1. What are the characteristics of titanium alloy hot rolling?
Hot rolling generally refers to the rolling process of metals above the recrystallization temperature. In the process of hot rolling, there are two processes of hardening and softening of deformed metal at the same time. If the recovery and recrystallization softening process are too late, due to the influence of the deformation speed, the metal will have a certain degree of work hardening as the degree of deformation increases. However, in the hot rolling temperature range, the softening process plays a major role. Therefore, at the end of hot rolling, the metal recrystallization process is usually incomplete, and the hot-rolled plate and strip show the coexistence of recrystallization and deformation. It is generally believed that the metal has no work hardening during the hot rolling process, and the plasticity is higher, and the deformation resistance is lower so that larger plastic deformation can be obtained with less energy.
Box type resistance heating furnace
2. What are the advantages of hot rolling?
(1) Hot rolling can significantly reduce energy consumption and reduce costs. Generally, as the temperature increases, the deformation resistance of the metal decreases. Therefore, the deformation resistance of the metal during hot rolling is lower than that during cold processing, which can significantly reduce the energy consumption during rolling. Therefore, all products that can be hot-rolled and billeted should be hot-rolled.
(2) Hot rolling can improve the processing performance of metals and alloys. Because hot rolling can break the coarse grains in the as-cast state, heal micro-cracks, reduce or eliminate casting defects, hot rolling can transform the low-plastic as-cast structure into a deformed structure (processed structure) with higher plasticity, and improve the metal The processing technology performance.
(3) Hot rolling can adopt large reduction rolling. In a certain temperature range, as the temperature increases, the plasticity of the metal increases, so that a larger amount of deformation can be used for rolling, at the same time, it can also reduce the crack defects of the metal and increase the yield of the metal.
(4) Hot rolling can be applied to the rolling of large ingots. Since the metal has higher plasticity and smaller deformation resistance during hot rolling, larger ingots can be used. It can not only increase productivity, yield, and rolling speed but also create conditions for the continuity and automation of the rolling process.
3. What are the disadvantages of hot rolling?
(1) It is difficult to precisely control the mechanical properties of hot rolled products, the structure and performance of hot rolled products are not uniform enough, the strength of hot rolled products is low, and the range of performance fluctuations is large.
(2) The size of hot-rolled products is difficult to accurately control, and the surface is rougher than that of cold-rolled products. The surface quality is not high due to easy oxidation at high temperatures. Therefore, in the production of non-ferrous metal sheets and strips, hot rolling rarely directly produces finished products, and most of them provide blanks for cold rolling.
