it warm rolling temperature is about 1050 ℃. In warm rolling process, the amount of finish will reduce molybdenum and TZM alloy plastic - brittle transition temperature, improved low temperature ductility, and therefore the amount of deformation pass of warm rolling can not be too small, generally greater than 20%. Further, since the warm rolling temperature of the alloy plate has high heating temperature, after first heating the whole rolling deformation should not be too large, generally controlled at 20% to 30%, rolling passes generally not more than three times.

TZM alloy plate after high-temperature processing, there is low melting point volatile MoO3, molybdenum oxide particles and other pollutants on the surface of alloy. If you continue processing these pollutants will be pressed into the plate, causing defects on alloy plate surface. Therefore, in the rolling process requires an intermediate washing step. TZM alloy plate cleaning usually selected caustic fusion method.

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