面向梯度温度场的钛合金盘坯加热试验研究

Aiming at a gradient temperature field, a heating experimental scheme with local thermal protection for a scaled titanium alloy disc-type billet was designed, and the change of temperature gradient was determined by the temperature difference between the edge, the transition zone and the center of the sample. The two heating approaches, namely discordant heating and synchronous heating were compared. It is found that the approach of discordant heating can obtain a more obvious temperature gradient. Furthermore, the significant process parameters affecting temperature gradient distribution of titanium alloy disc-type billet were analyzed. When the geometric factors are certain, that is, the size and shape of the sample remain unchanged, the discordant heating temperature has a significant influence on the temperature difference between the edge and the center of the sample. The higher the discordant heating temperature is, the more obvious the temperature gradient is. It is found that the larger the sample size is, the larger the temperature gradient is; the increase of heat transfer area and furnace temperature results in the increase of the temperature difference between the furnace and the disc-type sample, then leads to the decrease of the heat transfer coefficient.